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GB2261661A - Derivatives of poly-4-amino-2-carboxy-1-methyl pyrroles - Google Patents

Derivatives of poly-4-amino-2-carboxy-1-methyl pyrroles Download PDF

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Publication number
GB2261661A
GB2261661A GB9124733A GB9124733A GB2261661A GB 2261661 A GB2261661 A GB 2261661A GB 9124733 A GB9124733 A GB 9124733A GB 9124733 A GB9124733 A GB 9124733A GB 2261661 A GB2261661 A GB 2261661A
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Prior art keywords
methyl
bis
pyrrolecarbonylimino
compound
formula
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GB9124733D0 (en
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Nicola Mongelli
Giovanni Biasoli
Alfredo Paio
Mariangela Mariani
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Pfizer Italia SRL
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Farmitalia Carlo Erba SRL
Carlo Erba SpA
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D417/00Heterocyclic 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
    • C07D417/14Heterocyclic 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 three or more hetero rings
    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D207/00Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
    • C07D207/02Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
    • C07D207/30Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two double bonds between ring members or between ring members and non-ring members
    • C07D207/34Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having two 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

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Abstract

A derivative of a substituted carboxypyrrole having the following formula (I> <IMAGE> wherein W is = 0, = S or = N-H each of m and n is 1 to 4; each of B and B1 is: a) a -(CH2)p-NR1R2 group, wherein p is 2 to 4 and each of R1 and R2 is hydrogen or C1-C6 alkyl; b) <IMAGE> group, wherein q is 1 to 4; R3 is hydrogen and each of R4 and R5 is hydrogen or C1-C6 alkyl; or R3 and R4, taken together, form a-CH=CH-, -CH2-CH2- or -CH2CH2-CH2- chain, and R5 is hydrogen or C1-C6 alkyl; c) a saturated or unsaturated, carbocyclic or condensed carbocyclic ring substituted by one to three basic groups; or d) a saturated or unsaturated, heteromonocyclic or heterobicyclic ring, containing one to three heteroatom chosen from nitrogen, oxygen and sulphur, substituted by one to three basic groups; and the pharmaceutically acceptable salts thereof, (including known compounds in which W is 0, m and n are 2, B and B1 are the same and as defined above under b), q is 2 and R3, R4 and R5 are hydrogen) are active as angiogenesis inhibitors.

Description

DERIVATIVES OF POLY-4-AMINO -2-CARBOXY-1-METHYL COMPOUNDS" The present invention relates to new derivatives of substituted pyrroles, to a process for their preparation and to a pharmacological composition containing them.
The pyrrole derivatives of the invention may be regarded as derivatives of Distamycin A which is a known compound having the following formula
Literature referring to Distamycin A includes, for example NATURE 203, 1064 (1964).
The present invention provides new derivatives of substituted carboxypyrroles having the following general formula (I)
wherein W is =0, =S or =N-H each of m and n, being the same or different, is an integer of 1 to 4; each of B and B1, which may be the same or different, is: a) a -(CH2)p-NR1R2 group, wherein p is an integer of 2 to 4 and each of R1 and R2, independently, is hydrogen or C1-C6 alkyl;
group, wherein is an integer of 1 to 4; R3 is hydrogen and each of R4 and R5, independently, is hydrogen or C1-C6 alkyl; or R3 and R4, taken together, form a -CH=CH- -CH2-CH2- or -CH2-CH2-CH2- chain, CH2 R5 is hydrogen or C1-C6 alkyl; c) a saturated or unsaturated, carbocyclic or condensed carbocyclic ring substituted by one to three basic groups; or d) a saturated or unsaturated, heteromonocyclic or hetero bicyclic ring, containing one to three heteroatoms chosen from nitrogen, oxygen and sulphur, substituted by one to three basic groups ; and the pharmaceutically acceptable salts thereof, and wherein, when, at the same time, W is =0, m and n being the same are 2, B and B1 are same and as defined above under b), q is 2, then at least one of R4 and R5 is other then hydrogen.
An alkyl group may be a branched or straight alkyl group.
A C1-C6 alkyl group is preferably a C1-C4 alkyl group.
A C1-C4 alkyl group is preferably methyl, ethyl, propyl or isopropyl.
When two or three basic groups are present on the same B or B1 substituent, they may be the same or different.
Examples of basic groups,according to the definitions of B and B1, given above under c) and d), for instance may be those chosen from -(CH2)r-NR6R7, in whichr is zero or an integer of 1 to 4 and each of R6 and R7, independently, is hydrogen or C1-C6 alkyl;
in which r is as defined above, R8 is hydrogen and each of Rg and R10, independently, is hydrogen or C1-C6 alkyl, or R8 and R9, taken together, form a -CH=CH-, -CH2-CH 2 or -CH2-CH2-CH2- chain and R10 is hydrogen or C1-C6 alkyl and
wherein R8, R9 and R10 are as defined above.
a.
When n a -(CH2)p - or - (CH2)r - group p and/or r is higher than 1, the alkylene chain,thus provided, may be a branched or straight alkylene chain.
When B or B1 is a ring as defined above under c), it is for example phenyl or naphthyl, in particular naphthyl.
When B or B1 is a ring as defined above under d), it is for example thiazole, pyridine, pyrimidine, pyrazine, pyridazine, tetrahydropyran or tetrahydrofuran ; in particular thiazole, pyrimidine or tetrahydropyran.
