Fumagillol derivatives

Abstract: The present invention is related to a compound of the formula wherein R¹ is a 2-methyl-1-propenyl or isobutyl group which may be substituted and R² is (1) a substituted alkanoyl group, (2) a substituted aroyl group having at least one substituent selected from the group consisting of C₂₋₆ alkyl, amino, halogen, hydroxyl, lower alkoxy, cyano, carbamoyl and carboxyl, (3) an aromatic heterocycle-carbonyl, which may optionally be substituted, (4) a carbamoyl group, which may optionally be substituted, (5) an alkyl group, which may optionally be substituted, (6) a benzenesulfonyl group, which may optionally be substituted, (7) an alkylsulfonyl group, which may optionally be substituted, (8) a sulfamoyl group, which may optionally be substituted, (9) an alkoxycarbonyl group, which may optionally be substituted or (10) a phenoxycarbonyl group, which may optionally be substituted; or a salt thereof. The compound (I) has a strong angiogenesis inhibitory activity.

Description: This invention relates to novel O-substituted fumagillol derivatives or salts thereof, which have angiogenesis inhibitory activity and are effective in the treatment and prevention of various inflammatory diseases (rheunatism and psoriasis ), diabetic retinopathy and cancer. Angiogenesis is deeply concerned in the course of manifestation or progress of various diseases, for example various inflammatory diseases (rheumatism and psoriasis), diabetic retinopathy, and cancer. Therefore, to inhibit angiogenesis is considered to contribute to the treatment and prevention of such diseases. In fact, several groups of researchers have so far searched for angiogenesis inhibitory substances. As examples, there may be mentioned the study by Taylor et al. [Taylor, S. et al., Nature, 297 , 307 (1982)] on the applicability of protamine and the study by Folkman et al. [Folkman, J. et al., Science, 221 , 719 (1983)] on the combined use of heparin and cortisone. Furthermore, patent applications have been filed alleging, for example, that ascorbic acid ethers and related compounds (Japanese Kokai Tokkyo Koho No. 58-131978) and the sulfated polysaccharide DS4152 (Japanese Kokai Tokkyo Koho No. 63-119500) show angiogenesis inhibitory activity. However, such substances are not yet fully satisfactory from the activity viewpoint. The advent of compounds superior in activity is waited for. Accordingly, it is an object of the invention to provide novel compounds having angiogenesis inhibitory activity. The present inventors searched for and evaluated various compounds in an attempt to achieve the above object and, as a result, found that O-substituted derivatives of fumagillol, a hydrolyzate of fumagillin so far known as an antimicrobial and antiprotozoal agent, have potent angiogenesis inhibitory activity. Fumagillin itself is reported to have antitumor activity (CA, Vol. 70, no. 9 page 206, abstract no. 176153y). Based on this finding, they have now completed the present invention. Thus, the invention relates to O-substituted fumagillol derivatives (hereinafter sometimes referred to as compounds (I) for short) of the formula wherein R 1 is a 2-methyl-1-propenyl or isobutyl group which may be substituted with hydroxy or di-C 1-3 alkylamino, and R 2 is a carbamoyl group substituted with one or two groups selected from C 1-6 alkanoyl which may be unsaturated, monochloroacetyl, dichloroacetyl, C 1-6 alkoxycarbonylmethyl, carboxymethyl, amino, phenyl substituted with one to five groups selected from C 1-6 alkoxy, haloalkyl and nitro , naphthyl, benzoyl, imidazolyl (together with the carbamoyl nitrogen atom), halogenated C 1-6 alkyl, di-C 1-6 alkylamino-C 1-6 alkyl, C 1-6 alkanoyloxy-C 1-6 alkanoyl, C 1-6 alkanoylthio-C 1-6 alkanoyl, C 1-6 alkylthio-C 1-6 alkanoyl, arylthio-C 1-6 alkanoyl, aromatic heterocyclicthio-C 1-6 alkanoyl, N-oxy-2-pyridylthio-C 1-6 alkanoyl, N-C 1-6 alkyl-4-pyridiniothio-C 1-6 alkanoyl halide, di-C 1-6 alkylamino-C 1-6 alkanoyl, ammonio-C 1-6 alkanoyl halide, aromatic heterocyclic carbonyl, C 1-6 alkoxycarbonyl, phenoxycarbonyl, chloroacetylcarbamoyl, benzoylcarbamoyl, phenylsulfonyl (unsubstituted or substituted with one to five C 1-6 alkyl groups) and di(C 1-6 alkyl) sulfonio-C 1-6 alkanoyl halide; or a salt thereof. Referring to the above formula, the optional substituent on the 2-methyl-1-propenyl or isobutyl group represented by R 1 is hydroxy or di-C 1-3 alkylamino (e.g. dimethylamino, diethylamino). Particularly preferable is hydroxy and dimethylamino. The substituted carbamoyl group represented by R 2 includes monosubstituted carbamoyl and disubstituted carbamoyl. As the substituents, there may be mentioned, for example, C 1-6 alkanoyl which may be unsaturated (e.g. acetyl, propionyl, acryloyl, methacroyl), monochloroacetyl, dichloroacetyl, C 1-6 alkoxycarbonylmethyl (e.g. methoxycarbonylmethyl, ethoxycarbonylmethyl), carboxymethyl, amino, phenyl which is substituted with C 1-6 alkoxy, haloalkyl or nitro, naphthyl, benzoyl, and imidazol-1-yl (formed together with the carbamoyl nitrogen atom). Preferred among them are monochloroacetyl and benzoyl. The substituent of carbamoyl further includes halogenated C 1-6 alkyl (e.g. 2-chloroethyl, 2-bromoethyl, 3-chloropropyl), di-C 1-6 alkylamino-C 1-6 alkyl (e.g. 2-dimethylaminoethyl, 2-diethylaminoethyl, 3-dimethylaminopropyl), alkanoyloxy-C 1-6 alkanoyl (e.g. acetoxyacetyl, propionyloxyacetyl), C 1-6 alkanoylthio-C 1-6 alkanoyl (e.g. acetylthioacetyl, propionylthioacetyl), C 1-6 alkylthio-C 1-6 alkanoyl (e.g. methylthioacetyl, ethylthiopropionyl), arylthio-C 1-6 alkanoyl (e.g. phenylthioacetyl, naphthylthioacetyl), aromatic heterocyclicthio-C 1-6 alkanoyl (e.g. 4-pyridylthioacetyl , 2-pyridylthioacetyl, 2-benzothiazolylthioacetyl, 2-benzoxazolylthioacetyl, 2-benzoimidazolylthioacetyl, 8-quinolylthioacetyl, [1-(2-dimethylaminoethyl)tetrazol]-5-ylthioacetyl, 2-methyl-1,3,4-thiadiazol-5-ylthioacetyl, 1-methyl-2-methoxycarbonyl-1,3,4-triazol-5-ylthioacetyl), N-oxy-2-pyridylthio-C 1-6 alkanoyl (e.g. N-oxy-2-pyridylthioacetyl), N-C 1-6 alkyl-4-pyridiniothio-C 1-6 alkanoyl·halide (e.g. N-methyl-4-pyridinoacetyl·iodide), di C 1-6 alkylamino-C 1-6 alkanoyl (e.g. dimethylaminoacetyl, diethylaminoacetyl), ammonio-C 1-6 alkanoyl·halide (e.g. trimethylammonioacetyl·iodide, N-methylpyrrolidinoacetyl.chloride), aromatic heterocyclic-carbonyl (e.g. 3-furoyl, nicotinoyl, 2-thenoyl), C 1-6 alkoxycarbonyl (e.g. methoxycarbonyl, ethoxycarbonyl), phenoxycarbonyl, chloroacetylcarbamoyl, benzoylcarbamoyl, phenylsulfonyl (unsubstituted or substitute with one to five C 1-6 alkyl groups; e.g. benzensulfonyl, toluensulfonyl) and di(C 1-6 alkyl)sulfonio-C 1-6 alkanoyl·halide (e.g. dimethylsulfonioacetyl.iodide). In this specification, the substituent or substituents on the "substituted phenyl" group include, among others, C 1-6 lower alkoxy (e.g. methoxy, ethoxy and propoxy ), haloalkyl (e.g. trifluoromethyl, chloromethyl,and bromomethyl ) and nitro. The phenyl ring may have one to five such substituents at any optional position or positions. In this specification, unless otherwise specified, the term "C 1-6 alkyl" or "C 1-6 alkyl group" means a straight or branched alkyl group containing 1 to 6 carbon atoms and the term "C 1-6 alkoxy" or "C 1-6 alkoxy group" means an alkoxy group containing 1 to 6 carbon atoms, preferably 1 to 3 carbon atoms. The compounds (I) according to the invention may be used in the form of pharmaceutically acceptable salts if they have an acidic substituent (e.g. carboxyl) or a basic substituent (e.g. amino, and di-C 1-3 alkylamino). Said pharmaceutically acceptable salts may include salts with inorganic bases, salts with organic bases, salts with inorganic acids, salts with organic acids and salts with basic or acidic amino acids, among others. Available for the formation of such salts are such inorganic bases as alkali metals (e.g. sodium and potassium) and alkaline earth metals (e.g. calcium and magnesium), such organic bases as trimethylamine, triethylamine, pyridine, picoline, N,N-dibenzylethylenediamine, ethanolamine, diethanolamine, trishydroxymethylaminomethane and dicyclohexylamine, such inorganic acids as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid and phosphoric acid, such organic acids as formic acid, acetic acid, trifluoroacetic acid, oxalic acid, tartaric acid, fumaric acid, maleic acid, methanesulfonic acid, benzenesulfonic acid and p-toluenesulfonic acid, and such basic on acidic amine acids as arginine, lysine, ornithine, aspartic acid and glutamic acid. Among these salts, the salts with bases (i.e. salts with inorganic bases, salts with organic bases and salts with basic amino acids) are those salts in which the carboxyl group contained in a substituent in compounds (I) is involved in the salt formation while, in the salts with acids (i.e. salts with inorganic acids, salts with organic acids and salts with acidic amino acids), an