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CN108101841B - Method for preparing indacaterol or salt thereof - Google Patents

Method for preparing indacaterol or salt thereof Download PDF

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CN108101841B
CN108101841B CN201711181431.2A CN201711181431A CN108101841B CN 108101841 B CN108101841 B CN 108101841B CN 201711181431 A CN201711181431 A CN 201711181431A CN 108101841 B CN108101841 B CN 108101841B
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salt
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indacaterol
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CN108101841A (en
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张顺吉
田伟伟
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Jiangsu Hengrui Medicine Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D215/00Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems
    • C07D215/02Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom
    • C07D215/16Heterocyclic compounds containing quinoline or hydrogenated quinoline ring systems having no bond between the ring nitrogen atom and a non-ring member or having only hydrogen atoms or carbon atoms directly attached to the ring nitrogen atom 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
    • C07D215/20Oxygen atoms
    • C07D215/24Oxygen atoms attached in position 8
    • C07D215/26Alcohols; Ethers thereof
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/50Improvements relating to the production of bulk chemicals
    • Y02P20/55Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)

Abstract

The invention relates to a method for preparing indacaterol or a salt thereof. Specifically, the method selects hydrogen diluted by inert gas as a hydride source to prepare the high-purity indacaterol maleate under the condition of metal catalysis.

Description

Method for preparing indacaterol or salt thereof
Technical Field
The invention relates to the field of drug synthesis, in particular to an improved preparation method of indacaterol or a salt thereof.
Background
Indacaterol maleate is a bronchodilatory active β -selective adrenoceptor agonist developed by novartis, useful in the treatment of asthma and chronic obstructive pulmonary disease, and has a very long duration of action in vitro and in vivo.
Indacaterol maleate is chemically known as 5- [ (1R) -2- [ (5, 6-diethyl-2, 3-dihydro-1H-indan-2-yl) amino ] -1-hydroxyethyl ] -8-hydroxy-1H-quinolin-2-one maleate and has the following structural formula:
Figure BDA0001479239510000011
methods for the synthesis of indacaterol are disclosed in the prior art. For example, in the methods reported in patents US6878721, WO200476422, WO2005123684, etc., the compound 8-benzyloxy-5- (R) -oxiranyl- (1H) -quinolin-2-one reacts with 5, 6-diethyl-2, 3-dihydro-1H-inden-2-amine to obtain an intermediate, and the indacaterol is obtained by removing the benzyl protecting group, and the reaction route is as follows:
Figure BDA0001479239510000012
in the process of removing the benzyl protecting group, the compound 3 is easily over-hydrogenated to generate the impurity A, and the impurity is difficult to remove by conventional purification means, such as column chromatography or recrystallization. The process conditions are to be further optimized.
Figure BDA0001479239510000013
Therefore, research and development on a process for preparing indacaterol or a salt thereof are required.
The invention provides a method for preparing indacaterol or salt thereof, which can effectively inhibit the generation of impurity A, and the obtained product is easy to purify and suitable for industrial production.
Disclosure of Invention
The present invention provides a process for preparing indacaterol or a salt thereof, the process comprising: subjecting the compound of formula II or a salt thereof to a catalytic hydrogenation reaction under the condition of a metal catalyst/hydride source to obtain the compound of formula I, indacaterol or a salt thereof,
Figure BDA0001479239510000021
wherein R is1Is a hydroxy protecting group, R2The hydride source is a hydrogen-containing mixed gas in order to avoid over-hydrogenation of the compound of formula I, wherein the content of hydrogen in the mixed gas is not higher than 90% (V/V), preferably 40-80% (V/V), and specifically may be 40, 45, 50, 55, 60, 65, 70, 75, 80%, more preferably 50-75% (V/V); the hydrogen-containing mixed gas is prepared by mixing high-purity hydrogen with inert gas, such as nitrogen and argon, which is well known to those skilled in the art; the metal catalyst used for the catalytic hydrogenation reaction is well known to those skilled in the art, and is preferably at least one selected from palladium on carbon, palladium hydroxide, platinum oxide, palladium on alumina, platinum on activated carbon and Raney nickel, and more preferably palladium on carbon, palladium hydroxide.