As already said, the invention includes within its scope also the pharmaceutically acceptable salts of the compounds of formula (I).
The pharmaceutically acceptable salts of the compounds of formula (I) include those formed with an inorganicacide.g. nitric acid, hydrochloric acid or sulphuric acid, or with an organic acid, e.g; citric, malic, maleic, mandelic, tartaric, fumaric or methanesulphonic acid.
The present invention also includes within its scope pharmaceutically acceptable bioprecursors (otherwise known as pro-drugs) of the compounds of formula (I), i.e. compounds which have a different formula to formula (I) above, but which nevertheless upon administration to a human being are converted directly or indirectly in vivo into a compound of formula (I).
Preferred compounds according to the present invention are the compounds of formula (I), wherein each of m and n, being the same, is 2 or 3; W is as defined above, each of B and B1, which are the same or different, is a' -(CH2)p-NR1R2 wherein p is 2 or 3 and each of R1 and R2 independently is hydrogen or C1-C4 alkyl;
wherein q is 2 or 3; R3, BA and R5 are each hydrogen or R3 and R4, together, form a -CH2-CH2-, -CH=CHor -CH2-CH2-CH2- chain and R5 is hydrogen ; c') a phenyl or naphthyl group substituted by one, two or three basic groups chosen independently from
(CH2)rNR6R7 and
in which r is as defined above and each of R6and R7, independently, is hydrogen or C1-Cfl alkyl, or d) a thiazole, pyrimidine or tet.rahydropyranyl ring substituted by one, two or three basic groups, as defined above under c'); and the pharmaceutical3y acceptable salts thereof, and wherein when, at the same time, W is =0, m and n are 2, B and B1 are the same and as defined above under b'), R3, R4 and R5 are hydrogen, then q is 3.
specific examples of preferred compounds of the invention, are the following : 4,4'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonyl)imino(N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl -4,2-pyrrolecarbonylmino(3-proptonamidine)) ; 4,4t-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonyl- imino(N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl -d,2-lryrrolecarbonyZimino(3-propyldimethylam.ine)); 4,4'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino(N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl -4, 2-pyrrolecarbonylimino(3-propionamidine)); 4,4'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino(N-methyl-4.2-pyrrole)carbonylimino))-bis(N-methyl 4,2-pyrrolecarbonylimino(3-propyldimenthylamine));; 4,4'-(1,3-guanidine-bis-(N-methyl-4,2-pyrrolecarbonylimino(N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl4,2-pyrrolecarbonylimino(3-propionamidine)) ; 4,4'-(1,3-guanidine-bis-(N-methyl-4,2-pyrrolecarbonyl imino(N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl- -4,2-pyrrolecarbonylimino(3-propyldimethylamine)); 8,8'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1-naphthaleneamine -N,N-dimethyl) ; 8,8'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(i-naphthaleneamine -N,N-dimethyl); 5,5'-(carbonyl-bis(imino-N-methyl4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1-naphthaleneamine -N,N-dimethyl); As 5,5'-(thiocarbonyl-bis(imino-N-methl-4,2-pyrrolecarbonylino (N-methyl-4,2-pyrrole)carbonylimino))-bis(l-naphthaleneamine -N,N-dimethyl); 4,4'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1,8-naphthalenediamine -N,N,N',N',-tetramethyl) ; 4,4'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1,8-naphthalenediamine -N,N,N',N+ -tetramethyl) ; 3,3'-(carbonyl-bis(imino-N-methl-4,2-pyrrolecarbonylimino (N'-methyl-4,2-pyrrole)carbonylimino))-bis(l-phenyleneamine - N,Ndimethyl); 3,3'-(thiocArbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (Ns-methyl-4,2-pyrrole)carbonylimino))-bis(1-pheneyleneamine - N,Ndimethyl); 2,2'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino ( methyl-4,Z-pyrrole)carbonylimino))-bis(4-thiazoleamine -N,N-dimethy ; 2,2'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (NSmethyl-4,2-pyrrcle)carbonylimino))-bis(4-thia2oleamine -N,Ndimethyl); and the pharmaceutically acceptable salts threof, in particular the salts with hydrochloric acid and hydrobromic acid.
The above proviso in formula (I) excludes from its scope a known compound, which has been disclosed by J. Med. Chem.
1989, 32, 2368-2375. In that paper the synthesis of a group of oligopeptides and their antiviral and tumour cell cytotoxic properties have been reported. However, no invention is made of their use as angiogenesis inhibitors. Now we have found that this known compound, in common with the new compounds of formula (1), according to the present invention, has angiogenesis inhibition activity.Accordingly a further object of the present invention is the use of a compound of formula (I)
wnereln W is = O, =S or =N-H each of m and n, being the same or different, is an integer of 1 to 4; each of B and B1, which may be the same or different, is: a) a -(CH2)p-NRlR2 group, wherein p is an integer of 2 to 4 and each of R1 and R2, independently, is hydrogen or C1-C6 alkyl;
group, wherein q is an integer of 1 to 4; R3 is hydrogen and each of R4 and B, independently, is hydrogen or C1-C6 alkyl; or R3 and R4, taken together, form a -Ct=CH, -CH2-CHz- or -CH 2-CH2-CH2 - chain, and R5 is hydrogen or C1-C6 alkyl; c) a saturated or unsaturated, carbocyclic or condensed carbocyclic ring substituted by one to three basic groups; or d) a saturated or unsaturated, heteromonocyclic or heterobicyclic ring, containing one to three heteroatoms chosen from nitrogen, oxygen and sulphur, substituted by one to three basic groups; or a pharmaceutically acceptable salt thereof, in the preparation of a pharmaceutical composition for the use as an angiogenesis inhibitor in mammals.
