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US20100240903A1 - Crystalline tripeptide epoxy ketone protease inhibitors - Google Patents

Crystalline tripeptide epoxy ketone protease inhibitors Download PDF

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US20100240903A1
US20100240903A1 US12/728,547 US72854710A US2010240903A1 US 20100240903 A1 US20100240903 A1 US 20100240903A1 US 72854710 A US72854710 A US 72854710A US 2010240903 A1 US2010240903 A1 US 2010240903A1
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Pasit Phiasivongsa
Louis C. Sehl
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Onyx Therapeutics Inc
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    • C07K5/04—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing only normal peptide links
    • C07K5/08—Tripeptides
    • C07K5/0802—Tripeptides with the first amino acid being neutral
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    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/33—Heterocyclic compounds
    • A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
    • A61K31/41—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with two or more ring hetero atoms, at least one of which being nitrogen, e.g. tetrazole
    • A61K31/425—Thiazoles
    • A61K31/427—Thiazoles not condensed and containing further heterocyclic rings
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    • A61P9/10—Drugs for disorders of the cardiovascular system for treating ischaemic or atherosclerotic diseases, e.g. antianginal drugs, coronary vasodilators, drugs for myocardial infarction, retinopathy, cerebrovascula insufficiency, renal arteriosclerosis
    • C—CHEMISTRY; METALLURGY
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    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D277/00—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings
    • C07D277/02—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings
    • C07D277/20—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
    • C07D277/32—Heterocyclic compounds containing 1,3-thiazole or hydrogenated 1,3-thiazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
    • C07D277/56—Carbon atoms having three bonds to hetero atoms with at the most one bond to halogen
    • C—CHEMISTRY; METALLURGY
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    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D417/00—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00
    • C07D417/02—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings
    • C07D417/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
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    • C07K—PEPTIDES
    • C07K1/00—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length
    • C07K1/02—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length in solution
    • C07K1/026—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length in solution by fragment condensation in solution
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K5/00—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof
    • C07K5/04—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing only normal peptide links
    • C07K5/08—Tripeptides
    • C07K5/0802—Tripeptides with the first amino acid being neutral
    • C07K5/0804—Tripeptides with the first amino acid being neutral and aliphatic
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K5/00—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof
    • C07K5/04—Peptides containing up to four amino acids in a fully defined sequence; Derivatives thereof containing only normal peptide links
    • C07K5/08—Tripeptides
    • C07K5/0821—Tripeptides with the first amino acid being heterocyclic, e.g. His, Pro, Trp
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/30—Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change

Definitions

  • proteasome-mediated degradation In eukaryotes, protein degradation is predominately mediated through the ubiquitin pathway in which proteins targeted for destruction are ligated to the 76 amino acid polypeptide ubiquitin. Once targeted, ubiquitinated proteins then serve as substrates for the 26S proteasome, a multicatalytic protease, which cleaves proteins into short peptides through the action of its three major proteolytic activities. While having a general function in intracellular protein turnover, proteasome-mediated degradation also plays a key role in many processes such as major histocompatibility complex (MHC) class I antigen presentation, apoptosis, cell growth regulation, NF- ⁇ B activation, antigen processing, and transduction of pro-inflammatory signals.
  • MHC major histocompatibility complex
  • the 20S proteasome is a 700 kDa cylindrical-shaped multicatalytic protease complex comprised of 28 subunits organized into four rings. In yeast and other eukaryotes, 7 different ⁇ subunits form the outer rings and 7 different ⁇ subunits comprise the inner rings. The ⁇ subunits serve as binding sites for the 19S (PA700) and 11S (PA28) regulatory complexes, as well as a physical barrier for the inner proteolytic chamber formed by the two ⁇ subunit rings. Thus, in vivo, the proteasome is believed to exist as a 26S particle (“the 26S proteasome”). In vivo experiments have shown that inhibition of the 20S form of the proteasome can be readily correlated to inhibition of 26S proteasome.
  • N-terminal nucleophile hydrolases where the nucleophilic N-terminal residue is, for example, Cys, Ser, Thr, and other nucleophilic moieties.
  • This family includes, for example, penicillin G acylase (PGA), penicillin V acylase (PVA), glutamine PRPP amidotransferase (GAT), and bacterial glycosylasparaginase.
  • proteolytic activities have been defined for the eukaryote 20S proteasome: chymotrypsin-like activity (CT-L), which cleaves after large hydrophobic residues; trypsin-like activity (T-L), which cleaves after basic residues; and peptidylglutamyl peptide hydrolyzing activity (PGPH), which cleaves after acidic residues.
  • C-L chymotrypsin-like activity
  • T-L trypsin-like activity
  • PGPH peptidylglutamyl peptide hydrolyzing activity
  • Two additional less characterized activities have also been ascribed to the proteasome: BrAAP activity, which cleaves after branched-chain amino acids; and SNAAP activity, which cleaves after small neutral amino acids.
  • the major proteasome proteolytic activities appear to be contributed by different catalytic sites, since inhibitors, point mutations in ⁇ subunits and the exchange of ⁇ interferon-inducing ⁇ subunits
  • One aspect of the invention relates to crystalline compounds having a structure of Formula (I) or a pharmaceutically acceptable salt thereof,
  • X is O, NH, or N-alkyl, preferably O;
  • Y is N, S, or C(R 8 ) 2 , preferably NH;
  • Z is NH, N-alkyl, O, S or C(R 8 ) 2 , preferably S;
  • R 1 , R 2 , and R 3 are hydrogen
  • FIG. 1 shows a DSC (differential scanning calorimetry) thermogram of crystalline compound 1.
  • FIG. 2 shows an XRPD (X-ray powder diffraction) pattern of crystalline compound 1.
  • FIG. 3 shows a TG thermogram of crystalline compound 1.
  • FIG. 4 shows modulated thermograms of amorphous compound 1, reversing heat flow (bottom) and non-reversing heat flow (top).
  • FIG. 5 shows a comparison of DSC thermograms of crystalline compound 1 prepared according to Example 2 (middle), Example 3 (top), and Example 4 (bottom).
  • FIG. 6 shows an XRPD pattern of amorphous compound 1 prepared according to Example 1 (bottom), as compared to XRPD patterns of crystalline compound 1 prepared according to Example 2 (top), Example 3 (2 nd from bottom), and Example 4 (2 nd from top).
  • FIG. 7 shows a TG thermogram of amorphous compound 1.
  • the invention relates to crystalline compounds having a structure of Formula (I) or a pharmaceutically acceptable salt thereof,
  • X is O, NH, or N-alkyl, preferably O;
  • Y is NH, N-alkyl, O, S, or C(R 8 ) 2 , preferably NH;
  • Z is NH, N-alkyl, O, S or C(R 8 ) 2 , preferably S;
  • R 1 , R 2 , and R 3 are hydrogen
  • the invention relates to a crystalline compound of Formula (II)
  • the invention relates to a method for the preparation of a crystalline compound of Formula (I) or (II), comprising one or more of: (i) preparing the amorphous compound, e.g., according to U.S. patent application Ser. No. 11/595,804; (ii) dissolving the amorphous compound in an organic solvent; (iii) bringing the solution to supersaturation; (iv) isolating the crystals, e.g., by filtering the crystals, by decanting fluid from the crystals, or by any other suitable separation technique; and (v) washing the crystals.
  • preparation further comprises inducing crystallization.
  • preparation further comprises drying, preferably under reduced pressure, such as under vacuum pressure.
  • the amorphous compound may be dissolved in a solvent selected from acetonitrile, ethyl acetate, heptanes, hexanes, isopropyl acetate, methanol, methylethyl ketone, tetrahydrofuran, toluene, and water, or any combination thereof.
  • the amorphous compound of Formula (II) may be dissolved in an organic solvent selected from acetonitrile, heptanes, hexanes, methanol, tetrahydrofuran, and toluene, or any combination thereof.
  • the organic solvent is toluene, tetrahydrofuran, or acetonitrile, preferably acetonitrile or toluene.
  • bringing the solution to supersaturation comprises the slow addition of an anti-solvent, such as water, heptanes, hexanes or another polar or non-polar liquid miscible with the organic solvent, allowing the solution to cool (with or without seeding the solution), reducing the volume of the solution, or any combination thereof.
  • bringing the solution to supersaturation comprises adding an anti-solvent, cooling the solution to ambient temperature or lower, and reducing the volume of the solution, e.g., by evaporating solvent from the solution.
  • allowing the solution to cool may be passive (e.g., allowing the solution to stand at ambient temperature) or active (e.g., cooling the solution in an ice bath or freezer).
  • the method further comprises inducing precipitation or crystallization.
  • inducing precipitation or crystallization comprises secondary nucleation, wherein nucleation occurs in the presence of seed crystals or interactions with the environment (crystallizer walls, stirring impellers, sonication, etc.).
  • washing the crystals comprises washing with a liquid selected from anti-solvent, acetonitrile, heptanes, hexanes, methanol, tetrahydrofuran, toluene, water, or a combination thereof.
  • the crystals are washed with a combination of anti-solvent and the organic solvent.