amino, lower alkylamino or di-lower alkylamino group, among others, contained in a substituent in compounds (I) is involved in the salt formation. The O-substituted fumagillol derivatives in which R 1 in formula (I) is a 2-methyl-1-propenyl group can be produced by subjecting fumagillol [Tarbell, D. S. et al., J. Am. Chem. Soc., 83 , 3096 (1961)], which is a hydrolyzate of fumagillin produced by microorganisms, to carbamoylation using an carbamoylating agent in the manner mentioned below, or by isolating intermediates in such a reaction. The O-substituted dihydrofumagillol derivatives in which, in formula (I), R 1 is an isobutyl group can be produced by subjecting 4',5'-dihydrofumagillol (II), which is obtainable by catalytically reducing fumagillol under ordinary conditions (e.g. using 5% palladium-carbon in a methanol solution; cf. Reference Example 1), to the same reaction as mentioned above. In cases where R 2 it a group inert to catalytic reduction, it is also possible to convert the O-substituted fumagillol derivatives in which R 1 is a 2-methyl-1-propenyl group to the O-substituted dihydrofumagillol derivatives in which R 1 is an isobutyl group by catalytic reduction. Those O-substituted fumagillol derivatives of formula (I) in which R 1 is a hydroxy -substituted 2-methyl-1-propenyl or isobutyl group can be produced by subjecting fumagillol whose 6-position hydroxyl may be protected to oxidation for introduction of a hydroxy group thereinto, and then subjecting the oxidation product, after deprotection of the 6-position hydroxyl, to carbamoylation or by isolating the respective reaction intermediates. In cases where R 2 is a group inert to oxidation, the O-substituted fumagillol derivatives just mentioned above can be produced also by subjecting those O-sustituted fumagillol derivatives of formula (I) in which R 1 is a 2-methyl-1-propenyl or isobutyl group directly to oxidation. Those O-substituted fumagillol derivatives of formula (I) in which R 1 is a di-C 1-3 alkylamino-substituted 2-methyl-1-propenyl or isobutyl group can be produced by subjecting the above-mentioned fumagillol derivatives having a hydroxyl group introduced in the 4-position side chain moiety, 2-methyl-1-propenyl or isobutyl group, by the above-mentioned oxidation, the 6-position hydroxyl of which may be protected, to amination and then subjecting the amination product, after deprotection of the 6-position hydroxyl, to carbamoylation, or by isolating the respective reaction intermediates. In cases where R 2 is a group inert or resistant to amination, the O-substituted fumgillol derivatives just mentioned above can be produced also by subjecting an O-substituted fumagillol derivative of formula (I) in which R 1 is a hydroxy -substituted 2-methyl-1-propenyl or isobutyl group to amination. Those O-substituted fumagillol derivatives of formula (I) in which R 1 is a hydroxy -, or di-C 1-3 alkylamino- substituted isobutyl group can be produced by subjecting a fumagillol derivative having a hydroxy, or di-C 1-6 alkylamino group introduced in the 4-position side chain moiety 2-methyl-1-propenyl group, the 6-position hydroxyl of which may be protected, to catalytic reduction and then subjecting the reduction product, after deprotection of the 6-position hydroxyl as necessary, to carbamoylation, or by isolating the respective reaction intermediates. In the step of carbamoylation, the reaction can proceed with advantage when the hydroxy, group in R 1 is protected as necessary. In cases where R 2 is a group inert to catalytic reduction, the O-substituted fumagillol derivatives just mentioned above can be produced also by sujecting those O-sustituted fumagillol derivatives of formula (I) in which R 1 is a 3-hydroxy-2-methyl-1-propenyl group directly to catalytic reduction. The protection and deprotection of the 6-position hydroxyl and of the hydroxyl in R 1 can be carried out by an appropriate per se known method [cf. Greene, T. W., "Protective Groups in Organic Synthesis", John Wiley & Sons, New York (1981)]. In cases where such a substituent as amino, hydroxyl or carboxyl is present in the carbamoylating agent, such substituent should preferably be protected by an appropriate protective group selected on the basis of the stability of the product. As examples of preferred protective groups, there may be mentioned 4-nitrobenzyloxycarbonyl and 2-trimethylsilylethoxycarbonyl for amino protection, 4-nitrobenzyl and t-butyldimethylsilyl for hydroxyl protection, and 4-nitrobenzyl for carboxyl protection. Deprotection can be effected by a conventional method, for example by catalytic reduction or reaction with the fluoride ion. In the case of carbamoylation, it is also possible to use a C 1-6 alkyl group, such as methyl or ethyl, as the carboxyl-protecting group so that postreaction deprotection can be effected by hydrolysis under mild alkaline conditions. The carbamoylation reaction for the introduction of a monosubstituted carbamoyl group is carried out generally by bringing the starting alcohol into contact with an isocyanate, for example according to the following equation: R 5 NCO + Starting alcohol → Compound (I) [R 2 = R 5 NHCO] In the above equation, R 5 is a C 1-6 alkanoyl or chloroacetyl substituent on the substituted carbamoyl represented by R 2 . Said isocyanate is used generally in an amount of 1 to 5 moles per mole of the starting alcohol. This reaction is carried out generally in the presence of a base. Usable as said base are teriary amines, such as diisopropylethylamine, triethylamine, pyridine and N,N-dimethylaminopyridine, alkali metal hydrogen carbonates, such as sodium hydrogen carbonate and potassium hydrogen carbonate, alkali metal carbonates, such as potassium carbonate and sodium carbonate, alkali metal hydrides, such as sodium hydride and potassium hydride, and organometals, such as butyllithium and lithium diisopropylamide. The level of addition of said base is generally 1 to 5 moles per mole of the starting alcohol. This reaction is carried out generally in an organic solvent which will not interfere with the reaction. Usable as such inert organic solvent are for example amides, such as dimethylformamide and dimethylacetamide, halogenated hydrocarbons, such as dichloromethane, chloroform and 1,2-dichloroethane, ethers, such as diethyl ether, tetrahydrofuran and dioxane, esters, such as methyl acetate, ethyl acetate, isobutyl acetate and methyl propionate, nitriles, such as acetonitrile and propionitrile, nitro compounds, such as nitromethane and nitroethane, ketones, such as acetone and methyl ethyl ketone, and aromatic hydrocarbons, such as benzene and toluene. These may be used either singly or in the form of a mixture or two or more of them mixed together in an appropriate ratio. When a tertiary amine is used as the base, said tertiary amine as such may also serve as a solvent. The optimal reaction temperature may depend on the isocyanate, base and solvent and amounts thereof but is generally within the range of -80°C to 100°C, preferably from 0°C to room temperature. The reaction time required amounts to 1 hour to 5 days. Said carbamoylation may also be effected by reacting the starting alcohol with a carbamoyl halide. Said carbamoyl halide is used generally in an amount of 1 to 5 moles per mole of the starting alcohol. This reaction is carried out generally in the presence of a base. Usable as the base are those tertiary amines, alkali metal hydrogen carbonates, alkali metal carbonates, alkali metal hydrides and organoalkali metals mentioned above. The level of addition of said base is generally 1 to 5 moles per mole of the starting alcohol. This reaction is carried out generally in an organic solvent which will not interfere with the reaction. Usable as such inert organic solvent are those amides, halogenated hydrocarbons, ethers, esters, nitriles, nitro compounds, ketones and aromatic hydrocarbons mentioned above. These may be used either singly or in the form of a mixture, in an appropriate mixing ratio, of two or more of them. When a tertiary amine is used as the base, said tertiary amine as such may also serve as a solvent. The optimal reaction temperature may vary depending on the carbamoyl halide, base and solvent and amounts thereof. Generally, however, the reaction is carried out at a temperature from 0°C to a temperature approximately equal to the refluxing temperature of the reaction medium, preferably from 25°C to the refluxing temperature. Further, said carbamoylation can be effected by reacting the starting alcohol with a chloroformate ester (e.g. phenyl chloroformate or ethyl chloroformate, isobutyl chloroformate, 1-chloroethyl chloroformate) or 1,1-carbonyldiimidazole and then reacting the resulting active ester with a primary or secondary amine. Said chloroformate ester, 1,1-carbonyldiimidazole or amine is used generally in an amount of 1 to 5 moles per mole of the starting alcohol. In the process