Preferred compounds of formula (I) to be used as active agents in the preparation of a pharmaceutical composition for use as angiogenesis inhibitor are the followings: 4,4'-(carbonyl-bis(Imino-N-methyl-4,2-pyrrolecarbonylimino(N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl -4,2-yrrolecarbonylmino(3-propionamidine)) ; 4,4'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonyl imino(N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl -4,2-pyrrolecarbonylimino(3-propyldimethylamine)) ; a 4,4'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino(Nmethyl-4,2-pyrrole)carbonylimino))-bis(N-methyl -4,2-pyrrolecarbonylimino(3-propionamidine)) ; 4,4'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino(N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl4,2-pyrrolecarbonylimino(3-propyldimenthylamine)) ; 4,4'-(1,3-guanidine-bis-(N-methyl-4,2-pyrrolecarbonylimino(N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl4,2-pyrrolecrbonylimino(3-propionamidine)) ; 4,4'-(1,3-guanidine-bis-(N-methyl-4,2-pyrrolecarbonylimino(N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl -4,2-pyrrolecarbonylimino(3-propyldimethylamine)) ; 4,4'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino)-bis-(N-methyl-4,-2-pyrrolecarbonylimino(3 -propionamidine)) ; 8,8'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(i-naphthaleneamine -N,N-dimethyl) ; 8,8'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1-naphthaleneamine -N,N-dimethyl) ; 5,5'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1-naphthaleneamine -N,N-dimethyl) ; 5,5'-(thiocarbonyl-bis(imino-N-methyl-4,2-yrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1-naphthaleneamine - N,Ndimethyl) 4,4'-(earbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1,8-naphthalenediamine -N,N,N,N' ,-tetramothyl); 4,4'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1,8-naphthalenediamine -N,N,N,N'-tetramethyl) ; 3,3'-(carbonyl-bin(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1-phenyleneamine -NfN-dimethyl ); 3,3'-(thiocarbonyl-bistimino-N-met;hyl-4,2-pyrrolecarbonyliminn (N-methyl-4,2-pyrrole)carbonylimino)-bis(1-phenyleneamine -N,N-dimethyl): 2,2'-(carbonyl-tis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(4-thiazoleamine -N,N-dimethyl ; 2,2'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (Nmethyl-4,2-pyrrole)carbonylimino))-bis(4-thiazoleamine -N,N-dimethyl) : and the pharmaceutically acceptable salts thereof.
The compounds of formula (I) and the pharmaceutically acceptable salts thereof will be defined hereafter as the "compounds of the invention" or as the "active ingredients" of the pharmaceutical composition according to the present invention. The compounds of formula (I), and the salts thereof, can be prepared by a process comprising: a) reacting a compound of formula (II)
wherein n and B1 are as defined above, or a salt thereof, with a compound of formula (III)
wherein W' is =O or =S, and each of the X groups, which may be the same or different, is a leaving group, so as to obtain a compound of formula (I), in which W is =O or =S, m and n are the same and B and B1 are the same; or b) reacting a compound of formula (IV), or a salt thereof,
wherein B, X, W' and m are as defined above, with a compound of formula (II), as defined above, so as to obtain a compound of formula (I) wherein W is =O or =S; or c) reacting a compound of formula (V), or a salt thereof,
wiierei n 8 and m are as defined above, with a compound of formula (II), as defined above. so as to obtain a compound of formula (I), wherein W is =NH; and if desired, salifying a compound of formula (1) thus obtained; and/or if desired, obtaining a free compound of formula (I) from a salt thereof.
A salt of a compound of formula (II),(IV) and (V) may be A salt with organic or inorganic acids, for example those mentioned above, as to the pharmaceutically acceptable salts of the invention, the hydrochloride and hydrobromide salts being the preferred.
Preferred examples of good leaving groups, according to the meaning of X, are halogen atoms, in particular chlorine, or other easily displaceable groups such as, imidazolyl. triazolyl, p-nitrophenoxy or trich)orophe.noxy.
The reaction of a compound of formula (II), or a salt thereof with a compound of formula (III) is an analogy process and can be carried out according to well known methods; for example according to the conditions described in organic chemistry for this kind of reaction, i.e. for synthesis of urea derivatives. Preferably when in a compound of formula (III) X is an halogen atom, e.g. chlorine, the reaction may be carried out at a molar ratio of compound (it), or a salt thereof: compound (III) from about 1:1 to about 1:4.
The reaction is preferably performed in organic solvents such as dimethylsulphoxide, hexamethylphosphotriamide, dimethylacetamide or, preferably, dimethylformamide ,or their aqueous mixtures, or in water/dioxane or water/toluene mixtures, in the presence of either an organic base such as triethylamine or diisopropylethylamine, or an inorganic base such as sodium bicarbonate or sodium acetate.