  • the anti-solvent is water, while in other embodiments it is an alkane solvent, such as hexane or pentane, or an aromatic hydrocarbon solvent, such as benzene, toluene, or xylene.
  • washing the crystals comprises washing the crystalline compound of Formula (II) with a mix of tetrahydrofuran and an alkane solvent, such as hexanes or heptanes, or with a mix of acetonitrile and water.
  • washing the crystals comprises washing the crystalline compound of Formula (II) with toluene. In preferred such embodiments, the toluene is cooled prior to washing.
  • a crystalline compound of Formula (II) is substantially pure.
  • the melting point of the crystalline compound of Formula (II) is in the range of about 135 to about 160° C., about 140 to about 155° C., about 145 to about 150° C., or even about 147 to about 149° C., e.g., about 149° C.
  • the DSC of a crystalline compound of Formula (II) has a sharp endothermic maximum at about 147° C., e.g., resulting from melting and decomposition of the crystalline form as shown in FIG. 1 .
  • the X-ray powder pattern of a crystalline compound of Formula (II) is ( ⁇ -2 ⁇ °: 8.94; 9.39; 9.76; 10.60; 11.09; 12.74; 15.27; 17.74; 18.96; 20.58; 20.88; 21.58; 21.78; 22.25; 22.80; 24.25; 24.66; 26.04; 26.44; 28.32; 28.96; 29.65; 30.22; 30.46; 30.78; 32.17; 33.65; 34.49; 35.08; 35.33; 37.85; 38.48 as shown in FIG. 2 .
  • the TG thermogram of a crystalline compound of Formula (II) exhibits from 0.0 to 0.3% weight loss in the temperature range of 25 to 125° C. as shown in FIG. 3 .
  • a crystalline compound of Formula (II) is not solvated (e.g., the crystal lattice does not comprise molecules of a solvent). In certain alternative embodiments, a crystalline compound of Formula (II) is solvated.
  • the invention relates to a method for the preparation of a crystalline compound of Formula (II),
  • a compound of Formula (II) is not purified by chromatography prior to preparation of the solution in the organic solvent.
  • preparation further comprises inducing crystallization. In certain embodiments, preparation further comprises washing the crystals, e.g., with a solvent or non-solvent fluid. In certain embodiments, preparation further comprises drying, preferably under reduced pressure, such as under vacuum pressure.
  • X is a counterion selected from hydrobromide, hydrochloride, sulfate, phosphate, nitrate, acetate, trifluoroacetate, citrate, methanesulfonate, valerate, oleate, palmitate, stearate, laurate, benzoate, lactate, succinate, tosylate, malonate, maleate, fumarate, succinate, tartrate, mesylate, 2-hydroxyethanesulfonate, and the like.
  • a counterion selected from hydrobromide, hydrochloride, sulfate, phosphate, nitrate, acetate, trifluoroacetate, citrate, methanesulfonate, valerate, oleate, palmitate, stearate, laurate, benzoate, lactate, succinate, tosylate, malonate, maleate, fumarate, succinate, tartrate, mesylate, 2-hydroxyethanesulf
  • X is selected from trifluoroacetate, methanesulfonate, toluenesulfonate, acetate, chloride, and bromide, preferably trifluoroacetate.
  • the organic solvent is selected from acetonitrile, ethyl acetate, heptanes, hexanes, isopropyl acetate, methanol, methylethyl ketone, tetrahydrofuran, toluene, and water, or any combination thereof.
  • the amorphous compound of Formula (II) may be dissolved in an organic solvent selected from acetonitrile, heptanes, hexanes, methanol, tetrahydrofuran, and toluene, or any combination thereof.
  • the organic solvent is toluene, tetrahydrofuran, or acetonitrile, preferably acetonitrile or toluene.
  • preparation further comprises washing the crystals of Formula (II).
  • washing the crystals comprises washing with a liquid selected from anti-solvent, acetonitrile, heptanes, hexanes, methanol, tetrahydrofuran, toluene, water, or a combination thereof.
  • the crystals are washed with a combination of anti-solvent and the organic solvent.
  • the anti-solvent is water, while in other embodiments it is an alkane solvent, such as hexane or pentane, or an aromatic hydrocarbon solvent, such as benzene, toluene, or xylene.
  • preparation further comprises drying the crystals of both of Formula (II), preferably under reduced pressure, such as under vacuum pressure.
  • the invention relates to a pharmaceutical composition
  • a pharmaceutical composition comprising a crystalline compound of Formula (II) and a pharmaceutically acceptable carrier.
  • the pharmaceutical composition is selected from tablets, capsules, and injections.
  • proteasome Orderly protein degradation is crucial to the maintenance of normal cell functions, and the proteasome is integral to the protein degradation process.
  • the proteasome controls the levels of proteins that are important for cell-cycle progression and apoptosis in normal and malignant cells; for example, cyclins, caspases, BCL2 and nF-kB (Kumatori et al., Proc. Natl. Acad. Sci. USA (1990) 87:7071-7075; Almond et al., Leukemia (2002) 16: 433-443).
  • inhibiting proteasome activity can translate into therapies to treat various disease states, such as malignant, non-malignant and autoimmune diseases, depending on the cells involved.
  • proteasome inhibition has already been validated as a therapeutic strategy for the treatment of multiple myeloma. This could be due, in part, to the highly proliferative malignant cell's dependency on the proteasome system to rapidly remove proteins (Rolfe et al., J. Mol. Med. (1997) 75:5-17; Adams, Nature (2004) 4: 349-360). Therefore, certain embodiments of the invention relate to a method of treating a cancer, comprising administering to a subject in need of such treatment an effective amount of a proteasome inhibitor compound disclosed herein.
  • cancer includes, but is not limited to, blood borne and solid tumors.
  • Cancer refers to disease of blood, bone, organs, skin tissue and the vascular system, including, but not limited to, cancers of the bladder, blood, bone, brain, breast, cervix, chest, colon, endometrium, esophagus, eye, head, kidney, liver, lung, lymph nodes, mouth, neck, ovaries, pancreas, prostate, rectum, renal, skin, stomach, testis, throat, and uterus.
  • Specific cancers include, but are not limited to, leukemia (acute lymphocytic leukemia (ALL), acute myelogenous leukemia (AML), chronic lymphocytic leukemia (CLL), chronic myelogenous leukemia (CML), hairy cell leukemia), mature B cell neoplasms (small lymphocytic lymphoma, B cell prolymphocytic leukemia, lymphoplasmacytic lymphoma (such as Waldenström's macroglobulinemia), splenic marginal zone lymphoma, plasma cell myeloma, plasmacytoma, monoclonal immunoglobulin deposition diseases, heavy chain diseases, extranodal marginal zone B cell lymphoma (MALT lymphoma), nodal marginal zone B cell lymphoma (NMZL), follicular lymphoma, mantle cell lymphoma, diffuse B cell lymphoma, mediastinal (thymic) large B cell lymphoma, intravascular large
  • CMPDs chronic myeloproliferative diseases
  • CMPDs are clonal haematopoietic stem cell disorders characterized by proliferation in the bone marrow of one or more of the myeloid lineages, resulting in increased numbers of granulocytes, red blood cells and/or platelets in the peripheral blood.
  • proteasome inhibitors for the treatment of such diseases is attractive and being examined (Cilloni et al., Haematologica (2007) 92: 1124-1229).
  • CMPD can include chronic myelogenous leukaemia, chronic neutrophilic leukaemia, chronic eosinophilic leukaemia, polycythaemia vera, chronic idiopathic myelofibrosis, essential thrombocythaemia and unclassifiable chronic myeloproliferative disease.
  • An aspect of the invention is the method of treating CMPD comprising administering to a subject in need of such treatment an effective amount of a proteasome inhibitor compound disclosed herein.
  • Myelodisplastic/myeloproliferative diseases such as chronic myelomonocytic leukaemia, atypical chronic myeloid leukemia, juvenile myelomonocytic leukaemia and unclassifiable myelodysplastic/myeloproliferative disease, are characterized by hypercellularity of the bone marrow due to proliferation in one or more of the myeloid lineages. Inhibiting the proteasome with a compound or composition as described herein can serve to treat these myelodysplatic/myeloproliferative diseases by providing a subject in need of such treatment an effective amount of the compound or composition.
  • MDS Myelodysplastic syndromes
  • NF-kB hematopoietic stem cell disorders characterized by dysplasia and ineffective haematopoiesis in one or more of the major myeloid cell lines.
  • Targeting NF-kB with a proteasome inhibitor in these hematologic malignancies induces apoptosis, thereby killing the malignant cell (Braun et al. Cell Death and Differentiation (2006) 13:748-758).
  • a further embodiment of the invention is a method to treat MDS comprising administering to a subject in need of such treatment an effective amount of a compound disclosed herein.
  • MDS includes refractory anemia, refractory anemia with ringed sideroblasts, refractory cytopenia with multilineage dysplasia, refractory anemia with excess blasts, unclassifiable myelodysplastic syndrome and myelodysplastic syndrome associated with isolated del(5q) chromosome abnormality.
  • Mastocytosis is a proliferation of mast cells and their subsequent accumulation in one or more organ systems.