mentioned just above, the reaction of the starting alcohol with a chloroformate ester is carried out generally in the presence of a base. Usable as said base are those tertiary amines, alkali metal hydrogen carbonates, alkali metal carbonates, alkali metal hydrides and organoalkali metals mentioned above. The level of addition of the base is generally 1 to 5 moles per mole of the starting alcohol. This reaction is carried out generally in an organic solvent which will not interfere with the reaction. Usable as such inert organic solvent are the amides, halogenated hydrocarbons, ethers, esters, nitriles, nitro compounds, ketones and aromatic hydrocarbons mentioned above. These may be used either singly or in the form of a mixture, in an appropriate mixing ratio, of two or more of them. The optimal reaction temperature may vary depending on species of chloroformate ester, base, amine and solvent and amounts thereof, among others. Generally, however, the reaction is carried out at a temperature from -20°C to the refluxing temperature of the reaction medium, preferably at a temperature of 0°C to 50°C. Among the compounds having a mono-substituted carbamoyl group, those having a substituted C 1-6 alkanoylcarbamoyl group can be produced also by reacting a corresponding compound having a monochloroacetylcarbamoyl group with a nucleophilic reagent. The nucleophilic reagent to be used is a lower carboxylic acid, lower thiocarboxylic acid, thiol or amine or a metal salt thereof. This reaction is generally carried out in an organic solvent which will not interfere with the reaction. The above-mentioned saturated aliphatic hydrocarbons, alcohols, amides, halogenated hydrocarbons, ethers, esters, nitriles, nitro compounds, ketones and aromatic hydrocarbons, for instance, can be used as such organic solvent inert to the reaction. These may be used either singly or in the form of a mixture of two or more in an appropriate mixing ratio. Generally, this reaction is carried out in the presence of a base. Usable as said base are, for example, the above-mentioned tertiary amines, alkali metal hydrogen carbonates, alkali metal carbonates, alkali metal hydrides and organoalkali metal compounds. The base is added to the reaction system generally in an amount of 1 to 5 moles per mole of the starting material. The optimal reaction temperature may vary depending on the nucleophilic reagent, base and solvent, the quantities thereof and other factors. Generally, however, the reaction is carried out at -80°C to 100°C, preferably at 0°C to room temperature. The reaction period is 20 minutes to 5 days. In the present invention the oxidation is effected by reacting an oxidizing agent with fumagillol, whose 6-position hydroxyl may be protected, or an 0-substituted fumagillol derivative of formula (I) in which R 1 is a substituted or unsubstituted 2-methyl-1-propenyl or isobutyl group and the 6-position hydroxyl of which may be protected. Usable oxidizing agents are selenium dioxide, osmium tetroxide, aqueous hydrogen peroxide, organic peroxides (e.g. t-butyl hydroperoxide) and organic peracids (e.g. performic acid, peracetic acid, trifluoroperacetic acid, perbenzoic acid or m-chloroperbenzoic acid). It is also possible to use two or more of these in combination in an appropriate mixing ratio. Generally, the oxidizing agent is used in an amount of 1 to 5 moles per mole of the starting material. This reaction is generally carried out in a solvent which will not interfere with the invention. Useful examples of such solvent inert to the reaction are water, saturated aliphatic hydrocarbons, such as hexane and heptane, alcohols, such as methanol and ethanol, and the above-mentioned halogenated hydrocarbons, ethers and aromatic hydrocarbons. These may be used either singly or in the form of a mixture of two or more of them in an appropriate mixing ratio. The optimal reaction temperature may vary depending on the oxidizing agent and solvent, the quantities thereof and other factors. Generally, however, the reaction is carried out at -80°C to 100°C, preferably at 0°C to room temperature. The reaction period is 20 minutes to 5 days. The amination is conducted for conversion of the hydroxyl group of the fumagillol derivatives having a hydroxyl group introduced in the 4-position side chain, 2-methyl-1-propenyl or isobutyl group, as a result of the above oxidation reaction, the 6-position hydroxyl of which may be protected, or of those O-substituted fumagillol derivatives of general formula (I) in which R 1 is a hydroxyl-substituted 2-methyl-1-propenyl or isobutyl group by the method of converting hydroxyl directly to amino by taking advantage of the Mitunobu reaction (cf. Mitunobu, O., Synthesis, 1981 , 1) which uses an imide, such as phthalimide or succinimide, the method which comprises converting said hydroxyl to methanesulfonyloxy or toluenesulfonyloxy and then convering the latter to an amino, C 1-3 alkylamino or di-(C 1-3 alkyl)amino, or some other appropriate method. For the reaction of the sulfonyloxy derivative with ammonia or an amine, aqueous ammonia, gaseous ammonia or liquid ammonia may be used as ammonia and the amine to be used is a primary amine (e.g. methylamine, ethylamine, isopropylamine, or a secondary amine (e.g. dimethylamine and diethylamine). Generally, this reaction is carried out using ammonia or said amine in an amount of 1 to 20 moles, preferably 2 to 10 moles per mole of the starting material in a solvent which will not adversely affect the reaction. The ammonia or amine itself may be used as the solvent. Useful as the solvent which will not adversely affect the reaction are, for example, water and such saturated alipahtic hydrocarbons, alcohols, amides, halogenated hydrocarbons, ethers, esters, nitriles, nitro compounds, ketones and aromatic hydrocarbons as mentioned above. These may be used either singly or in the form of a mixture of two or more in an appropriate mixing ratio. This reaction may also be carried out in the presence of a base, such as an alkali metal hydrogen carbonate or an alkali metal carbonate. Those alkali metal hydrogen carbonates and alkali metal carbonates mentioned above referring to the carbamoglation can be used also for this reaction. The optimal reaction temperature may vary depending on the reactant (ammonia or amine), base and solvent, the quantities thereof and other factors. Generally, however, the reaction is carried out at -80°C to 100°C, preferably at 0°C to room temperature. The reaction period is 20 minutes to 5 days. The amino or C 1-3 alkylamino introduced by the above-mentioned method is then N-alkylated according to a per se known method [cf.Sutherland, I. O. (ed.), "Comprehensive Organic Chemistry", vol. 2, pages 4-11, Pergamon Press (1979)] to give those fumagillol derivatives which have a di-C 1-3 alkyl)amino group introduced in the 4-position side chain, 2-methyl-1-propenyl or isobutyl group, and whose 6-position hydroxyl may be protected or those O-substituted fumagillol derivatives of general formula (I) in which R 1 is a di-C 1-3 alkyl)amino-substituted 2-methyl-1-propenyl or isobutyl group. The O-substituted fumagillol derivatives (I) thus produced can be isolated by per se known means of separation and purification (e.g. chromatography, crystallization) or by other appropriate means. The compounds (I) have asymmetric centers within their molecules and accordingly are optically active. Their absolute configuration comes from the starting material fumagillol. Therefore, it is to be noted that the compounds (I) have the same absolute configuration that fumagillol has. The compounds according to the invention exhibit angiogenesis inhibitory activity and are useful as therapeutic and prophylactic agents for various inflammatory diseases (rheumatism, psoriasis), diabetic retinopathy, or cancer. They can be safely administered either orally or nonorally as such or in the form of pharmaceutical preparations [e.g. tablets, capsules (inclusive of soft capsules and microcapsules), solutions, injections, suppositories] prepared by admixing with per se . known pharmaceutically acceptable carriers or excipients. The dose may vary depending on the target of administration, route of administration, symptoms and other factors. Generally, however, in adults, they are used, for example, at a dose of 0.1 mg/kg to 40 mg/kg body weight, preferably 0.5 mg/kg to 20 mg/kg body weight. Experimental Example 1 The product compounds (I) obtained in the examples given below were evaluated for angiogenesis inhibitory activity by the rat cornea micropocket method. The data obtained are summarized in the table given below. Method of measurement Essentially the method of Gimbrone et al. [J. National Cancer Institute, 52 , 413-419 (1974)] was followed. Thus, adult male Sprague-Dawley rats (11 to 16 weeks of age) were anesthetized with nembutal and locally anesthetized by instillation of xylocaine eyedrops