In the embodiment of the present invention, the amount of the metal catalyst used in the catalytic hydrogenation reaction is 1 to 20% (by mass, calculated as the mass of the compound of formula II), specifically 1,2, 3, 4, 5,6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20% (by mass), and preferably 5 to 10% (by mass); the molar concentration of the materials in the reaction is 0.1-2M (calculated by the molar concentration of the compound in the organic solvent, shown as the formula II), and preferably 0.1-1.25M.
The palladium-carbon used in the invention contains 1-20% (by mass) of palladium, specifically 5%, 10% and 15%.
The solvent (first solvent) used in the catalytic hydrogenation reaction of the present invention is selected from alkyl acetates, such as ethyl acetate; alcohols, e.g. C1-6Alkyl alcohols such as methanol, ethanol, propanol, butanol and pentanol; aliphatic C6-12A hydrocarbon; dimethylformamide; aromatic hydrocarbons such as toluene and benzene; acetonitrile; heterocycles, such as tetrahydrofuran; a dialkyl ether; dimethyl sulfoxide; dialkyl carbonates, such as dimethyl carbonate; acids, such as acetic acid, trifluoroacetic acid; aqueous solvents, such as water; an ionic liquid; chlorinated solvents, such as dichloromethane. Mixtures of solvents may also be used. Preferably at least one of ethyl acetate, methanol, ethanol, propanol, butanol, pentanol, N-dimethylformamide, toluene, benzene, acetonitrile, tetrahydrofuran, dimethyl sulfoxide, acetic acid, trifluoroacetic acid, water, dichloromethane, more preferably at least one of methanol, ethanol, propanol, butanol, pentanol, acetic acid, trifluoroacetic acid.
The temperature of the catalytic hydrogenation reaction is preferably 0-70 ℃, preferably 10-50 ℃, and more preferably 10-30 ℃.
In a specific embodiment of the invention, the hydroxy protecting group (R)1) Is benzyl having the formula:
Figure BDA0001479239510000031
in a specific embodiment of the invention, the hydroxy protecting group (R)1) For benzyl, said amino-protecting group (R)2) Is benzyl having the formula:
Figure BDA0001479239510000032
in a preferred embodiment of the present invention, the hydroxyl protecting group (R)1) For benzyl, said amino-protecting group (R)2) Is hydrogen, having the formula:
Figure BDA0001479239510000033
the compound salt of the formula II is tosylate, methoxybenzenesulfonate or nitrobenzenesulfonate, and is preferably tosylate.
Further, in a solvent, the compound of formula III and the compound of formula IV undergo an epoxy ring-opening reaction (ring-opening reaction for short) to produce the compound of formula II.
The solvent used in the ring-opening reaction is selected from dimethyl sulfoxide, N-dimethylformamide, acetonitrile, N-methylpyrrolidone or C3-C6Preferably dimethyl sulfoxide, N-dimethylformamide; the temperature used in the ring-opening reaction is 10-160 ℃, preferably 50-140 ℃, and more preferably 80-120 ℃.
Figure BDA0001479239510000034
Wherein R is1、R2As defined above.
In a preferred embodiment the amino protecting group is benzyl and the compound of formula IV has the formula:
Figure BDA0001479239510000041
researchers take the compound 2B to participate in the epoxy ring-opening reaction to obtain the corresponding compound shown in the formula II, the method can reduce the generation of impurities B and C, reduce the workload of subsequent purification, improve the yield of the whole synthetic route and the utilization rate of the compound shown in the formula III,
Figure BDA0001479239510000042
the invention also provides a preparation method of the indacaterol salt, which comprises the step of reacting the compound of the formula II obtained by the catalytic hydrogenation reaction with a corresponding acid in a solvent (a second solvent) to obtain the indacaterol salt, preferably the indacaterol maleate.
Figure BDA0001479239510000043
The second solvent of the present invention may be, but is not limited to, at least one of methanol, ethanol, propanol, butanol, amyl alcohol ethyl acetate, and dichloromethane; the acid is selected from benzoic acid, maleic acid, succinic acid, fumaric acid and tartaric acid, and is preferably maleic acid.
The invention also provides the indacaterol or the pharmaceutically acceptable salt thereof prepared by the method.
The present invention also provides a drug substance comprising indacaterol or a salt thereof, wherein the content of impurity a is less than 0.4%, preferably less than 0.3%, more preferably less than 0.2%, most preferably less than 0.1%, for example less than 0.09%, 0.08%, 0.07% or 0.06% of impurity a. It is to be understood that the content of impurity a here is a content value determined by HPLC.
The "hydroxyl-protecting group" or "amino-protecting group" according to the present invention is a group known in the art to be suitably used for hydroxyl protection, see hydroxyl-protecting Groups in the literature ("Protective Groups in Organic Synthesis", 5th.ed.t.w.green & p.g.m.wuts). Illustratively, the hydroxyl or amino protecting group, together with the oxygen or nitrogen atom to which it is bound, is preferably benzyl (Bn), p-methoxybenzyl, 2,4, 6-trimethoxybenzyl, Methoxyethoxymethyl Ether (MEM), trityl (Tr), Dimethoxytrityl (DMT), methoxymethyl ether (MOM), or the like, to form an alkyl ether.