  • Mastocytosis includes, but is not limited to, cutaneous mastocytosis, indolent systemic mastocytosis (ISM), systemic mastocytosis with associated clonal haematological non-mast-cell-lineage disease (SM-AHNMD), aggressive systemic mastocytosis (ASM), mast cell leukemia (MCL), mast cell sarcoma (MCS) and extracutaneous mastocytoma.
  • Another embodiment of the invention is a method to treat mastocytosis, comprising administering an effective amount of a compound or composition disclosed herein to a subject diagnosed with mastocytosis.
  • NF- ⁇ B The proteasome regulates NF- ⁇ B, which in turn regulates genes involved in the immune and inflammatory response.
  • NF- ⁇ B is required for the expression of the immunoglobulin light chain ⁇ gene, the IL-2 receptor ⁇ -chain gene, the class I major histocompatibility complex gene, and a number of cytokine genes encoding, for example, IL-2, IL-6, granulocyte colony-stimulating factor, and IFN- ⁇ (Palombella et al., Cell (1994) 78:773-785).
  • the invention relates to methods of affecting the level of expression of IL-2, MHC-I, IL-6, TNF ⁇ , IFN- ⁇ or any of the other previously-mentioned proteins, each method comprising administering to a subject an effective amount of a proteasome inhibitor compound or composition disclosed herein.
  • the invention includes a method of treating an autoimmune disease in a mammal comprising administering a therapeutically effective amount of a compound or composition described herein.
  • An “autoimmune disease” herein is a disease or disorder arising from and directed against an individual's own tissues.
  • autoimmune diseases or disorders include, but are not limited to, inflammatory responses such as inflammatory skin diseases including psoriasis and dermatitis (e.g., atopic dermatitis); systemic scleroderma and sclerosis; responses associated with inflammatory bowel disease (such as Crohn's disease and ulcerative colitis); respiratory distress syndrome (including adult respiratory distress syndrome; ARDS); dermatitis; meningitis; encephalitis; uveitis; colitis; glomerulonephritis; allergic conditions such as eczema and asthma and other conditions involving infiltration of T cells and chronic inflammatory responses; atherosclerosis; leukocyte adhesion deficiency; rheumatoid arthritis; systemic lupus erythematosus (SLE); diabetes mellitus (e.g., Type I diabetes mellitus or insulin dependent diabetes mellitis); multiple sclerosis; Reynaud's syndrome; autoimmune thyroiditis; allergic encephalo
  • the invention relates to a method of using the compound as an immunomodulatory agent for inhibiting or altering antigen presentation in a cell, comprising exposing the cell (or administering to a subject) to a compound described herein.
  • a method of treating graft or transplant-related diseases such as graft-versus-host disease or host versus-graft disease in a mammal, comprising administering a therapeutically effective amount of a compound described herein.
  • graft refers to biological material derived from a donor for transplantation into a recipient. Grafts include such diverse material as, for example, isolated cells such as islet cells; tissue such as the amniotic membrane of a newborn, bone marrow, hematopoietic precursor cells, and ocular tissue, such as corneal tissue; and organs such as skin, heart, liver, spleen, pancreas, thyroid lobe, lung, kidney, tubular organs (e.g., intestine, blood vessels, or esophagus). The tubular organs can be used to replace damaged portions of esophagus, blood vessels, or bile duct.
  • isolated cells such as islet cells
  • tissue such as the amniotic membrane of a newborn, bone marrow, hematopoietic precursor cells, and ocular tissue, such as corneal tissue
  • organs such as skin, heart, liver, spleen, pancreas, thyroid lobe, lung, kidney, tubular organs
  • the skin grafts can be used not only for burns, but also as a dressing to damaged intestine or to close certain defects such as diaphragmatic hernia.
  • the graft is derived from any mammalian source, including human, whether from cadavers or living donors. In some cases, the donor and recipient is the same mammal.
  • the graft is bone marrow or an organ such as heart and the donor of the graft and the host are matched for HLA class II antigens.
  • Histiocytic and dendritic cell neoplasms are derived from phagocytes and accessory cells, which have major roles in the processing and presentation of antigens to lymphocytes. Depleting the proteasome content in dendritic cells has been shown to alter their antigen-induced responses (Chapatte et al. Cancer Res. (2006) 66:5461-5468).
  • another embodiment of the invention comprises administering an effective amount of a compound or composition disclosed herein to a subject with histiocytic or dendritic cell neoplasm.
  • Histiocytic and dendritic cell neoplasms include histiocytic sarcoma, Langerhans cell histiocytosis, Langerhans cell sarcoma, interdigitating dendritic cell sarcoma/tumor, follicular dendritic cell sarcoma/tumor and non-specified dendritic cell sarcoma.
  • an embodiment of the invention includes the treatment of lymphoproliferative diseases (LPD) associated with primary immune disorders (PID) comprising administering an effective amount of the disclosed compound to a subject in need thereof.
  • LPD lymphoproliferative diseases
  • PID primary immune disorders
  • lymphoproliferative disorders including B-cell and T-cell neoplasms and lymphomas
  • primary immunodeficiency syndromes and other primary immune disorders infection with the human immunodeficiency virus (HIV), iatrogenic immunosuppression in patients who have received solid organ or bone marrow allografts, and iatrogenic immunosuppression associated with methotrexate treatment.
  • HIV human immunodeficiency virus
  • PIDs commonly associated with LPDs are ataxia telangiectasia (AT), Wiskott-Aldrich syndrome (WAS), common variable immunodeficiency (CVID), severe combined immunodeficiency (SCID), X-linked lymphoproliferative disorder (XLP), Nijmegen breakage syndrome (NBS), hyper-IgM syndrome, and autoimmune lymphoproliferative syndrome (ALPS).
  • AT ataxia telangiectasia
  • WAS Wiskott-Aldrich syndrome
  • CVID common variable immunodeficiency
  • SCID severe combined immunodeficiency
  • XLP X-linked lymphoproliferative disorder
  • NBS Nijmegen breakage syndrome
  • hyper-IgM syndrome and autoimmune lymphoproliferative syndrome
  • Additional embodiments of the invention relate to methods for affecting the proteasome-dependent regulation of oncoproteins and methods of treating or inhibiting cancer growth, each method comprising exposing a cell (in vivo, e.g., in a subject, or in vitro) to the proteasome inhibitor composition disclosed herein.
  • HPV-16 and HPV-18-derived E6 proteins stimulate ATP- and ubiquitin-dependent conjugation and degradation of p53 in crude reticulocyte lysates.
  • the recessive oncogene p53 has been shown to accumulate at the nonpermissive temperature in a cell line with a mutated thermolabile E1. Elevated levels of p53 may lead to apoptosis.
  • the invention relates to a method for treating p53-related apoptosis, comprising administering to a subject an effective amount of a proteasome inhibitor composition disclosed herein.
  • Another aspect of the invention relates to the use of proteasome inhibitor compositions disclosed herein for the treatment of neurodegenerative diseases and conditions, including, but not limited to, stroke, ischemic damage to the nervous system, neural trauma (e.g., percussive brain damage, spinal cord injury, and traumatic damage to the nervous system), multiple sclerosis and other immune-mediated neuropathies (e.g., Guillain-Barre syndrome and its variants, acute motor axonal neuropathy, acute inflammatory demyelinating polyneuropathy, and Fisher Syndrome), HIV/AIDS dementia complex, axonomy, diabetic neuropathy, Parkinson's disease, Huntington's disease, multiple sclerosis, bacterial, parasitic, fungal, and viral meningitis, encephalitis, vascular dementia, multi-infarct dementia, Lewy body dementia, frontal lobe dementia such as Pick's disease, subcortical dementias (such as Huntington or progressive supranuclear palsy), focal cortical atrophy syndromes (such as
  • Alzheimer's disease is characterized by extracellular deposits of ⁇ -amyloid protein ( ⁇ -AP) in senile plaques and cerebral vessels.
  • ⁇ -AP is a peptide fragment of 39 to 42 amino acids derived from an amyloid protein precursor (APP). At least three isoforms of APP are known (695, 751, and 770 amino acids). Alternative splicing of mRNA generates the isoforms; normal processing affects a portion of the ⁇ -AP sequence, thereby preventing the generation of ⁇ -AP. It is believed that abnormal protein processing by the proteasome contributes to the abundance of ⁇ -AP in the Alzheimer brain.
  • the APP-processing enzyme in rats contains about ten different subunits (22 kDa-32 kDa).
  • the 25 kDa subunit has an N-terminal sequence of X-Gln-Asn-Pro-Met-X-Thr-Gly-Thr-Ser, which is identical to the ⁇ -subunit of human macropain (Kojima, S. et al., Fed. Eur. Biochem. Soc ., (1992) 304:57-60).
  • the APP-processing enzyme cleaves at the Gln 15 -Lys 16 bond; in the presence of calcium ion, the enzyme also cleaves at the Met ⁇ 1 -Asp 1 bond and the Asp 1 -Ala 2 bond to release the extracellular domain of ⁇ -AP.
  • One aspect of the invention therefore, relates to a method of treating Alzheimer's disease, comprising administering to a subject an effective amount of a proteasome inhibitor compound or composition disclosed herein.