onto the eyeball. The cornea was incised to a length of about 2 mm at about 2 mm inside from the corneal circumference by means of an injection needle, and a sustained release pellet containing basic fibroblast growth factor (bFGF; bovine brain-derived, purified product; R & D) and a sustained release pellet containing the test sample were inserted side by side into the incision so that the bFGF pellet was located on the central side in the cornea. In the control group, the bFGF pellet and a sample-free pellet were inserted into the cornea. After 7 days and after 10 days, the cornea was observed under a stereoscopic microscope. When the sample administration resulted in retardation or reduction of bFGF-induced angiogenesis, the sample was judged to have inhibitory activity. The sustained release pellets were prepared in the following manner. An ethylene-vinyl acetate copolymer (Takeda Chemical Industries) was dissolved in dichloromethane to a concentration of 8%. A 3-µl portion of the solution was air-dried on a glass dish, an aqueous solution of bFGF (250 ng) was then placed thereon and air-dried and, finally 3 µl of the above ethylene-vinyl acetate copolymer solution was placed further thereon and air-dried to give a laminate consisting of two copolymer layers and a bFGF layer sandwiched therebetween. This sandwich sheet was made round into a bFGF pellet. The test sample pellets were prepared by dissolving each sample in ethanol in a concentration of 20 µg/2 µl, mixing the solution (2 µl) with 6 µl of an ethylene-vinyl acetate copolymer solution, air-drying the mixed solution on a glass dish and making the thus-obtained sheet round. In the above table, the inhibition rate is the ratio of the number of rats in which angiogenesis inhibitory activity was observed to the number of rats tested. Examples The following reference examples and examples are further illustrative of the present invention. In the following reference examples and examples, elution in column chromatography (the eluent being given in the parentheses) was performed under TLC (thin layer chromatography) observation. In TLC observation, Merck kieselgel 60F 250 (70-230 mesh) was used for preparing TLC plates and the solvent used as the eluent in column chromatography was used also as the developing solvent. For detection, a UV detector or coloration with phosphomolybdic acid, for example, was used. Merck kieselgel 60 (70-230 mesh) was used also as the column packing silica gel. Each NMR spectrum is a proton NMR ( 1 H-NMR) spectrum measured on a Varian model Gemini 200 NMR spectrometer with tetramethylsilane as an internal or external standard and reported in terms of δ values in ppm. In the reference examples and examples, the following abbreviations are used: s: singlet; br: broad; d: doublet; dd: double doublet; ddd: doublet doublet doublet; t: triplet; q: quartet; m: multiplet; ABq: AB quartet; J: coupling constant; Hz: hertz; CDCl 3 : deuteriochloroform; d 6 -DMSO: deuterated dimethyl sulfoxide; %: % by weight. In the following reference examples and examples, the term "room temperature" means 15-25°C. The melting point and temperature data are all given on the Celsius scale. Reference Example 1 Dihydrofumagillol A solution of fumagillol (1.12 g) in ethanol (13 ml) was subjected to catalytic reduction at atmospheric pressure and room temperature for 1 hour, using 5% palladium-on-carbon (120 mg) as the catalyst. The reaction mixture was filtered, the filtrate was concentrated under reduced pressure, and the residue was purified by silica gel chromatography (eluent: n-hexane-ethyl acetate = 2:1) to give 871 mg (77% yield) of dihydrofumagillol, a compound described in J. Am. Chem. Soc., 78 , 4675 (1956). Example 1 O-Chloroacetylcarbamoylfumagillol To a solution of fumagillol (314 mg) in dichloromethane (5 ml) was added dropwise chloroacetyl isocyanate (160 mg) under ice cooling, followed by addition of dimethylaminopyridine (130 mg). The mixture was stirred at 0°C for 2 hours. To this reaction mixture was added water and the mixture was extracted with dichloromethane. The organic layer was washed with saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was subjected to silica gel column chromatography. The eluate obtained with a mixture of n-hexane and ethyl acetate (3:1) was concentrated under reduced pressure to give colorless, powdery O-chloroacetylcarbamoylfumagillol (318 mg) (71% yield). 1 H-NMR (CDCl 3 ) δ: 1.10 (1H, m), 1.21 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.93 (1H, d, J=11.4 Hz), 1.8-2.5 (5H, m), 2.57 (lH, d, J=4.2 Hz), 2.58 (1H, m) 2.99 (1H, d, J=4.2 Hz), 3.47 (3H, s), 3.68 (1H, dd, J=11.4 Hz, J=2.8 Hz), 4.44 (2H, s), 5.20 (1H, m), 5.61 (1H, m), 8.33 (1H, br s). Example 2 Sodium salt of O-carboxymethylcarbamoylfumagillol In the same manner as in Example 1, fumagillol (242 mg) was reacted with ethyl isocyanatoacetate (135 mg) with stirring at room temperature for 24 hours. Purification by silica gel column chromatography (n-hexane:ethyl acetate = 3:1) gave colorless, oily O-ethoxycarbonylmethylcarbamoylfumagillol. 1 H-NMR (CDCl 3 ) δ: 1.08 (1H, m), 1.21 (3H, s), 1.29 (3H, t, J=7.2 Hz), 1.65 (3H, s), 1.74 (3H, s), 1.5-2.5 (6H, m), 2.55 (lH, d, J=4.2 Hz), 2.58 (1H, t, J=6.7 Hz), 2.98 (1H, d, J=4.2 Hz), 3.45 (3H, s), 3.63 (1H, dd, J=11.2 Hz, J=2.6 Hz), 3.87 (1H, dd, J=18.6 Hz, J=4.8 Hz), 4.06 (1H, dd, J=18.6 Hz, J=6.0 Hz), 4.22 (2H, q, J=7.2 Hz), 5.15-5.35 (2H, m), 6.00 (1H, m). To a solution of O-ethoxycarbonylmethylcarbamoylfumagillol in ethanol (3 ml) was added 1 N sodium hydroxide (2 ml) and the mixture was stirred at room temperature for 2 hours. The reaction mixture was concentrated under reduced pressure, water was added to the residue and the mixture was washed with ethyl acetate. The aqueous layer was adjusted to pH 3 with oxalic acid and extracted with ethyl acetate. The extract was dried over anhydrous magnesium sulfate. Then the solvent was distilled off under reduced pressure to give light yellow, powdery O-carboxymethylcarbamoylfumagillol (251 mg) (76% yield). 1 H-NMR (CDCl 3 ) δ: 1.07 (1H, m), 1.22 (3H, s), 1.64 (3H, s), 1.75 (3H, s), 1.5-2.5 (6H, m), 2.56 (1H, d, J=4.2 Hz), 2.68 (1H, m), 2.97 (1H, d, J=4.2 Hz), 3.44 (3H, s), 3.68 (1H, dd, J=11.2 Hz, J=2.6 Hz), 3.99 (2H, m), 5.19 (1H, m), 5.47 (1H, m), 5.62 (1H, m) To O-carboxymethylcarbamoylfumagillol (130 mg) was added water (1 ml), followed by portionwise addition of sodium hydrogen carbonate (40 mg) for dissolving the starting material. The solvent was distilled off under reduced pressure to give colorless, powdery sodium salt of O-carboxymethylcarbamoylfumagillol (135 mg) (98% yield). m.p.: gradual decomposition above 200°C 1 H-NMR (D 2 O) δ: 1.10 (1H, m), 1.23 (3H, s), 1.68 (3H, s), 1.77 (3H, s), 1.5-2.5 (6H, m), 2.78 (1H, d, J=3.2 Hz), 2.90 (1H, m), 3.12 (1H, d, J=3.2 Hz), 3.45 (3H, s), 3.70 (2H, s), 3.84 (1H, dd, J=11.5 Hz, J=2.6 Hz), 5.29 (1H, m), 5.49 (1H, m). Example 3 O-(m-Trifluoromethylphenylcarbamoyl)fumagillol In the same manner as in Example 1, fumagillol (208 mg) was reacted with m-trifluoromethylphenyl isocyanate (207 mg) with stirring at room temperature for 15 hours. Purification by silica gel column chromatography (n-hexane: ethyl acetate = 4:1) gave colorless, powdery O-(m-trifluoromethylphenylcarbamoyl)fumagillol (285 mg) (82% yield). 1 H-NMR (CDCl 3 ) δ: 1.12 (1H, m), 1.23 (3H, s), 1.67 (3H, s), 1.75 (3H, s), 1.99 (1H, d, J=11.2 Hz), 1.8-2.5 (5H, m), 2.59 (2H, m), 3.00 (1H, d, J=4.2 Hz), 3.48 (3H, s), 3.71 (1H, dd, J=11.2 Hz, J=2.7 Hz), 5.21 (1H, m), 5.60 (1H, m), 7.00 (1H, br s), 7.25-7.60 (3H, m), 7.76 (1H, br s). Example 4 O-(1-Naphtylcarbamoyl)fumagillol and O-[N-(1-naphtylcarbamoyl)-N-(1-naphtyl)carbamoyl]fumagillol In the same manner as in Example 1, fumagillol (220 mg) was reacted with 1-naphtyl isocyanate (135 mg) with stirring at room temperature for 15 hours. Purification by silica gel column chromatography (n-hexane·ethyl) acetate = 9:1) gave colorless, powdery O-[N-(1-naphtylcarbamoyl)-N-(1-naphtyl)carbamoyl]fumagillol (215 mg) (44% yield). 1 H-NMR (CDCl 3 ) δ: 0.50 (1H, m), 0.90 (1H, m), 0.97 (3H x 2 / 5), s), 1.07 (3H x 3 / 5, s), 1.30 (1H, m), 1.67 (3H, s), 1.77 (3H, s), 1.45-1.80 (2H, m), 1.9-2.4 (4H, m), 2.56 (1H x 2 / 5), d, J=4.2 Hz), 2.69 (1H x 3 / 5, d, J=4.2 Hz), 3.35-3.55 (1H, m), 3.50 (3H x 2 / 5, s), 3.52 (3H x 2 / 5, s), 5.20 (1H, m), 5.65 (1H, br s), 7.4-8.3 (14H, m), 11.65 (1H, br s). The subsequent elution from the silica gel column with n-hexane-ethyl acetate (4:1) gave colorless, powdery O-(1-naphtylcarbamoyl)fumagillol (161 mg) (46% yield). 