The reaction temperature may vary from about 100 C. to about 500C. and the reaction time about I to about 12 hours.
The reaction of a compound of formula (IV), or a salt thereof, with a compound of formula (II), and the reaction of a compound of formula (V), or a salt thereof, with a compound of formula (II), respectively, can be performed by following the same procedure described above as to the reaction of a compound of formula (II), or a salt thereof, and a compound of formula (III). In particular the reaction temperature may range from room temperature to about 900 C.
The compounds of formula (I) prepared according to the above described procedures may be purified by conventional methods such as by silica gel or alumina column chromatography, and/or by recrystallization from organic solvents such as lower aliphatic alcohols or dimethylformamide.
Analogously salification of a compound of formula (I) can be carried out by known methods in the art.
The compounds of formula (II) may be obtained according to known procedures.
For instance, a compound of formula (II) may be obtained by reduction of a compound of formula (VI)
wherein n and B1 are as defined above by methods well known in the art. The compounds of formula (VI) may be obtained by reacting an amine of formula B1-NH2, where By is defined as above, with a compound of formula (VII) A
wherein n and X are as defined above.
Also the reaction of an amine of formula B1-NH2 with a compound of formula (VII) is a well known process.
Alternatively a compound of formula (VI) whereinnis 2 or 3 may be obtained by å multi-step-process comprising reacting a compound of formula (VIII)
wherein X is as defined above, with an amine of formula B1-NH2, in which B1 is as defined above. The reaction, which may be carried out according to known methods, -provides compounds of formula (IX)
wherein B1 is as defined above.
A compound of formula (IX) is reduced according to known methods to provide a compound of formula (X)
wherein B1 is as defined above, which in its turn is reacted with a compound of formula (VIII), as defined above, thus obtaining a compound of formula (VI), as defined above, wherein n is 2. If a compound of formula (VI), wherein n is 3 is desired, a further reduction and acylation step is required. The compounds of formula (VII) are known compounds and may be obtained for example according to Heterocycles, vol 27, No. 8, 1988, p. 1945-52.
The compounds of formula (VIII) and the amine of formula B-NH2 are known products or may be easily obtained according to known methods.
The compounds of formula (IV) may be obtained by reaction of a compound of formula (XI)
wherein m and B are as defined above, with an excess of the compounds of formula (III), the compounds of formula (XI) may be prepared analogously to the compound of formula (11).
The compounds of formula (III) are commercially available products. The compounds of formula (V) may be obtained by reaction of a compound of formula (XI), as defined above with a compound of formula (XII), X-C=N (XII) wherein X is as defined above, in particular chlorine or bromine.
Also compounds (XII) are commercially available products.
When in the intermediate products, herein described, groups are present which may interfere with the reaction, such groups are protected in a conventional way before the reaction takes place and then are deprotected at the end of the reaction, according to well known methods, typical protecting groups may be those used in the chemistry of peptides.
PHARMACOLOGY The compounds of the invention have been found to be active as angiogenesis inhibitors.
By angiogenesis inhibitor is meant an agent capable of suppressing -the growth of new blood vessels. Therefore the compounds of the present invention are useful in treating several pathological conditions in mammals, including humans, where the growth of new blood vessels is detrimental, for example in chronic inflammation, diabetic retinopathy, psoriasis, rheumatoid arthritis and tumour growth. In particular, in cancer therapy the compounds of the invention can be administered alone or in a combined method of treatment with antitumor agents such as doxorubicin, etoposide, fluorouracil, melphalan, cyclophosphamide, bleomycin, vinblastin or mitomycin.The term "combined" method of treatment is meant to include both separate and substantially contemporaneous administration of a pharmaceutical composition containing a therapeutically effective amount of a compound according to the invention and a pharmaceutical composition containing a therapeutically effective amount of a different pharmaceutically active agent. The angiogenesis inhibitor activity of the compounds of the present invention is shown e.g. by the fact that they have been found to be active in the chorioallantoic membrane test, according to the Folkman's method Nature, 279, 307 (1982). The compounds of the invention can be administered by the usual routes, for example, parenterally, e.g. by intravenous injection or infusion, intramuscularly, subcut: eously, topically or orally.The dosage depends on the age, weight and condition of the patient and on the administration route.
For example, a suitable dosage for administration to adult humans may range from about 0.5 to about 100 mg dry dose 1-4 times a day.
The pharmaceutical compositions of the invention may contain a compound of formula (I) or a pharmaceutically acceptable salt thereof as the active substance, in association with one or more pharmaceutically acceptable excipients and/or carriers.
The pharmaceutical compositions of the invention are usually prepared following conventional methods and are administered in a pharmaceutically suitable form.
For instance, solutions for intravenous injection or infusion may contain as carrier, for example, sterile water or preferably, they may be in the form of sterile aqueous isotonic saline solutions.
Suspensions or solutions for intramuscular injections may contain, together with the active compound, a pharmaceutically acceptable carrier, e.g. sterile water, olive oil, ethyl oleate, glycols, e.g. propylene glycol, and if desired, a suitable amount of lidocaine hydrochloride.
In formulations for topical application, e.g. creams, lotions or pastes for use in dermatological treatment, the active ingredient may be mixed with conventional oleaginous or emulsifying excipients.