  • Such treatment includes reducing the rate of ⁇ -AP processing, reducing the rate of ⁇ -AP plaque formation, reducing the rate of ⁇ -AP generation, and reducing the clinical signs of Alzheimer's disease.
  • Fibrosis is the excessive and persistent formation of fibrous connective tissue resulting from the hyperproliferative growth of fibroblasts and is associated with activation of the TGF- ⁇ signaling pathway. Fibrosis involves extensive deposition of extracellular matrix and can occur within virtually any tissue or across several different tissues. Normally, the level of intracellular signaling protein (Smad) that activates transcription of target genes upon TGF- ⁇ stimulation is regulated by proteasome activity (Xu et al., 2000).
  • Smad intracellular signaling protein
  • fibrotic conditions such as cystic fibrosis, injection fibrosis, endomyocardial fibrosis, idiopathic pulmonary fibrosis, myelofibrosis, retroperitoneal fibrosis, progressive massive fibrosis, nephrogenic systemic fibrosis.
  • Other conditions that are often associated with fibrosis include cirrhosis, diffuse parenchymal lung disease, post-vasectomy pain syndrome, tuberculosis, sickle-cell anemia and rheumatoid arthritis.
  • An embodiment of the invention is the method of treating a fibrotic or fibrotic-associated condition comprising administering an effective amount of the composition described herein to a subject in need of such treatment.
  • the invention relates to the topical or systemic administration of a subject inhibitor to treat burns. Wound closure following surgery is often associated with disfiguring scars, which may be prevented by inhibition of fibrosis. Thus, in certain embodiments, the invention relates to a method for the prevention or reduction of scarring.
  • LPS lipopolysaccharide
  • TNF ⁇ lipopolysaccharide
  • the first step in the activation of cells by LPS is the binding of LPS to specific membrane receptors.
  • the ⁇ - and ⁇ -subunits of the 20S proteasome complex have been identified as LPS-binding proteins, suggesting that the LPS-induced signal transduction may be an important therapeutic target in the treatment or prevention of sepsis (Qureshi, N. et al., J. Immun. (2003) 171: 1515-1525). Therefore, in certain embodiments, the proteasome inhibitor composition may be used for the inhibition of TNF ⁇ to prevent and/or treat septic shock.
  • Ischemia and reperfusion injury results in hypoxia, a condition in which there is a deficiency of oxygen reaching the tissues of the body. This condition causes increased degradation of I ⁇ -B ⁇ , thereby resulting in the activation of NF- ⁇ B (Koong et al., 1994). It has been demonstrated that the severity of injury resulting in hypoxia can be reduced with the administration of a proteasome inhibitor (Gao et al., 2000; Bao et al., 2001; Pye et al., 2003). Therefore, certain embodiments of the invention relate to a method of treating an ischemic condition or reperfusion injury comprising administering to a subject in need of such treatment an effective amount of the proteasome inhibitor compound disclosed herein.
  • Such conditions or injuries include, but are not limited to, acute coronary syndrome (vulnerable plaques), arterial occlusive disease (cardiac, cerebral, peripheral arterial and vascular occlusions), atherosclerosis (coronary sclerosis, coronary artery disease), infarctions, heart failure, pancreatitis, myocardial hypertrophy, steno sis, and restenosis.
  • acute coronary syndrome vulnerable plaques
  • arterial occlusive disease cardiac, cerebral, peripheral arterial and vascular occlusions
  • atherosclerosis coronary sclerosis, coronary artery disease
  • infarctions heart failure
  • pancreatitis myocardial hypertrophy
  • steno sis steno sis
  • restenosis examples of such conditions or injuries
  • NF- ⁇ B also binds specifically to the HIV-enhancer/promoter.
  • the HIV regulatory protein Nef of pbj 14 differs by two amino acids in the region which controls protein kinase binding. It is believed that the protein kinase signals the phosphorylation of I ⁇ B, triggering I ⁇ B degradation through the ubiquitin-proteasome pathway. After degradation, NF- ⁇ B is released into the nucleus, thus enhancing the transcription of HIV (Cohen, J., Science , (1995) 267:960).
  • the invention relates to a method for inhibiting or reducing HIV infection in a subject, or a method for decreasing the level of viral gene expression, each method comprising administering to the subject an effective amount of a proteasome inhibitor compound or composition disclosed herein.
  • Viral infections contribute to the pathology of many diseases.
  • Heart conditions such as ongoing myocarditis and dilated cardiomyopathy have been linked to the coxsackievirus B3.
  • specific proteasome subunits were uniformly up-regulated in hearts of mice which developed chronic myocarditis (Szalay et al, Am J Pathol 168:1542-52, 2006).
  • Some viruses utilize the ubiquitin-proteasome system in the viral entry step where the virus is released from the endosome into the cytosol.
  • the mouse hepatitis virus (MHV) belongs to the Coronaviridae family, which also includes the severe acute respiratory syndrome (SARS) coronavirus.
  • the invention relates to a method for treating viral infection, such as SARS or hepatitis A, B, C, D and E, comprising contacting a cell with (or administering to a subject) an effective amount of a compound or composition disclosed herein.
  • the disclosed compositions may be useful for the treatment of a parasitic infection, such as infections caused by protozoan parasites.
  • a parasitic infection such as infections caused by protozoan parasites.
  • the proteasome of these parasites is considered to be involved primarily in cell differentiation and replication activities (Paugam et al., Trends Parasitol. 2003, 19(2): 55-59).
  • entamoeba species have been shown to lose encystation capacity when exposed to proteasome inhibitors (Gonzales, et al., Arch. Med. Res. 1997, 28, Spec No: 139-140).
  • the administrative protocols for the proteasome inhibitor compositions are useful for the treatment of parasitic infections in humans caused by a protozoan parasite selected from Plasmodium sps.
  • Trypanosoma sps. including T. cruzi , which causes Chagas' disease, and T. brucei which causes African sleeping sickness
  • Leishmania sps. including L. amazonesis, L. donovani, L. infantum, L. mexicana , etc.
  • Pneumocystis carinii a protozoan known to cause pneumonia in AIDS and other immunosuppressed patients
  • Toxoplasma gondii Entamoeba histolytica, Entamoeba invadens , and Giardia lamblia .
  • the disclosed proteasome inhibitor compositions are useful for the treatment of parasitic infections in animals and livestock caused by a protozoan parasite selected from Plasmodium hermani, Cryptosporidium sps., Echinococcus granulosus, Eimeria tenella, Sarcocystis neurona , and Neurospora crassa .
  • a protozoan parasite selected from Plasmodium hermani, Cryptosporidium sps., Echinococcus granulosus, Eimeria tenella, Sarcocystis neurona , and Neurospora crassa .
  • Other compounds that act as proteasome inhibitors in the treatment of parasitic diseases are described in WO 98/10779, which is incorporated herein in its entirety.
  • the proteasome inhibitor compositions inhibit proteasome activity in a parasite without recovery in red blood cells and white blood cells.
  • the long half-life of blood cells may provide prolonged protection with regard to therapy against recurring exposures to parasites.
  • the proteasome inhibitor compositions may provide prolonged protection with regard to chemoprophylaxis against future infection.
  • Prokaryotes have an equivalent to the eukaryote 20S proteasome particle. Although the subunit composition of the prokaryote 20S particle is simpler than that of eukaryotes, it has the ability to hydrolyze peptide bonds in a similar manner. For example, the nucleophilic attack on the peptide bond occurs through the threonine residue on the N-terminus of the ⁇ -subunits.
  • an embodiment of this invention relates to a method of treating prokaryotic infections, comprising administering to a subject an effective amount of a proteasome inhibitor compound or composition disclosed herein.
  • Prokaryotic infections may include diseases caused by either mycobacteria (such as tuberculosis, leprosy or Buruli ulcer) or archaebacteria.
  • proteasome inhibitors that bind to the 20S proteasome stimulate bone formation in bone organ cultures. Furthermore, when such inhibitors have been administered systemically to mice, certain proteasome inhibitors increased bone volume and bone formation rates over 70% (Garrett, I. R. et al., J. Clin. Invest . (2003) 111: 1771-1782), therefore suggesting that the ubiquitin-proteasome machinery regulates osteoblast differentiation and bone formation. Therefore, a disclosed proteasome inhibitor compound or composition may be useful in the treatment and/or prevention of diseases associated with bone loss, such as osteoporosis.
  • the invention relates to a method for treating a disease or condition selected from cancer, autoimmune disease, graft or transplant-related condition, neurodegenerative disease, fibrotic-associated condition, ischemic-related conditions, infection (viral, parasitic or prokaryotic) and diseases associated with bone loss, comprising administering a compound or composition as disclosed herein.
  • Compounds prepared as described herein can be administered in various forms, depending on the disorder to be treated and the age, condition, and body weight of the patient, as is well known in the art.
  • the compounds may be formulated as tablets, capsules, granules, powders, or syrups; or for parenteral administration, they may be formulated as injections (intravenous, intramuscular, or subcutaneous), drop infusion preparations, or suppositories.
  • injections intravenous, intramuscular, or subcutaneous
  • drop infusion preparations or suppositories.