1 H-NMR (CDCl 3 ) δ: 1.10 (1H, m), 1.24 (3H, s), 1.67 (3H, s), 1.75 (3H, s), 1.6-2.5 (6H, m), 2.55 (1H, d, J=4.2 Hz), 2.59 (1H, m), 2.99 (1H, d, J=4.2 Hz), 3.47 (3H, s), 3.70 (1H, dd, J=11.2 Hz, J=2.6 Hz), 5.22 (1H, m), 5.63 (1H, br s), 7.19 (1H, br s), 7.4-8.0 (7H, m). Reference Example 2 O-Phenoxycarbonylfumagillol Fumagillol (133 mg) and dimethylaminopyridine (115 mg) were dissolved in dichloromethane (3 ml), followed by addition of phenyl chloroformate (111 mg). The mixture was stirred at room temperature for 30 minutes. After addition of water, the mixture was diluted with dichloromethane (30 ml), washed with water and saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was subjected to silica gel column chromatography (eluent: n-hexane-ethyl acetate = 5:1) to give colorless, oily O-phenoxycarbonylfumagillol (174 mg) (92% yield). 1 H-NMR (CDCl 3 ) δ: 1.10 (1H, m), 1.22 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.8-2.45 (6H, m), 2.56 (1H, d, J=4.4 Hz), 2.59 (1H, t, J=6.4 Hz), 2.99 (1H, d, J=4.4 Hz), 3.50 (3H, s), 3.69 (1H, dd, J=11.2 Hz, J=2.6 Hz), 5.18 (1H, m), 5.58 (1H, br s), 7.15-7.45 (5H, m). Reference Example 3 O-Carbamoylfumagillol O-Phenoxycarbonylfumagillol (402 mg) was dissolved in ethanol (5 ml), followed by addition of concentrated aqueous ammonia (3 ml). The mixture was sitrred at room temperature for 3 hours. The solvent was distilled off under reduced pressure and the residue was subjected to silica gel column chromatography (eluent: n-hexane-ethyl acetate = 1:1) to give colorless, powdery O-carbamoylfumagillol (273 mg) (84% yield). m.p.: 125-126°C 1 H-NMR (CDCl 3 ) δ: 1.07 (1H, m), 1.21 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.6-2.5 (6H, m), 2.55 (1H, d, J=4.4 Hz), 2.57 (1H, t, J=7.4 Hz), 2.98 (1H, d, J=4.4 Hz), 3.45 (3H, s), 3.65 (1H, dd, J=11.4 Hz, J=2.8 Hz), 5.09 (2H, br s), 5.21 (1H, br t, J=7.6 Hz), 5.46 (1H, br s). Example 5 O-Carbazoylfumagillol In the same manner as in Reference Example 3, O-phenoxycarbonylfumagillol (400 mg) was reacted with hydrazine (120 mg) with stirring at room temperature for 1 hour. Purifcation by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 1:2) gave light yellow, powdery O-carbazoylfumagillol (169 mg) (50% yield). 1 H-NMR (CDCl 3 ) δ: 1.07 (1H, m), 1.21 (3H, s), 1.65 (3H, s), 1.74 (3H, s), 1.6-2.5 (6H, m), 2.55 (1H, d, J=4.2 Hz), 2.56 (1H, t, J=6.4 Hz), 2.98 (1H, d, J=4.2 Hz), 3.47 (3H, s), 3.65 (1H, dd, J=11.2 Hz, J=2.8 Hz), 3.70 (2H, br s), 5.20 (1H, m), 5.55 (1H, m), 6.19 (lH, br s). Example 6 O-(1-Imidazolylcarbonyl)fumagillol To a solution of fumagillol (236 mg) in dichloromethane (5 ml) was added 1,1'-carbonyldiimidazole (410 mg) and the mixture was stirred at room temperature for 1 day. The reaction mixture was concentrated under reduced pressure and the residue was subjected to silica gel column chromatography (eluent: n-hexane-ethyl acetate = 3:2) to give colorless, oily O-(1-imidazolylcarbonyl)fumagillol (275 mg) (90% yield). 1 H-NMR (CDCl 3 ) δ: 1.20 (1H, m), 1.23 (3H, s), 1.67 (3H, s), 1.75 (3H, s), 1.91 (1H, d, J=11.2 Hz), 1.8-2.5 (5H, m), 2.62 (1H, t, J=6.4 Hz), 2.62 (1H, d, J=4.2 Hz), 3.04 (1H, d, J=4.2 Hz), 3.52 (3H, s), 3.77 (1H, dd, J=11.2 Hz, J=2.6 Hz), 5.21 (1H, m), 5.83 (1H, br s), 7.06 (1H, d, J=1.4 Hz), 7.41 (1H, t, J=1.4 Hz), 8.12 (1H, s). Example 7 O-(2-dimethylaminoethylcarbamoyl)fumagillol To a solution of O-(1-imidazolylcarbonyl)fumagillol (270 mg) in dichloromethane (3 ml) was added 2-dimethylaminoethylamine (90 mg) and the mixture was stirred at room temperature for 1 day. The reaction mixture was diluted with ethyl acetate, washed with saturated aqueous sodium hydrogen carbonate solution, water and saturated aqueous sodium chloride solution and dried over anhydrous magesium sulfate. The solvent was distilled off under reduced pressure and the residue was subjected to silica gel column chromatography (eluent: chloroform-methanol = 20:1) to give colorless, powdery O-(2-dimethylaminoethylcarbamoyl)fumagillol (139 mg) (53% yield). 1 H-NMR (CDCl 3 ) δ: 1.08 (1H, m), 1.22 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 2.23 (6H, m), 1.6-2.5 (6H, m), 2.41 (2H, t, J=6.0 Hz), 2.55 (1H, d, J=4.4 Hz), 2.58 (1H, t, J=6.6 Hz), 2.98 (1H, d, J=4.4 Hz), 3.23 (2H, m), 3.46 (3H, s), 3.65 (1H, dd, J=11.2 Hz, J=2.8 Hz), 5.21 (1H, m), 5.39 (lH, br t), 5.50 (1H, br s). Example 8 O-Acetylcarbamoylfumagillol In the same manner as in Example 1, fumagillol (700 mg) was reacted with acetyl isocyanate (500 mg) with stirring at room temperature for 10 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 2:1) gave colorless, syrupy O-acetylcarbamoylfumagillol (825 mg) (91% yield). 1 H-NMR (CDCl 3 ) δ: 1.10 (1H, m), 1.21 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.8-2.5 (6H, m), 2.39 (3H, s), 2.57 (1H, t, J=6.8 Hz), 2.58 (1H, d, J=4.2 Hz), 2.99 (1H, d, J=4.2 Hz), 3.47 (3H, s), 3.68 (1H, dd, J=11.4 Hz, J=2.8 Hz), 5.20 (lH, m), 5.57 (lH, br s), 8.03 (1H, br s). Example 9 O-Dichloroacetylcarbamoylfumagillol In the same manner as in Example 1, fumagillol (570 mg) was reacted with dichloroacetyl isocyanate (500 mg) with stirring at room temperature for 10 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 3:1) gave colorless, syrupy O-dichloroacetylcarbamoylfumagillol (789 mg) (90% yield). 1 H-NMR (CDCl 3 ) δ: 1.11 (1H, m), 1.22 (3H, s), 1.67 (3H, s), 1.75 (3H, s), 1.96 (1H, d, J=11.2 Hz), 1.6-2.6 (6H, m), 2.58 (1H, d, J=4.2 Hz), 2.99 (1H, d, J=4.2 Hz), 3.48 (3H, s), 3.71 (1H, dd, J=11.2 Hz, J=2.8 Hz), 5.20 (1H, m), 5.64 (1H, m), 6.38 (1H, s), 8.50 (1H, s). Example 10 O-Benzoylcarbamoylfumagillol In the same manner as in Example 1, fumagillol (510 mg) was reacted with benzoyl isocyanate (530 mg) with stirring at room temperature for 30 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 3:1) gave colorless, powdery O-benzoylcarbamoylfumagillol (450 mg) (58% yield). 1 H-NMR (CDCl 3 ) δ: 1.09 (1H, m), 1.20 (3H, s), 1.65 (3H, s), 1.74 (3H, s), 1.6-2.45 (6H, m), 2.55 (1H, d, J=4.2 Hz), 2.56 (1H, t, J=7.0 Hz), 2.97 (1H, d, J=4.2 Hz), 3.42 (3H, s), 3.68 (1H, dd, J=11.4 Hz, J=2.6 Hz), 5.19 (1H, br t, J=7.4 Hz), 6.65 (1H, br s), 7.4-7.6 (3H, m), 7.89 (2H, dd, J=7.0 Hz, J=1.4 Hz), 8.88 (lH, br s). Example 11 O-Methacryloylcarbamoylfumagillol In the same manner as in Example 1, fumagillol (1 g) was reacted with methacryloyl isocyanate (900 mg) with stirring at room temperature for 10 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 2:1) gave colorless, powdery O-methacryloylcarbamoylfumagillol (511 mg) (37% yield). m.p.: 48°C 1 H-NMR (CDCl 3 ) δ: 1.10 (1H, m), 1.22 (3H, s), 1.66 (3H, s), 1.76 (3H, s), 2.00 (3H, s), 1.6-2.5 (6H, m), 2.57 (1H, d, J=4.4 Hz), 2.60 (1H, t, J=6.0 Hz), 2.99 (1H, d, J=4.4 Hz), 3.47 (3H, s), 3.70 (1H, dd, J=11.4 Hz, J=2.8 Hz), 5.21 (1H, m), 5.58 (1H, d, J=1.6 Hz), 5.64 (1H, d, J=2.6 Hz), 5.79 (1H, s), 7.94 (1H, br s). Example 12 O-(2-Chloroethylcarbamoyl)fumagillol In the same manner as in Example 1, fumagillol (263 mg) was reacted with 2-chloroethyl isocyanate (150 mg) with stirring at room temperature for 1 day. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 3:1) gave colorless, powdery 0-(2-chloroethylcarbamoyl)fumagillol (100 mg) (29% yield). 1 H-NMR (CDCl 3 ) δ: 1.08 (1H, m), 1.21 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.6-2.5 (6H, m), 2.56 (1H, d, J=4.4 Hz), 2.57 (1H, t, J=6.0 Hz), 2.98 (1H, d, J=4.4 Hz), 3.46 (3H, s), 3.4-3.7 (5H, m), 5.20 (2H, m), 5.50 (1H, br s). Example 13 O-(p-Nitrophenylcarbamoyl)fumagillol In the same manner as in Example 1, fumagillol (290 mg) was reacted with p-nitrophenyl isocyanate (500 mg) with stirring at room temperature for 20 hours. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 5:1) gave light yellow, powdery O-(p-nitrophenylcarbamoyl)fumagillol (255 mg) (56% yield). 1 H-NMR (CDCl 3 ) δ: 1.01 (1H, m), 1.29 (3H, s), 1.65 (3H, s), 1.75 (3H, s), 1.8-2.5 (6H, m), 2.58 (1H, t, J=6.2 Hz), 2.61 (1H, d, J=4.2 Hz), 3.01 (1H, d, J=4.2 Hz), 3.39 (3H, s), 3.75 (1H, dd, J=11.2 Hz, J=2.6 Hz), 5.20 (1H, m), 5.64 (1H, br s), 7.62 (2H, d, J=9.2 Hz), 8.15 (2H, d, J=9.2 Hz), 8.29 (1H, s). Example 14 O-(p-Toluenesulfonylcarbamoyl)fumagillol In the same manner as in Example 1, fumagillol (213 mg) was reacted with p-toluenesulfonyl isocyanate (250 mg) with stirring at room temperature for 2 hours. Purification by silica gel column chromatogrpahy (eluent: n-hexane-ethyl acetate = 2:1) gave colorless, powdery O-(p-toluenesulfonylcarbamoyl)fumagillol (247 mg) (68% yield). 1 H-NMR (CDCl 3 ) δ: 1.08 (1H, m), 1.18 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 2.44 (3H, s), 1.6-2.6 (6H, m), 2.55 (1H, d, J=4.2 Hz), 2.57 (1H, t, J=6.3 Hz), 3.26 (3H, s), 3.60 (1H, dd, J=11.2 Hz, J=2.6 Hz), 5.19 (1H, m), 5.42 (1H, br s), 7.34 (2H, d, J=8.0 Hz), 7.94 (2H, d, J=8.0 Hz), 8.60 (1H, br s). Example 15 O-Acetoxyacetylcarbamoylfumagillol To a solution of O-chloroacetylcarbamoylfumagillol (201 mg) in dimethylformamide (3 ml) was added sodium acetate (200 mg) and the mixture was stirred at 60°C for 1 hour. The reaction mixture was diluted with ethyl acetate, washed with water and saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 2:1) to give colorless, powdery O-acetoxyacetylcarbamoylfumagillol (165 mg) (77% yield). 