The solid oral forr-, e.g. tablets and capsules, may contain, together with the active compound, diluents, e.g. lactose, dextrose, saccharose, cellulose, corn starch and potato starch; lubricants, e.g. silica, talc, stearic acid, magnesium or calcium stearate, and/or polyethylene gly ols; binding agents, e.g. starches, arabic gums, gelatin, methylcellulose, carboxymethyl cellulose, polyvinylpyrrolidone; disaggregating agents, e.g. a starch, alginic acid, alginates, sodium starch glycolate; effervescing mixtures; dyestuffs; sweeteners; wetting agents, for instance, lecithin, polysorbates, laurylsulphates: and, in general, non-toxic and pharmacologically inactive substances used in pharmaceutical formulations.Said pharmaceutical preparations may be manufactured in a known manner, for example by means of mixing, granulating, tabletting, sugar-coatig, or film-coating processes.
Furthemore, according to the invention there is provided a method of treating pathological conditions where the growth of neu blood vessels is detrimental, for example chronic inflaration, diabetic retinopathy, psosiaris, rheumatoid and arthritis and tumors, in mammals in need thereof, including humans, comprising administering to the said normals a composition of the invention.
The following examples illustrate but do not limit the invention.
Example 1 4,4t-(Carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonyl-imine (N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl-4,2 -pyrrolecarbonylimino(3-propianamidine)). dihydrochloride.
To a solution of N-deformyl Distamycin A dihydrochloride (576 mg, j mmol) in water (20 ml) and dioxane (10 ml), sodium bicarbonate (420 me, 5.mmols) is added under stirring.
The whele is cooled to 5 C wl with nice bath, then a solution of phosgene in toluene (1 ml#4 eg.) is added dropwise.
The mixture is stirred 3 hr at 50C.
The solvents is evaporated under vacuum and the residue is taken up with methanol and filtered. The filtrate is evaporated and the residue is chromatographed on a silica gel column with methylene chloride: methanol water 350:150:15 as eluent; affording 296 mg of the title compound.
N.M.R. (DMSO-d6) : 6 2,60(2H,t) ; 3.50 (2H, m) ; 3.79 (3H,s); 3.82 (3H,s) ; 3.83(3H, s) ; 6.80-7.25(6H,m); 8.22(1H,t) ; 8.58 (1H,bs) ; 8.60 (2H,bs) ; 8.95(2H,bs); 9.84 (1H,bs); 9,91 (1H, bs).
F.A.B.-M.S. : m/z 933, M4+1 ; 454,M-478.
U.V. (H2O)nm: # m@x (E1cm1%) 310(495); 242(435).
By analogous procedure the following compounds can be obtained: 4,4'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonyl-imino (N-methyl-4,2-pyrrole)carbonylimino)-bis(N-methyl-4,2 -pyrrolecarbonylimino(3-propyldimethylamine); and 4,4'-(carbonyl-bis.imino-N-methyl-4,2-pyrrolecarbonyl-imino)bis-(N-methyl-4,-2-pyrrolecarbonylimino(3-propianamidine)).
Example 2 4,4'-Thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl-4,2 -pyrrolecaronylimino(3-propianamidine)),dihydrochloride.
To a solution of N-deformyl Distamycin A dihydrochloride (1052 mg, 2 mmoles) in DMF (10 ml), 1,1'-thiocarbonyldiimidazole (178 mg, 1 mmol) is added under stirring. The mixture was stirred 2 hr at room temperature, and then 1 hr at 850C.
The solvent is evaporated under vacuum at 500C, the residue dissolved in methanol, acidified at pH 3 with 1N HCl, and evaporated to dryness.
The residue is chromatographed on a silica gel column with methylene chloride: methanol: water 350:150:15 as eluent, affording 650 mg of the.title compound N.M.R. (DMSO-d6): 6 2.61(2H,t); 3.51(2H,m); 3.80(3H,s); 3,83(3H,s); 3,85(3H,s); 6,8-7,35(6H,m); 8,22(1H,t); 8.63(2H,bs) ; 8,98(2H, bs); 9,65(1H,bs); 9,91(1H,bs); 9.92(1H,bs).
F.A.B.- M.S.: m/z 949, M++1; 879, M±70; 483;454.
UV(H2O)nm: # max (E1cm1%) 304(578) ; 244(469) I.R.(KBr)cm ; 3400b, 1690, 1635, 1580.
By analogous procedure the following compound can be obtained: 4,4'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino(N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl-4,2 -pyrrolecarbonylimino(3-propyldimethylamine)).
Example 3 4,4'-(1,3-guanidine-bis-(N-methyl-4,2-pyrrolecarbonyl-imino (N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl-4,2 -pyrrolecarbonylimino ( 3-propianamidine).
To a solution of or N-deformyl Distamycin A dihydrochloride (526 mg, 1 mmol) in water (15 ml) and dioxane (5 ml), sodium acetate (328 mg, 4 mmols) is added under stirring.
The whole is cooled to 50C with anice bath, then a solution of cyanogen bromide(212 mg, 2 mmols) in dioxane (10 ml) is added dropwise. The mixture is stirred 2 hrs at room temperature. The solvents are evaporated under vacuum and the residue chromatographed on a silica gel column with methylene chloride methanol: water, 350:150:15 as eluent, affording 248 mg of the title compound.
N.M.R. (DMSO-d6): 6 2,65(2H,t); 3,5(2H,m); 3,78(3H,s); .