  • ophthalmic mucous membrane route they may be formulated as eye drops or eye ointments.
  • the active ingredient may be mixed with any conventional additive or excipient, such as a binder, a disintegrating agent, a lubricant, a corrigent, a solubilizing agent, a suspension aid, an emulsifying agent, a coating agent, a cyclodextrin, and/or a buffer.
  • a daily dosage of from 0.01 to 2000 mg of the compound is recommended for an adult human patient, and this may be administered in a single dose or in divided doses.
  • the amount of active ingredient which can be combined with a carrier material to produce a single dosage form will generally be that amount of the compound which produces a therapeutic effect.
  • the precise time of administration and/or amount of the composition that will yield the most effective results in terms of efficacy of treatment in a given patient will depend upon the activity, pharmacokinetics, and bioavailability of a particular compound, physiological condition of the patient (including age, sex, disease type and stage, general physical condition, responsiveness to a given dosage, and type of medication), route of administration, etc.
  • physiological condition of the patient including age, sex, disease type and stage, general physical condition, responsiveness to a given dosage, and type of medication
  • route of administration etc.
  • the above guidelines can be used as the basis for fine-tuning the treatment, e.g., determining the optimum time and/or amount of administration, which will require no more than routine experimentation consisting of monitoring the subject and adjusting the dosage and/or timing.
  • phrases “pharmaceutically acceptable” is employed herein to refer to those ligands, materials, compositions, and/or dosage forms which are, within the scope of sound medical judgment, suitable for use in contact with the tissues of human beings and animals without excessive toxicity, irritation, allergic response, or other problem or complication, commensurate with a reasonable benefit/risk ratio.
  • pharmaceutically acceptable carrier means a pharmaceutically acceptable material, composition, or vehicle, such as a liquid or solid filler, diluent, excipient, solvent or encapsulating material. Each carrier must be “acceptable” in the sense of being compatible with the other ingredients of the formulation and not injurious to the patient.
  • materials which can serve as pharmaceutically acceptable carriers include: (1) sugars, such as lactose, glucose, and sucrose; (2) starches, such as corn starch, potato starch, and substituted or unsubstituted ⁇ -cyclodextrin; (3) cellulose, and its derivatives, such as sodium carboxymethyl cellulose, ethyl cellulose, and cellulose acetate; (4) powdered tragacanth; (5) malt; (6) gelatin; (7) talc; (8) excipients, such as cocoa butter and suppository waxes; (9) oils, such as peanut oil, cottonseed oil, safflower oil, sesame oil, olive oil, corn oil, and soybean oil; (10) glycols, such as propylene glycol; (11) polyols, such as glycerin, sorbitol, mannitol, and polyethylene glycol; (12) esters, such as ethyl oleate and ethyl laurate;
  • pharmaceutically acceptable salt refers to the relatively non-toxic, inorganic and organic acid addition salts of the inhibitor(s). These salts can be prepared in situ during the final isolation and purification of the inhibitor(s), or by separately reacting a purified inhibitor(s) in its free base form with a suitable organic or inorganic acid, and isolating the salt thus formed.
  • Representative salts include the hydrobromide, hydrochloride, sulfate, bisulfate, phosphate, nitrate, acetate, valerate, oleate, palmitate, stearate, laurate, benzoate, lactate, phosphate, tosylate, citrate, maleate, fumarate, succinate, tartrate, naphthylate, mesylate, glucoheptonate, lactobionate, laurylsulphonate salts, and amino acid salts, and the like.
  • sulfate bisulfate
  • phosphate nitrate
  • acetate valerate
  • oleate palmitate
  • stearate laurate
  • benzoate lactate
  • phosphate tosylate
  • citrate maleate
  • fumarate succinate
  • tartrate naphthylate
  • mesylate glucoheptonate
  • lactobionate lactobionate
  • laurylsulphonate salts
  • the inhibitors useful in the methods of the present invention may contain one or more acidic functional groups and, thus, are capable of forming pharmaceutically acceptable salts with pharmaceutically acceptable bases.
  • pharmaceutically acceptable salts refers to the relatively non-toxic inorganic and organic base addition salts of an inhibitor(s). These salts can likewise be prepared in situ during the final isolation and purification of the inhibitor(s), or by separately reacting the purified inhibitor(s) in its free acid form with a suitable base, such as the hydroxide, carbonate, or bicarbonate of a pharmaceutically acceptable metal cation, with ammonia, or with a pharmaceutically acceptable organic primary, secondary, or tertiary amine.
  • Representative alkali or alkaline earth salts include the lithium, sodium, potassium, calcium, magnesium, and aluminum salts, and the like.
  • Representative organic amines useful for the formation of base addition salts include ethylamine, diethylamine, ethylenediamine, ethanolamine, diethanolamine, piperazine, and the like (see, for example, Berge et al., supra).
  • wetting agents such as sodium lauryl sulfate and magnesium stearate, as well as coloring agents, release agents, coating agents, sweetening, flavoring, and perfuming agents, preservatives and antioxidants can also be present in the compositions.
  • antioxidants examples include: (1) water soluble antioxidants, such as ascorbic acid, cysteine hydrochloride, sodium bisulfate, sodium metabisulfite, sodium sulfite, and the like; (2) oil-soluble antioxidants, such as ascorbyl palmitate, butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), lecithin, propyl gallate, alpha-tocopherol, and the like; and (3) metal chelating agents, such as citric acid, ethylenediamine tetraacetic acid (EDTA), sorbitol, tartaric acid, phosphoric acid, and the like.
  • water soluble antioxidants such as ascorbic acid, cysteine hydrochloride, sodium bisulfate, sodium metabisulfite, sodium sulfite, and the like
  • oil-soluble antioxidants such as ascorbyl palmitate, butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT
  • Formulations suitable for oral administration may be in the form of capsules, cachets, pills, tablets, lozenges (using a flavored basis, usually sucrose and acacia or tragacanth), powders, granules, or as a solution or a suspension in an aqueous or non-aqueous liquid, or as an oil-in-water or water-in-oil liquid emulsion, or as an elixir or syrup, or as pastilles (using an inert matrix, such as gelatin and glycerin, or sucrose and acacia) and/or as mouthwashes, and the like, each containing a predetermined amount of an inhibitor(s) as an active ingredient.
  • a composition may also be administered as a bolus, electuary, or paste.
  • the active ingredient may be mixed with one or more pharmaceutically acceptable carriers, such as sodium citrate or dicalcium phosphate, and/or any of the following: (1) fillers or extenders, such as starches, cyclodextrins, lactose, sucrose, glucose, mannitol, and/or silicic acid; (2) binders, such as, for example, carboxymethylcellulose, alginates, gelatin, polyvinyl pyrrolidone, sucrose, and/or acacia; (3) humectants, such as glycerol; (4) disintegrating agents, such as agar-agar, calcium carbonate, potato or tapioca starch, alginic acid, certain silicates, and sodium carbonate; (5) solution retarding agents, such as paraffin; (6) absorption accelerators, such as quaternary ammonium compounds; (7) wetting agents, such as paraffin; (6) absorption accelerators, such as quaternary ammonium compounds; (7) wetting agents, such as par
  • the pharmaceutical compositions may also comprise buffering agents. Solid compositions of a similar type may also be employed as fillers in soft and hard-filled gelatin capsules using such excipients as lactose or milk sugars, as well as high molecular weight polyethylene glycols, and the like.
  • the crystalline tripeptide epoxyketone is administered to a mammal as a capsule.
  • the crystalline tripeptide epoxyketone is a compound of formula (I).
  • the crystalline tripeptide epoxyketone is a compound of formula (II).
  • a tablet may be made by compression or molding, optionally with one or more accessory ingredients.
  • Compressed tablets may be prepared using binder (for example, gelatin or hydroxypropylmethyl cellulose), lubricant, inert diluent, preservative, disintegrant (for example, sodium starch glycolate or cross-linked sodium carboxymethyl cellulose), surface-active or dispersing agent.
  • Molded tablets may be made by molding in a suitable machine a mixture of the powdered inhibitor(s) moistened with an inert liquid diluent.
  • Tablets, and other solid dosage forms may optionally be scored or prepared with coatings and shells, such as enteric coatings and other coatings well known in the pharmaceutical-formulating art. They may also be formulated so as to provide slow or controlled release of the active ingredient therein using, for example, hydroxypropylmethyl cellulose in varying proportions to provide the desired release profile, other polymer matrices, liposomes, and/or microspheres. They may be sterilized by, for example, filtration through a bacteria-retaining filter, or by incorporating sterilizing agents in the form of sterile solid compositions which can be dissolved in sterile water, or some other sterile injectable medium immediately before use.
  • compositions may also optionally contain opacifying agents and may be of a composition that they release the active ingredient(s) only, or preferentially, in a certain portion of the gastrointestinal tract, optionally, in a delayed manner.
  • opacifying agents include polymeric substances and waxes.
  • the active ingredient can also be in micro-encapsulated form, if appropriate, with one or more of the above-described excipients.
  • Liquid dosage forms for oral administration include pharmaceutically acceptable emulsions, microemulsions, solutions, suspensions, syrups, and elixirs.