Detailed description of the invention
Unless stated to the contrary, the following terms used in the specification and claims have the following meanings.
"alkyl" refers to a saturated aliphatic hydrocarbon group selected from alkyl groups containing 1 to 6 carbon atoms (which may be described as C)1-6Alkyl groups). Non-limiting examples include methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert-butyl, sec-butyl, n-pentyl, 1-dimethylpropyl, 1, 2-dimethylpropyl, 2-dimethylpropyl, 1-ethylpropyl, 2-methylbutyl, 3-methylbutyl, n-hexyl, 1-ethyl-2-methylpropyl, 1, 2-trimethylpropyl, 1-dimethylbutyl, 1, 2-dimethylbutyl, 2-dimethylbutyl, 1, 3-dimethylbutyl, 2-ethylbutyl, 2-methylpentyl, 3-methylpentyl.
The sample detection method (HPLC) of the present invention is as follows:
a chromatographic column: YMC-Pack ODS-AQ (5 μm 150X 4.6 mm); wavelength: 210 nm; mobile phase: water/acetonitrile, phosphate as buffer.
The reagents according to the invention are commercially available and are prepared by the methods described in the intermediates referred to in WO2004076422 or WO 2000075114.
Detailed Description
The present invention will be explained in detail with reference to specific examples below, so that those skilled in the art can more fully understand the specific examples of the present invention to illustrate the technical solutions of the present invention, and not to limit the present invention in any way.
Example 1:
Figure BDA0001479239510000051
dissolving a compound 3a (100g, prepared according to the method in the patent WO 2000075114) in methanol (2L), adding a 5% palladium carbon catalyst (wet., 5g), pumping gas for 2 times by using a hydrogen-nitrogen mixed gas (70% V/V hydrogen), charging the hydrogen-nitrogen mixed gas, stirring for reaction for 17-18 hours, detecting the reaction completion by TLC, filtering to remove the catalyst, adding 100mL of a methanol solution of maleic acid (26g) into the obtained mother liquor, removing a part of the solvent (1.5L) by decompression, adding 2L of ethanol, stirring, and filtering to obtain 93g of indacaterol maleate, wherein the yield is 88%, the HPLC purity is 99%, and the impurity A is 0.06%.
1HNMR(BRUKER-400MHz,DMSO-d6)δ9.02(s,2H),8.19-8.16(d,1H),7.21-7.19(d,1H),7.03(s,2H),7.02-7.00(d,1H),6.62-6.60(d,1H),6.23(s,1H),6.04(s,2H),5.36-5.33(m,1H),4.12-4.04(m,1H),3.28-3.00(m,6H),2.59-2.54(q,4H),1.15-1.11(t,6H).
Example 2:
Figure BDA0001479239510000061
dissolving a compound 3a (100g) in methanol (2L), adding a 5% palladium carbon catalyst (wet., 5g), pumping gas for 2 times by using hydrogen, filling the hydrogen, stirring the mixture to react for 17-18 hours, detecting the reaction completion by TLC, filtering the mixture to remove the catalyst, adding 100mL of methanol solution of maleic acid (26g) into the obtained mother liquor, decompressing and spinning off part of the solvent (1.5L), adding 2L of ethanol, pulping, filtering, and blowing and drying the mixture for 5 hours at 50 ℃ to obtain 90g of indacaterol maleate, wherein the yield is 88%, the HPLC purity is 99%, and the impurity A is 0.5%.
Example 3: preparation of maleate salt of impurity A
Figure BDA0001479239510000062
Dissolving the compound 3a (5g) in methanol (2L), adding 10% palladium carbon catalyst (wet., 5g), pumping gas for 2 times by using hydrogen, filling hydrogen, stirring for reaction, filtering to remove the catalyst, concentrating to dryness, and purifying by column chromatography to obtain an impurity A crude product. The crude product of impurity A was dissolved in 100mL of absolute ethanol, 10mL of ethanol solution of maleic acid (0.5g) was added, the mixture was heated at 50 ℃ for 30 minutes, part of the solvent (70mL) was removed under reduced pressure, and the mixture was filtered and dried by blowing at 50 ℃ for 5 hours to obtain 1g of maleate salt of impurity A, the HPLC purity was 99%.
1HNMR(BRUKER-400MHz,DMSO-d6)δ9.86(s,1H),8.96(s,2H),8.77(s,1H),7.02(s,2H),7.00(d,1H),6.78-6.76(d,1H),6.04(s,2H),5.99(d,1H),5.04-5.01(m,1H),4.1-4.0(m,1H),3.3-2.8(m,8H),2.7-2.3(m,6H),1.2-1.1(t,6H).
Example 4:
Figure BDA0001479239510000063
the conditions for the selection of hydrodebenzylation by catalytic hydrogenation described above with reference to example 1: dissolving the compound 3a (0.5g) in methanol (30mL), adding a catalyst and a hydride source, stirring to react completely, directly sampling for HPLC central control detection, wherein specific data are shown as follows:
TABLE 1
Figure BDA0001479239510000064
Figure BDA0001479239510000071
From the data of the above experimental examples, it can be easily found that the generation of the impurity a by over-hydrogenation during the reaction can be effectively controlled by selecting 60% (V/V) or 70% (V/V) hydrogen as the hydride source, and the generation of the impurity is not related to the kind of the catalyst, the amount of the catalyst, the activity of the catalyst and the amount of the catalyst containing different palladium.