.-.,79(3jH,s); 3,81(3H,s); 6,92-7,29(6H,M); 8,25(1H,t); 8,86(2H,bs); 9,12(2H,bs); 9,90(1H,bs); 10,01(1H,bs); F.A.B.-M.S.: m/z 932,M++1;; 861,M-70; 844,M-70-17 By analogous procedure the following compound can be obtained: 4,4(guanidine-bis-(N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl-4,2 -pyrrolecarbonylimino(3-propyldimethylamine)).
Example 4 8,8'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1-naphthalene- amine-N,N-dimethyl).
To a solution of 8-(amino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino)(1-dimethylaminonaphtha- lene)-hydrochloride(570 mg, 1.13 mmols) in N,N-dimethyl formamide (50 ml), trietylamine (0,3 ml, 2,26 mmols) is added under stirring. A solution of 1,1'-carbonyldiimidazole (100 mg, 0.06 mmols) in N,N'-dimethylformamide (15 ml) is added dropwise, in half an hour, at room temperature. The solution is stirred for 1 hr, then is evaporate under vacuum to dryness. The residue is taken up with methanol (30 ml), stirred for I hr and filtered.
The methanolic solution is evaporated and the residue is chromatographed on a silica gel column with ethyl acetate: methanol 20 : 10 as eluent, affording 200 mg of the title compound.
N.M.R. (DMS0): 6 2.90(6H,s); 3,80(3H,s); 3,96(3H,s); 6,80(1H,d); 6,92(1H,d); 7,00(1H,d); 7.25(1H,d); 7.40 + 7.80(5H,m); 8.78 + 8,88(1H,dd); 9.30(1h,bs); 1O.O0(lH,bs); 14.28(lh,bs).
By analogous procedure the following compounds can be obtained: 8,8'-Thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1-naphthaleneamine N,N-dimethyl); 5,5'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrolecarbonylimino))-bis(l-naphthaleneamine N,N-dimethyl); 5,5'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1-naphthaleneamine -N,N-dimethyl); 4,4'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1,8-naphthalenediamine-N,N,N',N'-tetramethyl); 4,4'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonyl imino(N-methyl-4,2-pyrrole@ carbonylimino))-bis(1,8-naphthalene- -diamine- N,N,N',N'-tetramethyl) ; 3,3'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1-phenyleneamine -N,N-dimethyl); 3,3-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino) )-bis(1-phenyleneamine N,N-dimethyl); 2,2'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(4-thiazoleamine -N,N-dimethyl)); and 2,2'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(A-thiazoleamine-N,N- -dimethyl).
Example 5 8-(Amino-N-methyl-4,2-pyrrolecarbonylimino(N-met.hyl-4,2- -pyrrole)carbonylimino)(1-dimethylaminonaphthalene) dihydrochloride.
The compound 8-(nitro-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino)(l-dimethylaminonaphtha- -lene)!(520 mg = 1.13 mmoles) is dissolved into a mixture of water (50 ml), dioxane (260 ml) and 2N HC1 (2 ml) and reduced over a Pd catalist (5% on carbon; mg 200) under H2 pressure (40 p.s.i.) for 4 hours.
The catalyst is filtered and the resulting solution is concentrated in vacuum to dryness, affording 500 mg of the title compound.
N.M.R. (DMSO-d6): # 2.90(6H,s); 3,88(3H,s); 3.90(3H,s); 7.03(1H,d) ; 7.09(1H,d) ; 7.25 - 7.80 (7H,m); 8.70-8.80(1H,dd); 10.15(4H,bs); 10.25(1H,bs); 14.20(1H,bs).
Example 6 8-(nitro-N-methyl-4,2-pyrrolecarbonyl-imino(N-methyl-4,2pyrrole)carbonylimino)-l-dimethylaminonaphthalene To a solution of 8-(amino-(N-methyl-4,2pyrrole)carbonylimino) (1-dimethylaminonaphthalene)dihydrochloride (725 mg, 1. 9 mmols) in dioxane (50 ml), water (20 ml) and triethylamine (0.8 ml, 5.7 mmols) is added dropwise under stirring at room temperature, a solution of (4-nitro-N-methyl-2-pyrrole) carbonyl chloride (360 mg, 1.9 mmols) in dioxane (15 ml).
The mixture is stirred 1 hr at room temperature and then evaporated under vacuum to dryness.
The residue is treated with methanol (30 ml), stirred for half an hour and filtred, to obtain the title compound (650mg).
N.M.R. (DM50-d6) : # 2,88(6H, s); 3.90(3H,s); 4.00(3H,s); 7,00(1H,d); 7,30(1H,d); 7,40-7,80; (6H,m) ; 8,15(1H,d); 8,75-8,85; (lH,dd) ; 10,30(1H,bs); 14,25(1H,bs); Example 7 8-(amino(N-methyl-4,2-pyrrole)carbonylimno)(1-dimethyl= aminonaphthalene ) dihydrochloride.
To a solution of 8-(nitro(N-methyl-4,2-pyrrole)carbonylimino) -1-dimethylaminonaphtalene (650 mg, 1.9 mmols) in dioxane (90 ml), water (lOml) and 2N HCL (3ml) is reduced over a Pd catalyst (5% on carbon, 400mg) under H2 pressure (40 p.s.i.) for 2 hr.