  • the liquid dosage forms may contain inert diluents commonly used in the art, such as, for example, water or other solvents, solubilizing agents, and emulsifiers such as ethyl alcohol, isopropyl alcohol, ethyl carbonate, ethyl acetate, benzyl alcohol, benzyl benzoate, propylene glycol, 1,3-butylene glycol, oils (in particular, cottonseed, groundnut, corn, germ, olive, castor, and sesame oils), glycerol, tetrahydrofuryl alcohol, polyethylene glycols, and fatty acid esters of sorbitan, and mixtures thereof.
  • inert diluents commonly used in the art, such as, for example, water or other solvents, solubilizing agents, and e
  • the oral compositions can also include adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring, coloring, perfuming, and preservative agents.
  • adjuvants such as wetting agents, emulsifying and suspending agents, sweetening, flavoring, coloring, perfuming, and preservative agents.
  • Suspensions in addition to the active inhibitor(s) may contain suspending agents as, for example, ethoxylated isostearyl alcohols, polyoxyethylene sorbitol and sorbitan esters, microcrystalline cellulose, aluminum metahydroxide, bentonite, agar-agar and tragacanth, and mixtures thereof.
  • suspending agents as, for example, ethoxylated isostearyl alcohols, polyoxyethylene sorbitol and sorbitan esters, microcrystalline cellulose, aluminum metahydroxide, bentonite, agar-agar and tragacanth, and mixtures thereof.
  • Formulations for rectal or vaginal administration may be presented as a suppository, which may be prepared by mixing one or more inhibitor(s) with one or more suitable nonirritating excipients or carriers comprising, for example, cocoa butter, polyethylene glycol, a suppository wax or a salicylate, which is solid at room temperature, but liquid at body temperature and, therefore, will melt in the rectum or vaginal cavity and release the active agent.
  • suitable nonirritating excipients or carriers comprising, for example, cocoa butter, polyethylene glycol, a suppository wax or a salicylate, which is solid at room temperature, but liquid at body temperature and, therefore, will melt in the rectum or vaginal cavity and release the active agent.
  • Formulations which are suitable for vaginal administration also include pessaries, tampons, creams, gels, pastes, foams, or spray formulations containing such carriers as are known in the art to be appropriate.
  • Dosage forms for the topical or transdermal administration of an inhibitor(s) include powders, sprays, ointments, pastes, creams, lotions, gels, solutions, patches, and inhalants.
  • the active component may be mixed under sterile conditions with a pharmaceutically acceptable carrier, and with any preservatives, buffers, or propellants which may be required.
  • the ointments, pastes, creams, and gels may contain, in addition to inhibitor(s), excipients, such as animal and vegetable fats, oils, waxes, paraffins, starch, tragacanth, cellulose derivatives, polyethylene glycols, silicones, bentonites, silicic acid, talc, and zinc oxide, or mixtures thereof.
  • excipients such as animal and vegetable fats, oils, waxes, paraffins, starch, tragacanth, cellulose derivatives, polyethylene glycols, silicones, bentonites, silicic acid, talc, and zinc oxide, or mixtures thereof.
  • Powders and sprays can contain, in addition to an inhibitor(s), excipients such as lactose, talc, silicic acid, aluminum hydroxide, calcium silicates, and polyamide powder, or mixtures of these substances.
  • Sprays can additionally contain customary propellants, such as chlorofluorohydrocarbons and volatile unsubstituted hydrocarbons, such as butane and propane.
  • the inhibitor(s) can be alternatively administered by aerosol. This is accomplished by preparing an aqueous aerosol, liposomal preparation, or solid particles containing the composition.
  • a nonaqueous (e.g., fluorocarbon propellant) suspension could be used.
  • Sonic nebulizers are preferred because they minimize exposing the agent to shear, which can result in degradation of the compound.
  • an aqueous aerosol is made by formulating an aqueous solution or suspension of the agent together with conventional pharmaceutically acceptable carriers and stabilizers.
  • the carriers and stabilizers vary with the requirements of the particular composition, but typically include nonionic surfactants (Tweens, Pluronics, sorbitan esters, lecithin, Cremophors), pharmaceutically acceptable co-solvents such as polyethylene glycol, innocuous proteins like serum albumin, oleic acid, amino acids such as glycine, buffers, salts, sugars, or sugar alcohols.
  • Aerosols generally are prepared from isotonic solutions.
  • Transdermal patches have the added advantage of providing controlled delivery of an inhibitor(s) to the body.
  • dosage forms can be made by dissolving or dispersing the agent in the proper medium.
  • Absorption enhancers can also be used to increase the flux of the inhibitor(s) across the skin. The rate of such flux can be controlled by either providing a rate controlling membrane or dispersing the inhibitor(s) in a polymer matrix or gel.
  • compositions of this invention suitable for parenteral administration comprise one or more inhibitors(s) in combination with one or more pharmaceutically acceptable sterile aqueous or nonaqueous solutions, dispersions, suspensions or emulsions, or sterile powders which may be reconstituted into sterile injectable solutions or dispersions just prior to use, which may contain antioxidants, buffers, bacteriostats, solutes which render the formulation isotonic with the blood of the intended recipient or suspending or thickening agents.
  • aqueous and nonaqueous carriers examples include water, ethanol, polyols (such as glycerol, propylene glycol, polyethylene glycol, and the like), and suitable mixtures thereof, vegetable oils, such as olive oil, and injectable organic esters, such as ethyl oleate.
  • polyols such as glycerol, propylene glycol, polyethylene glycol, and the like
  • vegetable oils such as olive oil
  • injectable organic esters such as ethyl oleate.
  • Proper fluidity can be maintained, for example, by the use of coating materials, such as lecithin, by the maintenance of the required particle size in the case of dispersions, and by the use of surfactants.
  • compositions may also contain adjuvants such as preservatives, wetting agents, emulsifying agents, and dispersing agents. Prevention of the action of microorganisms may be ensured by the inclusion of various antibacterial and antifungal agents, for example, paraben, chlorobutanol, phenol sorbic acid, and the like. It may also be desirable to include tonicity-adjusting agents, such as sugars, sodium chloride, and the like into the compositions. In addition, prolonged absorption of the injectable pharmaceutical form may be brought about by the inclusion of agents which delay absorption such as aluminum monostearate and gelatin.
  • adjuvants such as preservatives, wetting agents, emulsifying agents, and dispersing agents.
  • Prevention of the action of microorganisms may be ensured by the inclusion of various antibacterial and antifungal agents, for example, paraben, chlorobutanol, phenol sorbic acid, and the like. It may also be desirable to include tonicity-adjusting agents, such as sugars
  • delayed absorption of a parenterally administered drug form is accomplished by dissolving or suspending the drug in an oil vehicle.
  • Injectable depot forms are made by forming microcapsule matrices of inhibitor(s) in biodegradable polymers such as polylactide-polyglycolide. Depending on the ratio of drug to polymer, and the nature of the particular polymer employed, the rate of drug release can be controlled. Examples of other biodegradable polymers include poly(orthoesters) and poly(anhydrides). Depot injectable formulations are also prepared by entrapping the drug in liposomes or microemulsions which are compatible with body tissue.
  • agents may be given orally, parenterally, topically, or rectally. They are, of course, given by forms suitable for each administration route. For example, they are administered in tablets or capsule form, by injection, inhalation, eye lotion, ointment, suppository, infusion; topically by lotion or ointment; and rectally by suppositories. Oral administration is preferred.
  • parenteral administration and “administered parenterally” as used herein means modes of administration other than enteral and topical administration, usually by injection, and includes, without limitation, intravenous, intramuscular, intraarterial, intrathecal, intracapsular, intraorbital, intracardiac, intradermal, intraperitoneal, transtracheal, subcutaneous, subcuticular, intraarticular, subcapsular, subarachnoid, intraspinal and intrasternal injection, and infusion.
  • systemic administration means the administration of a ligand, drug, or other material other than directly into the central nervous system, such that it enters the patient's system and thus, is subject to metabolism and other like processes, for example, subcutaneous administration.
  • inhibitors(s) may be administered to humans and other animals for therapy by any suitable route of administration, including orally, nasally, as by, for example, a spray, rectally, intravaginally, parenterally, intracisternally, and topically, as by powders, ointments or drops, including buccally and sublingually.
  • the inhibitor(s), which may be used in a suitable hydrated form, and/or the pharmaceutical compositions of the present invention, are formulated into pharmaceutically acceptable dosage forms by conventional methods known to those of skill in the art.
  • Actual dosage levels of the active ingredients in the pharmaceutical compositions of this invention may be varied so as to obtain an amount of the active ingredient which is effective to achieve the desired therapeutic response for a particular patient, composition, and mode of administration, without being toxic to the patient.
  • compositions of this invention may be provided in an aqueous solution containing about 0.1-10% w/v of a compound disclosed herein, among other substances, for parenteral administration. Typical dose ranges are from about 0.01 to about 50 mg/kg of body weight per day, given in 1-4 divided doses. Each divided dose may contain the same or different compounds of the invention.
  • the dosage will be an effective amount depending on several factors including the overall health of a patient, and the formulation and route of administration of the selected compound(s).