1 H-NMR (CDCl 3 ) δ: 1.10 (1H, m), 1.21 (3H, s), 1.65 (3H, s), 1.74 (3H, s), 1.6-2.5 (6H, m), 2.18 (3H, s), 2.56 (2H, m), 2.99 (1H, d, J=4.0 Hz), 3.45 (3H, s), 3.67 (1H, dd, J=11.0 Hz, J=2.4 Hz), 4.96 (1H, d, J=17.4 Hz), 5.06 (1H, d, J=17.4 Hz), 5.19 (1H, br t, J=7.0 Hz), 5.56 (1H, br s), 8.55 (1H, s). Example 16 O-Acetylthioacetylcarbamoylfumagillol To a solution of O-chloroacetylcarbamoylfumagillol (155 mg) in dimethylformamide (2 ml) was added potassium thioacetate (70 mg) and the mixture was stirred at room temperature for 1 minute. The reaction mixture was diluted with ethyl acetate, washed with water and saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 2:1) to give colorless, powdery O-acetylthioacetylcarbamoylfumagillol (156 mg) (92% yield) 1 H-NMR (CDCl 3 ) δ: 1.10 (1H, m), 1.22 (3H, s), 1.67 (3H, s), 1.76 (3H, s), 1.8-2.5 (6H, m), 2.43 (3H, s), 2.43 (3H, s), 2.59 (1H, d, J=4.2 Hz), 2.60 (1H, t, J=6.7 Hz), 3.00 (1H, d, J=4.2 Hz), 3.48 (3H, s), 3.69 (1H, dd, J=11.2 Hz, J=2.6 Hz), 3.97 (1H, d, J=16.2 Hz), 4.07 (1H, d, J=16.2 Hz), 5.21 (1H, m), 5.63 (1H, m), 8.32 (1H, br s). Example 17 O-(2-Benzothiazolylthioacetylcarbamoyl)fumagillol To a solution of O-chloroacetylcarbamoylfumagillol (160 mg) in dimethylformamide (2 ml) was added 2-mercaptobenzothiazole sodium (95 mg) and the mixture was stirred at room temperature for 1.5 hours. The reaction mixture was diluted with ethyl acetate, washed with water and saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purifed by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 3:1) to give colorless, powdery O-(2-benzothiazolylthioacetylcarbamoyl)fumagillol (152 mg) (72% yield). 1 H-NMR (CDCl 3 ) δ: 1.00 (1H, m), 1.20 (3H, s), 1.68 (3H, s), 1.78 (3H, s), 1.6-2.5 (7H, m), 2.51 (1H, d, J=4.2 Hz), 2.96 (1H, d, J=4.2 Hz), 3.48 (3H, s), 3.66 (1H, dd, J=11.4 Hz, J=2.8 Hz), 4.05 (1H, d, J=14.8 Hz), 4.24 (1H, d, J=14.8 Hz), 5.22 (1H, m), 5.65 (1H, br s), 7.3-7.5 (2H, m), 7.79 (1H, dd, J=7.2 Hz, J=1.4 Hz), 7.88 (1H, dd, J=7.2 Hz, J=1.4 Hz), 10.24 (1H, br s). Example 18 O-[(Pyridine-N-oxide-2-yl)thioacetylcarbamoyl]fumagillol In the same manner as in Example 17, O-chloroacetylcarbamoylfumagillol (144 mg) was reacted with sodium pyridine-N-oxide-2-thiolate (60 mg) with stirring at room temperature for 10 minutes. Purification by silica gel column chromatography (eluent: chloroform-methanol = 20:1) gave colorless, powdery O-[(pyridine-N-oxide-2-yl)thioacetylcarbamoyl]fumagillol (150 mg) (85% yield). 1 H-NMR (CDCl 3 ) δ: 1.07 (1H, m), 1.21 (3H, s), 1.65 (3H, s), 1.74 (3H, s), 1.8-2.4 (6H, m), 2.55 (lH, d, J=4.4 Hz), 2.57 (1H, t, J=6.4 Hz), 2.98 (1H, d, J=4.4 Hz), 3.46 (3H, s), 3.68 (1H, dd, J=11.4 Hz, J=2.6 Hz), 3.94 (1H, d, J=15.4 Hz), 4.13 (1H, d, J=15.4 Hz), 5.19 (1H, m), 5.60 (1H, m), 7.1-7.35 (2H, m), 7.50 (1H, d, J=7.2 Hz), 8.33 (1H, d, J=6.2 Hz), 9.29 (1H, br s). Example 19 O-Diethylaminoacetylcarbamoylfumagillol To a solution of O-chloroacetylcarbamoylfumagillol (154 mg) and triethylamine (35 mg) in toluene (2 ml) was added diethylamine (70 mg) and the mixture was stirred at room temperature for 1 day. The reaction mixture was diluted with ethyl acetate, washed with water and saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 2:1) to give colorless, syrupy O-diethylaminoacetylcarbamoylfumagillol (85 mg) (51% yeild). 1 H-NMR (CDCl 3 ) δ: 1.06 (6H, t, J=7.2 Hz), 1.10 (1H, m), 1.22 (3H, s), 1.66 (3H, s), 1.74 (3H, s), 1.5-2.7 (12H, m), 2.99 (2H, d, J=4.2 Hz), 3.15 (2H, t, J=7.5 Hz), 3.48 (3H, s), 3.68 (1H, dd, J=11.2 Hz, J=4.6 Hz), 5.20 (1H, m), 5.67 (1H, m), 55 (1H, br s). Example 20 O-Chloroacetylcarbamoyldihydrofumagillol O-Chloroacetylcarbamoyldihydrofumagillol (173 mg) (81% yield) was derived from dihydrofumagillol (150 mg) in the same manner as in Example 1. 1 H-NMR (CDCl 3 ) δ: 0.91 (6H, d, J=6.6 Hz), 1.13 (1H, m), 1.18 (3H, s), 1.2-2.2 (9H, m), 2.57 (1H, dd, J=7.2 Hz, J=4.6 Hz), 2.63 (1H, d, J=4.2 Hz), 2.91 (1H, d, J=4.2 Hz), 3.47 (3H, s) 3.69 (1H, dd, J=11.4 Hz, J=2.6 Hz), 4.44 (2H, s), 5.62 (lH, br s), 8.36 (1H, br s). Example 21 O-[[1-(2-Dimethylaminoethyl)tetrazol]-5-yl-thioacetylcarbamoyl]fumagillol In the same manner as in Example 17, O-chloroacetylcarbamoylfumagillol (195 mg) was reacted with 1-(2-dimethylaminoethyl)-5-mercaptotetrazole sodium (113 mg) with stirring at room temperature for 1 hour. Purification by silica gel column chromatography (eluent: ethyl acetate) gave colorless, powdery O-[[1-(2-dimethylaminoethyl)tetrazol]-5-yl-thioacetylcarbamoyl]fumagillol (217 mg) (83% yield). 1 H-NMR (CDCl 3 ) δ: 1.10 (1H, m), 1.20 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.8-2.45 (6H, m), 2.59 (2H, m), 2.77 (2H, t, J=6.2 Hz), 2.99 (1H, d, J=4.2 Hz, 3.47 (3H, s), 3.67 (1H, dd, J=11.4 Hz, J=2.6 Hz), 4.37 (4H, m), 5.20 (1H, m), 5.62 (1H, m), 8.99 (1H, br s). Example 22 O-[(2-methyl-1,3,4-thiadiazol-5-yl)thioacethylcarbamoyl]fumagillol In the same manner as in Example 17, O-chloroacetylcarbamoylfumagillol (283 mg) was reacted with sodium 2-methyl-1,3,4-thiadiazole-5-thiolate (130 mg) with stirring at room temperature for 30 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 1:1) gave colorless, powdery O-[(2-methyl-1,3,4-thiadiazol-5-yl)thioacethylcarbamoyl]fumagillol (293 mg) (84% yield). 1 H-NMR (CDCl 3 ) δ: 1.09 (1H, m), 1.20 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.6-2.4 (6H, m), 2.57 (2H, m), 2.73 (3H, s), 2.98 (1H, d, J=4.2 Hz), 3.45 (3H, s), 3.67 (1H, dd, J=11.2 Hz, J=2.6 Hz), 4.32 (1H, d, J=16.2 Hz), 4.44 (1H, d, J=16.2 Hz), 5.21 (1H, m), 5.61 (1H, br s), 9.43 (1H, br s). Example 23 O-(1-Naphthalenethioacetylcarbamoyl)fumagillol In the same manner as in Example 17, O-chloroacetylcarbamoylfumagillol (159 mg) was reacted with sodium naphthalenethiolate (188 mg) with stirring at room temperature for 5 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 3:1) gave colorless, powdery O-(1-naphthalenethioacetylcarbamoyl)fumagillol (160 mg) (81% yield). 1 H-NMR (CDCl 3 ) δ: 1.08 (1H, m), 1.20 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.89 (1H, d, J=11.2 Hz), 1.6-2.45 (5H, m), 2.54 (2H, m), 2.73 (3H, s), 2.98 (1H, d, J=4.2 Hz), 3.45 (3H, s), 3.66 (1H, dd, J=11.2 Hz, J=2.6 Hz), 3.96 (1H, d, J=15.4 Hz), 4.07 (1H, d, J=15.4 Hz), 5.20 (1H, m), 5.57 (1H, m), 7.35-7.9 (6H, m), 8.11 (1H, br s), 8.40 (1H, d, J=7.8 Hz). Example 24 O-[(N-Methylpyrrolidin-1-ylium)acetylcarbamoyl]fumagillol chloride O-Chloroacetylcarbamoylfumagillol (170 mg) and N-methylpyrrolidine (1 ml) were stirred in ether (3 ml) at room temperature for 1 week. The resultant precipitate was recovered by filtration, washed with ether and dried in vacuo. The procedure gave colorless, powdery O-[(N-methylpyrrolidin-1-ylium)acetylcarbamoyl]fumagillol chloride (170 mg) (82% yield). 1 H-NMR (CDCl 3 ) δ: 0.97 (1H, m), 1.16 (3H, s), 1.63 (3H, s), 1.73 (3H, s), 1.4-2.7 (1H, m), 2.53 (1H, d, J=4.2 Hz), 2.66 (1H, t, J=6.2 Hz), 2.94 (1H, d, J=4.2 Hz), 3.41 (3H, s), 3.42 (2H, s), 3.64 (1H, dd, J=11.4 Hz, J=2.6 Hz), 3.8-4.1 (4H, m), 4.70 (1H, d, J=16.8 Hz), 5.14 (1H, m), 5.40 (1H, d, J=16.8 Hz), 5.60. Example 25 O-[2-(N,N,N-Trimethylammonio)ethylcarbamoyl)fumagillol iodide O-(2-Dimethylaminoethylcarbamoyl)fumagillol (81 mg) and methyl iodide (0.5 ml) were stirred in dichloromethane (1 ml) at room temperature for 15 hours. The solvent was distilled off under reduced pressure and the residue was washed with ether to give colorless, powdery O-[2-(N,N,N-trimethylammonio)ethylcarbamoyl]fumagillol iodide (105 mg) (95% yield). m.p.: 94-95°C 1 H-NMR (CDCl 3 ) δ: 1.03 (1H, m), 1,17 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.5-2.4 (6H, m), 2.57 (1H, d, J=4.2 Hz), 2.68 (1H, t, J=6.6 Hz), 2.97 (1H, d, J=4.2 Hz), 3.44 (12H, s), 3.3-3.9 (5H, m), 5.18(1H, m), 5.50 (1H, m) 6.80 (1H, m). Example 26 O-[N-Acetyl-(2-dimethylaminoethylcarbamoyl)]fumagillol To a solution of O-(2-dimethylaminoethylcarbamoyl)fumagillol (145 mg) and triethylamine (0.5 ml) in dichloromethane (2 ml) was added acetic anhydride (0.3 ml) and the mixture was stirred at room temperature for 1 day. The reaction mixture was diluted with ethyl acetate, washed with water and saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography (eluent: dichloromethane-methanol = 20:1) to give colorless, oily O-[N-acetyl-(2-dimethylaminoethylcarbamoyl]fumagillol (113 mg) (73% yield). 1 H-NMR (CDCl 3 ) δ: 1.15 (1H, m), 1.20 (3H, s), 1.65 (3H, s), 1.74 (3H, s), 1.95 (3H, s), 1.9-2.6 (7H, m), 2.50 (3H, s), 2.53 (3H, s), 2.60 (1H, d, J=4.4 Hz), 2.78 (1H, t, J=6.4 Hz), 2.86 (1H, m), 3.02 (lH, t, J=6.4 Hz), 3.45 (3H, s), 3.69 (1H, dd, J=11.4 Hz, J=2.8 Hz), 4.03 (2H, m), 5.20 (1H, m), 5.71 (1H, m). Example 27 O-Acryloylcarbamoylfumagillol In the same manner as in Example 1, fumagillol (220 mg) was reacted with acryloyl isocyanate (200 mg) with stirring at room temperature for 30 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 3:1) gave colorless, powdery O-acryloylcarbamoylfumagillol (60 mg) (21% yield). 