The catalyst is filtered and the resulting solution is concentrated in vacuum to dryness, affording 710 mg of the title compound.
N.M.R. (DMSO-d6): # 2.85(6H,s); 3.90(3H,s) ; 6,78(1H,d); 7,18(1H,d); 7.30-7.80(5H,m); 8.70-8.80(1H,dd); 10,28(4H,bs); 14,40(1H,bs); Example 8 8-(nitro(N-methyl-4,2-pyrrole)carbonylimino)-1-dimethyl= aminonaphthalene.
To a solution of 8-(nitro(N-methyl-4,2-pyrrole)carbonylimino) l-aminonaphthalene (620 mg, 2 mmols) in acetonitrile (10 ml), a 40% solution of formaldehyde in water (1.5 ml, 20 mmols) and sodium cyanobrorohydride (380 mg,6 mmols) are added under stirring at room temperature. Glacial acetic acid (0.3 ml), diluited with acetonitrile (5 ml), is added over 10 minute, and the reaction mixture is stirred at room temperature for 2 hrs.An additional 0.3 ml of glacial acetic acid is added, and stirring is continued for 30 minutes more.
The reaction mixture is poured into ethyl acetate (100 ml) and then washed with three 20-ml portions of 1N NaOH.
The organic solution id drie (Na2SO4) and evaporated in vacuum to dryness. Crystalization from 95% ethanol afforded the title compound (400 mg).
N.M.R. (DMSO-d6): # 2.80(6H,s); 4.00(3H,s); 7,25(1H,d); 7.35 7.85(5H,m) ; 8.23(1H,d); 8,63- 6.73(1H,dd); 14.60(1H,bs); Example 9 8-(nitro(N-methyl-4,2-pyrrole)carbonylimino)-1-aminonaphthalene.
To a solution of 1.8-diaminonaphthalene (1.58 g, 10 mmols), indioxane (100 ml), triethylamine (1.4 ml, 10 mmols) is added under stirring. A solution of (4-nitro-N-methyl-2pyrrole) carbonyl chloride (1.88 g, 10 mmols) indioxene (50 ml) is added dropwise, in 1 hr, at room temperature.
The mixture was stirred 2 hrs,then the reaction mixture is evaporated under vacuum to dryness. The residue is treated with water (200 ml) stirred for half an hour and filtred to obtain the title compound (2.45 g).
N.M.R. (DMSO-d6): # 4.05 (3H,s): 6.40-6.70(2H,m); 6.95-7.30(6H,m); 7.50(1H,d); 8.18(1H,d); 10.40(1H,bs).
I.R.(KBr) cm : 3440(b), 3350, 3120, 1630, 1615, 1600, 1480, 1330.
E.I.-M.S.: m/z: 310(M+ ), 292(M -H20).
Example 10 Intravenous injection 20mg/ml.
Ainjectable pharmaceutical preparation can be manufactured by dissolving 20 g of 4,4'-(carbonyl-bis(imino-n-methyl-4,2-pyrrolecarbonylimino (n-methyl-4,2-pyrrole)carbonylimino))-bis(n-methyl-4,2pyrrolecarbonylimino(3-propionamidine)), dihydrochloride in water for injection (1000 ml) and sealing ampoules of 1-10 m.l.

Claims (11)

CLAIMS:
1. A derivative of a substituted carboxypyrrole having the following formula (I)
where in W is =0, =S or =N-H each of m and n, being the same or different, is an integer of 1 to 4; each of B and B1, which may te the same-or different, is: a) a -(CH2)p-NR1R2 group, wherein p is an integer of 2 to 4 and each of %C1-C6 alkyl;R1 and R2, independently, is hydrogen or C1-C6 alkyl;
group, wherein g is an integer of 1 to 4; R3 is hydrogen and each of R4 and R5, independently, is hydrogen cr C1-Có alkyl; or R3 and =4, taken together, form a -CH=CH-, -CH2-CH2- or -CH2CH2-CH2- chain, and R5 is is hydrogen or C1-C6 alkyl; c) a saturated or unsaturated, carbocyclic or condensed carbocyclic ring substituted by one to three basic groups; or d) a saturated or unsaturated, heteromonocyclic or hetero bicyclic ring, containing one to three heteroatom chosen from nitrogen, oxygen and sulphur, substituted by one to three basic groups; and the pharmaceutically acceptable salts thereof, and wherein, when at the same time, W is =0, m and n being the same are 2, B and B1 are the same and as defined above under b), q is 2, then at least one of R4 and R5 is other then hydrogen.
2. A compound of formula (I), according to claim 1, wherein each of m and n,being the same, is 2 or 3; W is as defined in claim 1, each of B and B1, which are the same or different, is a') (CH2)pNR1R2 wherein p is 2 or 3 and each of R1 and R2 independently is hydrogen or C1-C4 alkyl;
wherein q is 2 or 3;R3, R4 and R5 are each hydrogen or R3 and R4, together, form a -CH2-CH2 -CH=CH- or -CH2-CH2-CH2- chain and R5 is hydrogen; c') a phenyl. or naphthyl group substituted by one, two or three basic groups chosen independently from
(CH2)rNR6R7 and
in which r is zero or an integer of 1 to 4 and each of R6 and R7, independently, is hydrogen or C1-C4 alkyl; or lA d') a thiazole, pyrimidine or tetrahydropyranyl ring substituted by one, two or three basic groups, as defined above under c'); and the pharmaceutically acceptable salts thereof, and wherein when, at the same time, W is =0, m and n are 2, B and B1 are the same and as defined above under b'),R3,R4and R5 are hydrogen, then q is 3.