  • C x-y alkyl refers to substituted or unsubstituted saturated hydrocarbon groups, including straight-chain alkyl and branched-chain alkyl groups that contain from x to y carbons in the chain, including haloalkyl groups such as trifluoromethyl and 2,2,2-trifluoroethyl, etc.
  • C 0 alkyl indicates a hydrogen where the group is in a terminal position, a bond if internal.
  • C 2-y alkenyl and “C 2-y alkynyl” refer to substituted or unsubstituted unsaturated aliphatic groups analogous in length and possible substitution to the alkyls described above, but that contain at least one double or triple bond respectively.
  • alkoxy refers to an alkyl group having an oxygen attached thereto. Representative alkoxy groups include methoxy, ethoxy, propoxy, tert-butoxy and the like.
  • An “ether” is two hydrocarbons covalently linked by an oxygen. Accordingly, the substituent of an alkyl that renders that alkyl an ether is or resembles an alkoxy.
  • C 1-6 alkoxyalkyl refers to a C 1-6 alkyl group substituted with an alkoxy group, thereby forming an ether.
  • C 1-6 aralkyl refers to a C 1-6 alkyl group substituted with an aryl group.
  • amine and “amino” are art-recognized and refer to both unsubstituted and substituted amines and salts thereof, e.g., a moiety that can be represented by the general formulae:
  • R 9 , R 10 and R 10′ each independently represent a hydrogen, an alkyl, an alkenyl, —(CH 2 ) m —R 8 , or R 9 and R 10 taken together with the N atom to which they are attached complete a heterocycle having from 4 to 8 atoms in the ring structure;
  • R 8 represents an aryl, a cycloalkyl, a cycloalkenyl, a heterocyclyl or a polycyclyl; and m is zero or an integer from 1 to 8.
  • only one of R 9 or R 10 can be a carbonyl, e.g., R 9 , R 10 , and the nitrogen together do not form an imide.
  • R 9 and R 10 each independently represent a hydrogen, an alkyl, an alkenyl, or —(CH 2 ) m —R 8 .
  • the amino group is basic, meaning the protonated form has a pK a ⁇ 7.00.
  • amide and “amido” are art-recognized as an amino-substituted carbonyl and includes a moiety that can be represented by the general formula:
  • R 9 , R 10 are as defined above.
  • Preferred embodiments of the amide will not include imides which may be unstable.
  • aryl as used herein includes 5-, 6-, and 7-membered substituted or unsubstituted single-ring aromatic groups in which each atom of the ring is carbon.
  • aryl also includes polycyclic ring systems having two or more cyclic rings in which two or more carbons are common to two adjoining rings wherein at least one of the rings is aromatic, e.g., the other cyclic rings can be cycloalkyls, cycloalkenyls, cycloalkynyls, aryls, heteroaryls, and/or heterocyclyls.
  • Aryl groups include benzene, naphthalene, phenanthrene, phenol, aniline, and the like.
  • carrier refers to a non-aromatic substituted or unsubstituted ring in which each atom of the ring is carbon.
  • carrier and “carbocyclyl” also include polycyclic ring systems having two or more cyclic rings in which two or more carbons are common to two adjoining rings wherein at least one of the rings is carbocyclic, e.g., the other cyclic rings can be cycloalkyls, cycloalkenyls, cycloalkynyls, aryls, heteroaryls, and/or heterocyclyls.
  • carbonyl is art-recognized and includes such moieties as can be represented by the general formula:
  • X is a bond or represents an oxygen or a sulfur
  • R 11 represents a hydrogen, an alkyl, an alkenyl, —(CH 2 ) m —R 8 or a pharmaceutically acceptable salt
  • R 11′ represents a hydrogen, an alkyl, an alkenyl or —(CH 2 ) m —R 8 , where m and R 8 are as defined above.
  • X is an oxygen and R 11 or R 11′ is not hydrogen, the formula represents an “ester”.
  • X is an oxygen
  • R 11 is a hydrogen
  • the formula represents a “carboxylic acid”.
  • heteroaryl includes substituted or unsubstituted aromatic 5- to 7-membered ring structures, more preferably 5- to 6-membered rings, whose ring structures include one to four heteroatoms.
  • heteroaryl also includes polycyclic ring systems having two or more cyclic rings in which two or more carbons are common to two adjoining rings wherein at least one of the rings is heteroaromatic, e.g., the other cyclic rings can be cycloalkyls, cycloalkenyls, cycloalkynyls, aryls, heteroaryls, and/or heterocyclyls.
  • Heteroaryl groups include, for example, pyrrole, furan, thiophene, imidazole, isoxazole, oxazole, thiazole, triazole, pyrazole, pyridine, pyrazine, pyridazine and pyrimidine, and the like.
  • heteroatom as used herein means an atom of any element other than carbon or hydrogen. Preferred heteroatoms are nitrogen, oxygen, phosphorus, and sulfur.
  • heterocyclyl or “heterocyclic group” refer to substituted or unsubstituted non-aromatic 3- to 10-membered ring structures, more preferably 3- to 7-membered rings, whose ring structures include one to four heteroatoms.
  • heterocyclyl or “heterocyclic group” also include polycyclic ring systems having two or more cyclic rings in which two or more carbons are common to two adjoining rings wherein at least one of the rings is heterocyclic, e.g., the other cyclic rings can be cycloalkyls, cycloalkenyls, cycloalkynyls, aryls, heteroaryls, and/or heterocyclyls.
  • Heterocyclyl groups include, for example, tetrahydrofuran, piperidine, piperazine, pyrrolidine, morpholine, lactones, lactams, and the like.
  • C 1-6 heterocycloalkyl refers to a C 1-6 alkyl group substituted with a heterocyclyl group.
  • C 1-6 hydroxyalkyl refers to a C 1-6 alkyl group substituted with a hydroxy group.
  • inhibitor is meant to describe a compound that blocks or reduces an activity of an enzyme (for example, inhibition of proteolytic cleavage of standard fluorogenic peptide substrates such as suc-LLVY-AMC, Box-LLR-AMC and Z-LLE-AMC, inhibition of various catalytic activities of the 20S proteasome).
  • An inhibitor can act with competitive, uncompetitive, or noncompetitive inhibition.
  • An inhibitor can bind reversibly or irreversibly, and therefore the term includes compounds that are suicide substrates of an enzyme.
  • An inhibitor can modify one or more sites on or near the active site of the enzyme, or it can cause a conformational change elsewhere on the enzyme.
  • orally bioavailable is meant to describe a compound administered to a mouse at 40 mg/kg or less, 20 mg/kg or less, or even 10 mg/kg or less, wherein one hour after oral administration such a compound shows at least about 50%, at least about 75% or even at least about 90% inhibition of proteasome CT-L activity in the blood.
  • peptide includes not only standard amide linkage with standard ⁇ -substituents, but commonly utilized peptidomimetics, other modified linkages, non-naturally occurring side chains, and side chain modifications, as detailed below.
  • polycyclyl or “polycyclic” refer to two or more rings (e.g., cycloalkyls, cycloalkenyls, cycloalkynyls, aryls, heteroaryls, and/or heterocyclyls) in which two or more carbons are common to two adjoining rings, e.g., the rings are “fused rings”.
  • rings e.g., cycloalkyls, cycloalkenyls, cycloalkynyls, aryls, heteroaryls, and/or heterocyclyls
  • Each of the rings of the polycycle can be substituted or unsubstituted.
  • proteasome as used herein is meant to include immuno- and constitutive proteasomes.
  • substantially pure refers to a crystalline polymorph that is greater than 90% pure, meaning that contains less than 10% of any other compound, including the corresponding amorphous compound.
  • the crystalline polymorph is greater than 95% pure, or even greater than 98% pure.
  • preventing is art-recognized, and when used in relation to a condition, such as a local recurrence (e.g., pain), a disease such as cancer, a syndrome complex such as heart failure or any other medical condition, is well understood in the art, and includes administration of a composition which reduces the frequency of, or delays the onset of, symptoms of a medical condition in a subject relative to a subject which does not receive the composition.
  • a condition such as a local recurrence (e.g., pain)
  • a disease such as cancer
  • a syndrome complex such as heart failure or any other medical condition
  • prevention of cancer includes, for example, reducing the number of detectable cancerous growths in a population of patients receiving a prophylactic treatment relative to an untreated control population, and/or delaying the appearance of detectable cancerous growths in a treated population versus an untreated control population, e.g., by a statistically and/or clinically significant amount.
  • Prevention of an infection includes, for example, reducing the number of diagnoses of the infection in a treated population versus an untreated control population, and/or delaying the onset of symptoms of the infection in a treated population versus an untreated control population.
  • Prevention of pain includes, for example, reducing the magnitude of, or alternatively delaying, pain sensations experienced by subjects in a treated population versus an untreated control population.
  • prodrug encompasses compounds that, under physiological conditions, are converted into therapeutically active agents.
  • a common method for making a prodrug is to include selected moieties that are hydrolyzed under physiological conditions to reveal the desired molecule.
  • the prodrug is converted by an enzymatic activity of the host animal.