Claims (16)

1. A process for the preparation of indacaterol or a salt thereof, comprising catalytically hydrogenating a compound of formula II or a salt thereof in the presence of a metal catalyst/hydride source to obtain indacaterol or a salt thereof, wherein R is1Is a hydroxy protecting group, R2Is a hydrogen or an amino protecting group,
Figure FDA0002845662290000011
the method is characterized in that the hydride source is mixed gas with the hydrogen content of 40-80%, and the mixed gas consists of hydrogen and inert gas; the metal catalyst is selected from at least one of palladium on carbon, palladium hydroxide, platinum oxide, palladium on alumina, platinum on activated carbon, and raney nickel.
2. The method according to claim 1, wherein the mixed gas contains 50 to 75% of hydrogen.
3. The method according to claim 1, wherein the metal catalyst is selected from palladium on carbon and palladium hydroxide.
4. The process according to claim 1, wherein the compound of formula II is
Figure FDA0002845662290000012
Wherein R is2Is an amino protecting group.
5. The method according to claim 4, wherein R is2Is benzyl.
6. The process according to any one of claims 1 to 3, wherein the compound of formula II is
Figure FDA0002845662290000021
7. The process according to any one of claims 1 to 5, wherein the salt of the compound of formula II is tosylate, methoxybenzenesulfonate or nitrobenzenesulfonate.
8. The method according to claim 7, wherein the salt of the compound of formula II is a tosylate salt.
9. The preparation method according to claim 1, wherein the compound of formula II is obtained by ring-opening reaction of a compound of formula III with a compound of formula IV,
Figure FDA0002845662290000022
wherein R is1And R2As claimed in claim 1.
10. The process according to claim 9, wherein the solvent used in the ring-opening reaction is selected from the group consisting of dimethyl sulfoxide, N-dimethylformamide, acetonitrile, N-methylpyrrolidone and C3-C6At least one ketone solvent of (1).
11. The method according to claim 10, wherein the solvent used in the ring-opening reaction is dimethyl sulfoxide or N, N-dimethylformamide.
12. The process according to any one of claims 1 to 5, wherein the solvent used in the catalytic hydrogenation is at least one selected from the group consisting of ethyl acetate, methanol, ethanol, propanol, butanol, pentanol, N-dimethylformamide, toluene, benzene, acetonitrile, tetrahydrofuran, dimethyl sulfoxide, acetic acid, trifluoroacetic acid, water and dichloromethane.
13. The method according to claim 12, wherein the solvent used in the catalytic hydrogenation is at least one selected from the group consisting of methanol, ethanol, propanol, butanol, pentanol, acetic acid, and trifluoroacetic acid.
14. A process for the preparation of a pharmaceutically acceptable salt of indacaterol comprising the steps of obtaining indacaterol by the process of any one of claims 1 to 13 and then forming the salt with an acid selected from benzoic acid, maleic acid, succinic acid, fumaric acid, tartaric acid.
15. The method according to claim 14, wherein the acid is maleic acid.
16. The method according to claim 14 or 15, wherein the solvent used in the salt forming step is selected from at least one of methanol, ethanol, propanol, butanol, pentanol, ethyl acetate, and dichloromethane.
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CN113912536A (en) * 2020-07-07 2022-01-11 四川海思科制药有限公司 Indacaterol hydrate, and preparation method and application thereof
CN114591236A (en) * 2020-12-02 2022-06-07 四川海思科制药有限公司 A kind of improved preparation method of indacaterol

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CN1753874A (en) * 2003-02-28 2006-03-29 诺瓦提斯公司 Process for preparing 5-'(r)-2-(5,6-diethyl-indian-2-ylamin o)-1-hydroxy-ethyl-8-hydroxy-(1h)-quinolin-2-one salt, useful as an adrenoceptor agonist
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