1 H-NMR (CDCl 3 ) δ: 1.10 (1H, m), 1.21 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.6-2.5 (6H, m), 2.58 (1H, d, J=4.2 Hz), 2.59 (1H, m), 2.99 (1H, d, J=4.2 Hz), 3.47 (3H, s), 3.69 (1H, dd, J=11.2 Hz, J=2.6 Hz), 5.21 (1H, m), 5.60 (1H, m), 5.88 (1H, dd, J=10.4 Hz, J=1.6 Hz), 6.51 (1H, dd, J=17.0 Hz, J=1.6 Hz), 6.92 (1H, dd, J=17.0 Hz, J=1.6 Hz), 6.92 (1H, dd, J=17.0 Hz, J=10.4 Hz), 7.78 (1H, br s). Example 28 O-[(1-Methyl-2-methoxycarbonyl-1,3,4-triazol-5-yl)thioacetylcarbamoyl]fumagillol In the same manner as in Example 17, O-chloroacetylcarbamoylfumagillol (270 mg) was reacted with sodium l-methyl-2-methoxycarbonyl-1,3,4-triazole-5-thiolate (164 mg) with stirring at room temperature for 30 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 1:4) gave colorless, powdery O-[(1-methyl-2-methoxycarbonyl-1,3,4-triazol-5-yl)thioacetylcarbamoyl]fumagillol (288 mg) (80% yield). 1 H-NMR (CDCl 3 ) δ: 1.07 (1H, m) 1.18 (3H, s), 1.65 (3H, s), 1.75 (3H, s), 1.6-2.4 (6H, m), 2.54 (2H, m), 2.96 (1H, d, J=4.2 Hz), 3.44 (3H, s), 3.64 (1H, dd, J=11.4 Hz, J=2.4 Hz), 3.91 (3H, s), 3.99 (3H, s) 4.30 (1H, d, J=15.8 Hz), 4.41 (1H, d, J=15.8 Hz), 5.19 (1H, m), 5.59 (1H, m), 9.96 (1H, br s). Example 29 O-[(2-Benzoxazolyl)thioacetylcarbamoyl)fumagillol In the same manner as in Example 17, O-chloroacetylcarbamoylfumagillol (230 mg) was reacted with 2-mercaptobenzoxazole sodium salt (119 mg) with stirring at room temperature for 30 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 3:1) gave colorless, powdery O-[(2-benzoxazolyl)thioacetylcarbamoyl]fumagillol (269 mg) (91% yield). 1 H-NMR (CDCl 3 ) δ: 1.04 (1H, m), 1.20 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.8-2.6 (8H, m), 2.97 (1H, d, J=4.4 Hz), 3.47 (3H, s), 3.67 (1H, dd, J=11.2 Hz, J=2.6 Hz), 4.31 (2H, s), 5.20 (1H, m), 5.63 (1H, m), 7.2-7.3 (2H, m), 7.47 (1H, m), 7.58 (1H, m), 9.49 (1H, br s). Example 30 O-[(2-Benzoimidazolyl)thioacetylcarbamoyl]fumagillol In the same manner as in Example 17 , O-chloroacetylcarbamoylfumagillol (257 mg) was reacted with 2-mercaptobenzoimidazole sodium salt (132 mg) with stirring at room temperature for 30 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 1:1) gave colorless, powdery O-[(2-benzoimidazolyl)thioacetylcarbamoyl]fumagillol (297 mg) (90% yield). 1 H-NMR (CDCl 3 ) δ: 1.03 (1H, m), 1.19 (3H, s), 1.71 (3H, s), 1.83 (3H, s), 1.6-2.4 (7H, m), 2.57 (1H, d, J=4.4 Hz), 2.96 (1H, d, J=4.4 Hz), 3.46 (3H, s), 3.68 (1H, dd, J=11.6 Hz, J=2.2 Hz), 3.74 (1H, d, J=14.2 Hz), 3.87 (1H, d, J=14.2 Hz), 5.25 (1H, m), 5.69 (1H, m), 7.10 (2H, m), 7.3-7.5 (2H, m), 11.01 (1H, br s), 12.60 (1H, br s). Example 31 O-[(8-Quinolyl)thioacetylcarbamoyl]fumagillol In the same manner as in Example 17, O-chloroacetylcarbamoylfumagillol (289 mg) was reacted with 8-mercaptoquinoline sodium salt (208 mg) with stirring at room temperature for 30 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 7:3) gave colorless, powdery O-[(8-quinolyl)thioacetylcarbamoyl]fumagillol (382 mg) (99% yield). 1 H-NMR (CDCl 3 ) δ: 1.07 (1H, m), 1.25 (3H, s), 1.65 (3H, s), 1.75 (3H, s), 1.6-2.55 (8H, m), 2.95 (1H, d, J=4.2 Hz), 3.51 (3H, s), 3.74 (1H, dd, J=11.4 Hz, J=2.8 Hz), 3.77 (1H, d, J=15.4 Hz), 3.92 (1H, d, J=15.4 Hz), 5.19 (1H, m), 5.67 (1H, m), 7.50 (1H, t, J=7.8 Hz), 7.60 (1H, dd, J=8.4 Hz, J=4.4 Hz), 7.82 (1H, d, J= 7.8 Hz), 7.91 (1H, d, J=7.2 Hz), 8.26 (1H, dd, J=8.4 Hz, J=1.6 Hz), 9.20 (1H, dd, J=4.4 Hz, J=1.6 Hz), 11.84 (1H, br s). Example 32 O-[(2-Pyridyl)thioacetylcarbamoyl]fumagillol In the same manner as in Example 17, O-chloroacetylcarbamoylfumagillol (292 mg) was reacted with 2-pyridinethiol sodium salt (116 mg) with stirring at room temperature for 30 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 2:1) gave colorless, powdery O-[(2-pyridyl)thioacetylcarbamoyl]fumagillol (325 mg) (94% yield). 1 H-NMR (CDCl 3 ) δ: 1.08 (1H, m), 1.21 (3H, s), 1.67 (3H, s), 1.76 (3H, s), 1.6-2.6 (8H, m), 2.98 (1H, d, J=4.2 Hz), 3.47 (3H, s), 3.66 (1H, dd, J=11.2 Hz, J=2.6 Hz), 3.77 (1H, d, J=14.8 Hz), 3.93 (1H, d, J=14.8 Hz), 5.23 (1H, m), 5.60 (1H, m), 7.11 (1H, m), 7.31 (1H, d, J=8.8 Hz), 7.59 (1H, m), 8.45 (1H, d, J=5.0 Hz) 10.67 (1H, br s). Example 33 O-[(4-Pyridyl)thioacetylcarbamoyl]fumagillol In the same manner as in Example 17, O-chloroacetylcarbamoylfumagillol (290 mg) was reacted with 4-pyridinethiol sodium salt (115 mg) with stirring at room temperature for 30 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 1:2) gave colorless, powdery O-[(4-pyridyl)thioacetylcarbamoyl]fumagillol (314 mg) (91% yield). 1 H-NMR (CDCl 3 ) δ: 1.10 (1H, m), 1.21 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.6-2.6 (6H, m), 2.54 (1H, t, J=6.2 Hz), 2.57 (1H, d, J=4.4 Hz), 2.98 (1H, d, J=4.4 Hz), 3.48 (3H, s), 3.69 (lH, dd, J=11.2 Hz, J=2.4 Hz), 4.13 (1H, d, J=15.8 Hz), 4.22 (1H, d, J=15.8 Hz), 5.20 (1H, m), 5.61 (1H, m), 7.22 (2H, dd, J=5.0 Hz, J=1.4 Hz), 8.43 (2H, d, J=6.0 Hz), 8.82 (1H, br s). Example 34 O-(Methylthioacetylcarbamoyl)fumagillol In the same manner as in Example 17, O-chloroacetylcarbamoylfumagillol (107 mg) was reacted with methanethiol sodium salt (225 mg) with stirring at 10°C for 1 hour. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 3:1) gave colorless, powdery O-(methylthioacetylcarbamoyl)fumagillol (500 mg) (45% yield). 1 H-NMR (CDCl 3 ) δ: 1.10 (1H, m), 1.21 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.75 (3H, s), 1.93 (1H, d, J=11.2 Hz), 2.18 (3H, s), 1.7-2.45 (5H, m), 2.58 (2H, m), 2.99 (1H, d, J=4.2 Hz), 3.47 (3H, s), 3.48 (1H, d, J=16.8 Hz), 3.55 (1H, d, J=16.8 Hz), 3.68 (1H, dd, J=11.2 Hz, J=2.8 Hz), 5.20 (1H, m), 5.61 (1H, m), 8.12 (1H, br s). Example 35 O-[(4-Hydroxypyrimidin-2-yl)thioacetylcarbamoyl]fumagillol In the same manner as in Example 17, O-chloroacetylcarbamoylfumagillol (239 mg) was reacted with thiouracil sodium salt (123 mg) with stirring at room temperature for 30 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 1:5) gave colorless, powdery O-[(4-hydroxypyrimidin-2-yl)thioacetylcarbamoyl]fumagillol (208 mg) (71% yield). 1 H-NMR (CDCl 3 ) δ: 1.09 (1H, m), 1.22 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.5-2.6 (7H, m), 2.58 (1H, d, J=4.2 Hz), 2.99 (1H, d, J=4.2 Hz), 3.47 (3H, s), 3.68 (1H, dd, J=11.2 Hz, J=2.4 Hz), 4.08 (1H, d, J=15.8 Hz), 4.20 (1H, d, J=15.8 Hz), 5.21 (1H, m), 5.61 (1H, m), 6.27 (1H, d, J=6.6 Hz), 7.88 (1H, d, J=6.6 Hz), 9.07 (1H, br s). Example 36 O-[(1,2,3-Triazol-5-yl)thioacetylcarbamoyl]fumagillol In the same manner as in Example 17, O-chloroacetylcarbamoylfumagillol (249 mg) was reacted with 5-mercapto-1,2,3-triazole sodium salt (118 mg) with stirring at room temperature for 1 hour. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 3:2) gave colorless, powdery O-[(1,2,3-triazol-5-yl)thioacetylcarbamoyl]fumagillol (206 mg) (71% yield). 1 H-NMR (CDCl 3 ) δ: 1.07 (1H, m), 1.27 (3H, s), 1.67 (3H, s), 1.76 (3H, s), 1.7-2.6 (6H, m), 2.59 (1H, d, J=4.2 Hz), 2.79 (1H, t, J=6.2 Hz), 2.99 (1H, d, J=4.2 Hz), 3.41 (3H, s), 3.69 (1H, dd, J=11.2 Hz, J=2.6 Hz), 3.3-3.9 (2H, m), 5.20 (1H, m), 5.59 (1H, m), 7.71 (1H, s), 8.90 (1H, br s). Example 37 O-[(Dimethylsulfonio)acetylcarbamoyl]fumagillol iodide O-(Methylthioacetylcarbamoyl)fumagillol (167 mg) and methyl iodide (1 ml) were stirred in acetonitrile (1 ml) at room temperature overnight. The solvent was distilled off under reduced pressure and ether was added to the residue. The resulting precipitate was collected by filtration, washed with ether and dried under reduced pressure to give colorless, powdery O-[(dimethylsulfonio)acetylcarbamoyl]fumagillol iodide (79 mg) (35% yield). 1 H-NMR (d 6 -DMSO) δ: 1.09 (3H, s), 1.32 (1H, m), 1.62 (3H, s), 1.72 (3H, s), 1.6-2.95 (10H, m), 2.92 (6H, s), 3.34 (3H, s), 3.66 (1H, m), 4.90 (2H, s), 5.21 (1H, m), 5.49 (1H, m). Example 38 O-[(N-Methylpyridin-4-ylium)thioacetylcarbamoyl]fumagillol iodide O-[(4-Pyridyl)thioacetylcarbamoyl]fumagillol (113 mg) and methyl iodide (1 ml) were dissolved in dichloromethane (2 ml) and the solution was stirred at room temperature overnight. The solvent was distilled off under reduced pressure and ether was added to the residue. The resulting precipitate was collected by filtration and washed with ether to give colorless, powdery O-[(N-methylpyridin-4-ylium)thioacetylcarbamoyl]fumagillol iodide (127 mg) (87% yield). 1 H-NMR (CDCl 3 ) δ: 1.05 (1H, m), 1.21 (3H, s), 1.65 (3H, s), 1.74 (3H, s), 1.5-2.65 (7H, m), 2.92 (lH, t, J=6.2 Hz), 2.98 (1H, d, J=4.0 Hz), 3.49 (3H, s), 3.71 (1H, dd, J=11.2 Hz, J=2.4 Hz), 4.32 (2H, m), 4.37 (3H, s), 5.19 (1H, m), 5.64 (1H, m), 7.90 (2H, d, J=6.8 Hz), 3.76 (2H, d, J=6.8 Hz), 10 12 (1H, br s). Example 39 O-[N-(Ethoxycarbonyl)carbamoyl]fumagillol In the same manner as in Example 1, fumagillol (350 mg) was reacted with ethoxycarbonyl isocyanate (200 mg) with stirring at room temperature for 30 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 3:1) gave colorless, powdery O-[N-(ethoxycarbonyl)carbamoyl]fumagillol (370 mg) (75% yield). 