  • prophylactic or therapeutic treatment is art-recognized and includes administration to the host of one or more of the subject compositions. If it is administered prior to clinical manifestation of the unwanted condition (e.g., disease or other unwanted state of the host animal) then the treatment is prophylactic, (i.e., it protects the host against developing the unwanted condition), whereas if it is administered after manifestation of the unwanted condition, the treatment is therapeutic, (i.e., it is intended to diminish, ameliorate, or stabilize the existing unwanted condition or side effects thereof).
  • the unwanted condition e.g., disease or other unwanted state of the host animal
  • proteasome as used herein is meant to include immuno- and constitutive proteasomes.
  • substituted refers to moieties having substituents replacing a hydrogen on one or more carbons of the backbone. It will be understood that “substitution” or “substituted with” includes the implicit proviso that such substitution is in accordance with permitted valence of the substituted atom and the substituent, and that the substitution results in a stable compound, e.g., which does not spontaneously undergo transformation such as by rearrangement, cyclization, elimination, etc. As used herein, the term “substituted” is contemplated to include all permissible substituents of organic compounds.
  • the permissible substituents include acyclic and cyclic, branched and unbranched, carbocyclic and heterocyclic, aromatic and non-aromatic substituents of organic compounds.
  • the permissible substituents can be one or more and the same or different for appropriate organic compounds.
  • the heteroatoms such as nitrogen may have hydrogen substituents and/or any permissible substituents of organic compounds described herein which satisfy the valences of the heteroatoms.
  • Substituents can include, for example, a halogen, a hydroxyl, a carbonyl (such as a carboxyl, an alkoxycarbonyl, a formyl, or an acyl), a thiocarbonyl (such as a thioester, a thioacetate, or a thioformate), an alkoxyl, a phosphoryl, a phosphate, a phosphonate, a phosphinate, an amino, an amido, an amidine, an imine, a cyano, a nitro, an azido, a sulfhydryl, an alkylthio, a sulfate, a sulfonate, a sulfamoyl, a sulfonamido, a sulfonyl, a heterocyclyl, an aralkyl, or an aromatic or heteroaromatic moiety. It will be understood by
  • a “therapeutically effective amount” of a compound with respect to the subject method of treatment refers to an amount of the compound(s) in a preparation which, when administered as part of a desired dosage regimen (to a mammal, preferably a human) alleviates a symptom, ameliorates a condition, or slows the onset of disease conditions according to clinically acceptable standards for the disorder or condition to be treated or the cosmetic purpose, e.g., at a reasonable benefit/risk ratio applicable to any medical treatment.
  • thioether refers to an alkyl group, as defined above, having a sulfur moiety attached thereto.
  • the “thioether” is represented by —S-alkyl.
  • Representative thioether groups include methylthio, ethylthio, and the like.
  • treating includes reversing, reducing, or arresting the symptoms, clinical signs, and underlying pathology of a condition in manner to improve or stabilize a subject's condition.
  • N-Boc phenylalanine-ketoepoxide 140 mg, 0.46 mmol was diluted with DCM (2 mL) and cooled to 0° C. To this solution was added trifluoroacetic acid (6 mL). The cooling bath was removed and the reaction stirred for 1 hour at which time TLC showed complete consumption of starting material. The resulting solution was concentrated under reduced pressure and placed under high vacuum to yield TFA salt of Compound (H).
  • Amorphous Compound 1 (50 mg) was dissolved in acetonitrile (1 mL), then deionized water (2 mL) was added, and the solution brought to supersaturation by slowly evaporating off 1 mL over about 1-2 weeks. The resulting crystals were filtered, washed with 1 mL 1:2 acetonitrile-water, and dried under vacuum for 12 hours to provide a crystalline polymorph of Compound 1 (25 mg) with a melting point of 148° C.
  • the characteristic DSC curve of the sample is shown in FIG. 1 as recorded on a TA Instruments Differential Scanning Calorimeter 2920 at a heating rate of 10° C./minute.
  • Amorphous Compound 1 (611 mg) was dissolved in tetrahydrofuran (5 mL), followed by addition of hexanes (5 mL) and the solution was seeded with crystalline polymorph Compound 1 as prepared in Example 2, and the solution brought to supersaturation by slowly evaporating off 5 mL over about 17 hours. The resulting crystals were filtered, washed with 1 mL 1:1 tetrahydrofuran-hexanes, and dried under vacuum for 12 hours to provide a crystalline polymorph of Compound 1 (150 mg) with a melting point of 147° C.
  • Amorphous Compound 1 (176 mg) was dissolved in tetrahydrofuran (5 mL), then toluene (25 mL) was added. The solution was seeded with crystalline polymorph Compound 1 as prepared in Example 2, and the solution was brought to supersaturation by slowly evaporating off 20 mL over about 2 days. The resulting crystals were filtered, washed with 15 mL toluene, and dried under vacuum for 12 hours to provide a crystalline polymorph of Compound 1 (88 mg) with a melting point of 149° C.
  • Amorphous Compound 1 (312 mg) was dissolved in toluene (50 mL), heated to about 100° C. to complete dissolution, then hexanes (50 mL) were added and the solution was seeded with crystalline polymorph Compound 1 as prepared in Example 2, and the solution brought to supersaturation by slowly evaporating off 60 mL over about 2 days. The resulting crystals were filtered, washed with 10 mL toluene, and dried under vacuum for 12 hours to provide a crystalline polymorph of Compound 1 (156 mg) with a melting point of 149° C.
  • Amorphous Compound 1 (1.4 g) was dissolved in toluene (25 mL), heated to about 50° C. to complete dissolution, then brought to supersaturation by cooling to 22° C. and allowing the compound to crystallize for 12 hours. The resulting crystals were filtered, washed with 5 mL hexanes, and dried under vacuum for 12 hours to provide a crystalline polymorph of Compound 1 (0.94 g) with a melting point of 149° C.
  • N-Boc phenylalanine-ketoepoxide (1.0 equivalent) was dissolved in DCM (3 L/kg of N-Boc phenylalanine-ketoepoxide) in a 3-neck round bottom flask under inert atmosphere and the solution was cooled in ice bath. Then, TFA (5.0 equivalents) was added at a rate to maintain the internal temperature below 10° C. The reaction mixture was then warmed to approximately 20° C. and stirred for 1 to 3 hours. MTBE (3.6 L/kg of N-Boc phenylalanine-ketoepoxide) was then added to the reaction mixture while maintaining mixture temperature below 25° C.
  • Crude Compound 1 was precipitated by pouring the reaction mixture onto 8% sodium bicarbonate (40 L/kg of Compound (G)) and the suspension of crude Compound 1 was stirred for 12 hours at 20 to 25° C., followed by stirring at 0 to 5° C. for 1 hour.
  • the white solid was filtered and rinsed with water (5 L/kg of Compound (G)).
  • the white solid was then reslurried in water (15 L/kg) for 3 hours at 20 to 25° C., filtered and rinsed with water (5 L/kg of Compound (G)) and isopropyl acetate (2 ⁇ 2 L/kg of Compound (G)).
  • the white solid was dried under vacuum at 45° C. to constant weight. Yield of crude Compound 1 was 65%, with HPLC purity of 97.2%.
  • Crude Compound 1 was completely dissolved in isopropyl acetate (20 L/kg of crude Compound 1) by stirring and heating at 85° C. The solution was then hot filtered to remove any particulate mater and the solution was re-heated to 85° C. to provide clear solution. The clear solution was allowed to cool at 10° C. per hour to 65° C. before adding seed crystals. The solution was allowed to cool at 10° C. per hour to 20° C., when substantial crystallization of Compound 1 occurred. The suspension was stirred at 20° C. for 6 hours, followed by stirring at 0 to 5° C. for a minimum of 2 hours and filtration and rinsing with isopropyl acetate (1 L/kg of crude Compound 1). The purified Compound 1 was dried under vacuum at 45° C. for a minimum of 24 hours to constant weight. Yield of Compound 1 was 87%, with HPLC purity 97.2%.
  • the reaction mixture was quenched by addition of pre-chilled saturated sodium bicarbonate (94 L/kg of Compound (G)), while maintaining internal temperature of less 10° C. The content was then transferred to a separatory funnel. The mixture was extracted with ethyl acetate (24 L/kg of Compound (G)), and the organic layer was washed with saturated sodium bicarbonate (12 L/kg of Compound (G)) and with saturated sodium chloride (12 L/kg of Compound (G).
  • the organic layer was concentrated under reduced pressure with a bath temperature of less than 30° C. to 15 L/kg of Compound (G), followed by co-distillation with isopropyl acetate (2 ⁇ 24 L/kg of PR-022). Final volume was adjusted to 82 L/kg of Compound (G) with isopropyl acetate before heating to 60° C. to obtain a clear solution.
  • the clear solution mixture was allowed to cool to 50° C. before adding seed crystals.
  • the solution was allowed to cool to 20° C., when substantial crystallization of Compound 1 had occurred.
  • the suspension was stirred at 0° C. for 12 hours before filtration and rinsing with isopropyl acetate (2 L/kg of Compound 1).
  • Compound 1 was dried under vacuum at 20° C. for 12 hours to constant weight. Yield of Compound 1 was 48%, with HPLC purity of 97.4%.

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