3. A compound selected from 4,4 '-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl-4,2- pyrrolecarbonylimino(3-propionamidine)); 4,1'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl-4,2- pyrrolecarbonylimino(3-propionamidine)); 4,4 '-(thiocarbonyl-bis-(imino-N-methyl-4,2-pyrrolecarbonyli- mino(N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl-4,2pyrrole carbonylimino(3-propionamidine)); 4,4'-(thiocarbonyl-bis(imino-N-mehtyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(N-methyl-4,2 pyrrolecarbonylimino(3-propyldimenthylamine)); 4,4'-(1,3-guanidine-bis-(N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole) carbonylimino))-bis(N-methyl-4,2 pyrrolecarbonylirrino(3-propionamidine)); 4,4'(1,3-guanidine-bis-(N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(IN-methyl-4,2- pyrrolecarbonylïmino(3-propyldimethylamine)); 8,8'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-A, 2-pyrrole)carbonylimino) )-bis(l-naphthaleneamine- -N,N-dimethyl); 8,8'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(l-naphthaleneamine -N,N-dimethyl); 5,5'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1-naphthaleneamine -N,N-dimethyl); 5,5'-(thiocarbonyl-bis(imeno-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1-naphthaleneamine -N,N-dimethyl); 4,4'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-mesthyl-4,2-pyrrole)carbonylimino))-bis(1,8-naphthalenedia- mine-N,N,N',N' ,-tetramethyl); 4,4'-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1,8-naphthalenediamine -N,N,N',N'-tetramethyl); 3,3'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(1-phenyleneamine -N,N-dimethyl); 3,3'-tthiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino) )-bis(1-pheneyleamine -N,N-dimethyl); 2,2'-(carbonyl-bis(imino-N-methyl-4,2-pyrrolecarbonylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(A-thiazoleamine -N,N-dimethyl); 2,2-(thiocarbonyl-bis(imino-N-methyl-4,2-pyrrolecarbOnylimino (N-methyl-4,2-pyrrole)carbonylimino))-bis(4-thiazoleamine -N,N-dimethyl); and the pharmaceutically acceptable salts thereof.
4. A compound according to claim 3, which is a salt with hydrochloric or hydrobromic acid.
5. The use of a compound of formula (I)
wherein W is =0, =S or =N-H each of m and n, being the same or different, is an integer of 1 to 4; each of B and B1, which may be the same or cifferent, is: a) a -(CH2)p-NR2 group, wherein p is an integer of 2 to 4 and each of R1 and R2, independently, is hydrogen or C1-C6 alkyl;
group, wherein q is an-integer of 1 to 4; R3 is hydrogen and each of R4 and R5, independently, is hydrogen or C1-C6 alkyl; or R3 and R4, taken together, foa a -CH=CH, -CH2-CH2- or -CH2-CH2-CH2- chain, and R5 is hydrogen or C1-C6 alkyl; c) a saturated or unsaturated, carbocyclic or condensed carbocyclic ring substituted by one to three basic groups; or d) a saturated or unsaturated, heteromonocyclic or heterobi cyclic ring, containing one to three heteroatome chosen from nitrogen, oxygen, and sulphur, substituted by one to three basic groups; our a pharmaceutically acceptable salt thereof, in the preparation of a pharmaceutical for use as an angiogenesis inhibitor in mammals.
6. A process for the preparation of a compound of formula (I), as defined in claim 1, or a pharmaceutically acceptable salt thereof, said process comprising a) reacting a compound of formula (II)
wherein n and B1 are as refined in claim 1, or a salt thereof, with a compound of formula (III)
wherein W' is =O or =S, and each of the X groups, which may be the same or different, is a leaving group, so as to obtain a compound of formula (I), in which W is =O or -S, m and n are the same and B and B1 are the same; or b) reacting a compound of formula (IV), or a salt thereof,
wherein B and m are defined in claim 1 and X and W are as defined above, with a compound formula (II), as defined above, so as to obtain a compound of formula (I) wherein W is =O or =S; or c) reacting a compound of formula (V), or a salt thereof,
where in B and m are as defined in claim 1, with a compound of formula (II), as defined above, so as to obtain a compound of formula (I), wherein W is =NH; and if desired, obtaining a free compound of formula (I) from a salt thereof.
7. A pharmaceutical composition comprising a compound of formula (I), or a pharmaceutically acceptable salt thereof, as an active agent, and a pharmaceutically acceptable diluent and/or carrier.
8. A compound of formula (I) as defined in claim 1, or a pharmaceutically acceptable salt thereof, for use in a method of treatment of the human or animal body by surgery or therapy or of diagnosis practised on the human or animal body.
9. A compound or salt according to claim 8 for use as an angiogenesis inhibitor.
10. A process for the preparation of a compound of formula (I) as defined in claim 1, or a pharmaceutically acceptable salt thereof, said process being substantially as hereinbefore described in any one of Examples 1 to 9.
11. A pharmaceutical composition according to claim 7 and substantially as hereinbefore described in Example 10.
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