1 H-NMR (CDCl 3 ) δ: 1.08 (1H, m), 1.21 (3H, s), 1.30 (3H, t, J=7.0 Hz), 1.66 (3H, s), 1.75 (3H, s), 1.8-2.45 (6H, m), 2.56 (1H, d, J=4.2 Hz), 2.57 (1H, m), 2.98 (1H, d, J=4.2 Hz), 3.46 (3H, s), 3.67 (1H, dd, J=11.4 Hz, J=2.8 Hz), 4.23 (2H, q, J=7.0 Hz), 5.21 (1H, m), 5.62 (1H, m), 7.21 (1H, br s). Example 40 O-[N-(3-Furoyl)carbamoyl]fumagillol 3-Furancarboxamide (167 mg) was suspended in dichloromethane (10 ml), followed by addition of oxalyl chloride (0.20 ml) under ice-cooling, and the temperature of the reaction mixture was raised to room temperature. The reaction mixture was refluxed for 10 hours and the solvent was distilled off to give crude 3-furoyl isocyanate. In the same manner as in Example 8, the above product was reacted with fumagillol (213 mg) with stirring at room temperature for 30 minutes. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 2:1) gave colorless, powdery O-[N-(3-furoyl)carbamoyl]fumagillol (120 mg) (38% yield). 1 H-NMR (CDCl 3 ) δ: 1.11 (1H, m), 1.22 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.8-2.5 (5H, m), 2.00 (1H, d, J=11.2 Hz), 2.57 (1H, d, J=4.0 Hz), 2.61 (1H, t, J=6.6 Hz), 2.99 (1H, d, J-4.0 Hz), 3.44 (4H, m), 3.70 (1H, dd, J=11.2 Hz, J-=2.8 Hz), 5.20 (1H, m), 5.63 (1H, m), 6.80 (1H, m), 7.47 (1H, m), 8.16 (1H, m), 8.26 (1h br s). Example 41 O-[N-(Phenoxycarbonyl)carbamoyl]fumagillol In the same manner as in Example 1, fumagillol (200 mg) was reacted with phenoxycarbonyl isocyanate (231 mg) with stirring at room temperature for 4 hours. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 2:1) gave colorless, powdery O-[N-(phenoxycarbonyl)carbamoyl]fumagillol (125 mg) (39% yield). 1 H-NMR (CDCl 3 ) δ: 1.09 (1H, m), 1.21 (3H, s), 1.65 (3H, s), 1.74 (3H, s), 1.5-2.5 (6H, m), 2.55 (1H, d, J=4.1 Hz), (2.57 (1H, t, J=6.5 Hz), 2.98 (1H, d, J=4.1 Hz), 3.50 (3H, s), 3.69 (1H, dd, J=1.4 Hz, J=11.2 Hz), 5.20 (1H, m), 5.70 (1H, m), 7.1-7.4 (5H, m), 7.66 (1H, br s). Example 42 O-(N'-Chloroacetylallophanoyl)fumagillol O-Carbamoylfumagillol (200 mg) was dissolved in dichloromethane (4 ml) followed by addition of chloroacetyl isocyanate (0.10 ml) and the mixture was stirred for 4 hours. The reaction mixture was diluted with ethyl acetate (50 ml), washed with saturated aqueous sodium hydrogen carbonate solution and saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 1:1) to give colorless, powdery O-(N'-chloroacetylallophanoyl)fumagillol (230 mg) (84% yield). 1 H-NMR (CDCl 3 ) δ: 1.12 (1H, m), 1.21 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.8-2.5 (6H, m), 1.92 (1H, d, J=11.2 Hz), 2.57 (1H, d, J=4.2 Hz), 2.59 (1H, t, J=6.8 Hz), 2.99 (1H, d, J=4.2 Hz), 3.48 (3H, s), 3.68 (1H, dd, J-11.4 Hz, J=2.8 Hz), 4.39 (2H, s), 5.20 (1H, m), 5.65 (1H, m). Example 43 O-(N'-Benzoylallophanoyl)fumagillol In the same manner as in Example 42, O-carbamoylfumagillol (200 mg) was reacted with benzoyl isocyanate (0.51 ml) with stirring at room temperature for 2 days. Purification by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 3:2) gave colorless, powdery O-(N'-benzoylallophanoyl)fumagillol (100 mg) (34% yield). 1 H-NMR (CDCl 3 ) δ: 1.12 (1H, m), 1.22 (1H, m), 1.23 (3H, s), 1.66 (3H, s), 1.75 (3H, s), 1.97 (1H, d, J=11.0 Hz), 1.8-2.5 (5H, m), 2.58 (1H, d, J=4.2 Hz), 2.62 (1H, t, J=6.8 Hz), 3.00 (1H, d, J=4.2 Hz), 3.50 (3H, s), 3.69 (1H, dd, J=11.0 Hz, J=2.6 Hz), 5.20 (1H, m), 5.72 (1H, br s), 7.5-7.7 (3H, m), 7.91 (2H, m) Example 44 O-Chloroacetylcarbamoyl-6'b-hydroxyfumagillol Selenium dioxide (295 mg) was added to a 95% solution of O-chloroacetylcarbamoylfumagillol (711 mg) in ethanol (30 ml) and the mixture was refluxed for 5 hours. The solvent was distilled off under reduced pressure. The residue was dissolved in ethyl acetate, washed with saturated aqueous sodium hydrogen carbonate solution and saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography to give colorless, powdery O-chloroacetylcarbamoyl-6'b-hydroxyfumagillol (190 mg) (26% yield). 1 H-NMR (CDCl 3 ) δ: 1.13 (1H, m), 1.22 (3H, s), 1.70 (3H, s), 1.6-2.5 (5H, m), 1.93 (1H, d, J=11.2 Hz), 2.60 (2H, d, J=4.2 Hz), 2.63 (1H, t, J=6.3 Hz), 2.94 (1H, d, J=4.2 Hz), 3.47 (3H, s), 3.69 (1H, dd, J=11.2 Hz, J=2.8 Hz), 4.05 (2H, d, J=5.8 Hz), 5.53 (1H, m), 5.61 (1H, m), 8.18 (1H, brs). Example 45 O-Chloroacetylcarbamoyl-6'b-dimethylaminofumagillol (a) O-Acetyl-6'b-hydroxyfumagillol In the same manner as in Example 44, O-acetylfumagillol (1.00 g) was oxidized with selenium dioxide (0.68 g) and the oxidation product was purified by silica gel column chromatography (eluent: n-hexane-ethyl acetate = 1:2) to give colorless, oily O-acetyl-6'b-hydroxyfumagillol (300 mg) (29% yield). 1 H-NMR (CDCl 3 ) δ: 1.12 (1H, m), 1.23 (3H, s), 1.71 (3H, s), 1.8-2.4 (5H, m), 1.95 (1H, d, J=11.2 Hz), 2.10 (3H, s), 2.57 (1H, d, J=4.2 Hz), 2.64 (1H, t, J=6.4 Hz), 2.93 (1H, d, J=4.2 Hz), 3.43 (3H, s), 3.64 (1H, dd, J=11.2 Hz, J=2.8 Hz), 4.05 (2H, brs), 5.54 (1H, m), 5.64 (1H, m). (b) O-Acetyl-6'b-dimethylaminofumagillol O-Acetyl-6'b-hydroxyfumagillol (469 mg) was dissolved in dichloromethane (5 ml) and, under ice-cooling, triethylamine (0.13 ml) and methanesulfonyl chloride (0.38 ml) were added to the solution. The mixture was stirred for 15 minutes. The reaction mixture was diluted with ethyl acetate (50 ml), washed with saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was dissolved in dimethylformamide (5 ml). Under ice-cooling, anhydrous potassium carbonate (0.95 g) and dimethylamine hydrochloride (1.12 g) were added thereto. The temperature of the mixture was raised to room temperature and the mixture was stirred for 1 hour. The reaction mixture was diluted with ether (50 ml), washed with saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reudced pressure and the residue was purified by silica gel column chromatography (eluent: chloroform-methanol-aqueous ammonia = 20:1:0.1) to give colorless, oily O-acetyl-6'b-dimethylaminofumagillol (118 mg) (23% yield). 1 H-NMR (CDCl 3 ) δ: 1.08 (1H, m), 1.22 (3H, s), 1.71 (3H, s), 1.6-2.6 (5H, m), 1.96 (1H, d, J=11.2-Hz), 2.10 (3H, s), 2.18 (6H, s), 2.55 (1H, d, J=4.4 Hz), 2.62 (1H, t, J=6.4 Hz), 2.81 (2H, br s), 2.95 (1H, d, J=4.4 Hz), 3.44 (3H, s), 3.65 (1H, dd, J=11.2 Hz, J-2.8 Hz), 5.41 (1H, m), 5.65 (1H, m). (c) 6'b-Dimethylaminofumagillol O-Acetyl-6'b-dimethylaminofumagillol (118 mg) was dissolved in methanol (2 ml), and 1 N aqueous sodium hydroxide solution (1 ml) was added to the solution. The mixture was stirred for 15 minutes. The reaction mixture was diluted with ethyl acetate (50 ml), washed with saturated aqueous sodium chloride solution and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure and the residue was purified by silica gel column chromatography (eluent: chloroform-methanol-aqueous ammonia = 20:1:0.1) to give colorless, oily 6'b-dimethylaminofumagillol (102 mg) (97% yield). 1 H-NMR (CDCl 3 ) δ: 0.99 (1H, m), 1.23 (3H, s), 1.70 (3H, s), 1.6-2.5 (5H, m), 1.94 (1H, d, J=11.2 Hz), 2.17 (6H, s), 2.54 (1H, d, J=4.4 Hz), 2.62 (1H, t, J=6.4 Hz), 2.80 (2H, br s), 2.90 (1H, d, J=4.4 Hz), 3.50 (3H, s), 3.63 (1H, dd, J=11.2 Hz, J=2.8 Hz), 5.38 (1H, m), 5.40 (1H, m). (d) O-Chloroacetylcarbamoyl-6'b-dimethylaminofumagillol In the same manner as in Example 1, 6'b-dimethylaminofumagillol (152 mg) was reacted with chloroacetyl isocyanate (67 mg) with stirring at room temperature for 1 hour. Purification by silica gel column chromatography (eluent: chloroform-methanol-aqueous ammonia = 20:1:0.1) gave colorless, powdery O-chloroacetylcarbamoyl-6'b-dimetylaminofumagillol (96 mg) (46% yield). 1 H-NMR (CDCl 3 ) δ: 1.12 (1H, m), 1.22 (3H, s), 1.70 (3H, s), 1.6-2.6 (6H, m), 2.58 (1H, d, J=4.2 Hz), 2.61 (1H, t, J=6.5 Hz), 2.18 (6H, s), 2.81 (2H, br s), 2.95 (1H, d, J=4.2 Hz), 3.47 (3H, s), 3.70 (1H, dd, J=11.2 Hz, J=2.8 Hz), 4.14 (2H, s), 5.40 (1H, m), 5.62 (1H, m).

Claims: Claims for the following Contracting States : AT, BE, CH, DE, FR, GB, GR, IT, LI, LU, NL, SE A compound of the formula wherein R 1 is a 2-methyl-1-propenyl or isobutyl group which may be substituted with hydroxy or di-C 1-3 alkylamino, and R 2 is a carbamoyl group substituted with one or two groups selected from C 1-6 alkanoyl which may be unsaturated, monochloroacetyl, dichloroacetyl, C 1-6 alkoxycarbonylmethyl, carboxymethyl, amino, phenyl substituted with one to five groups selected from C 1-6 alkoxy, haloalkyl and nitro , naphthyl, benzoyl, imidazolyl (together with the carbamoyl nitrogen atom), halogenated C 1-6 alkyl, di-C 1-6 alkylamino-C 1-6 alkyl, C 1-6 alkanoyloxy-C 1-6 alkanoyl, C 1-6 alkanoylthio-C 1-6 alkanoyl, C 1-6 alkylthio-C 1-6 alkanoyl, arylthioC 1-6 alkanoyl, aromatic heterocyclicthio-C 1-6 alkanoyl, N-oxy-2-pyridylthio-C 1-6 alkanoyl, N-C 1-6 alkyl-4-pyridiniothio-C 1-6 alkanoyl halide, di-C 1-6 alkylamino-C 1-6 alkanoyl, ammonio-C 1-6 alkanoyl halide, aromatic heterocyclic carbonyl, C 1-6 alkoxycarbonyl, phenoxycarbonyl, chloroacetylcarbamoyl, benzoylcarbamoyl, phenylsulfonyl (unsubstituted or substituted with one to five C 1-6 alkyl groups) and di(C 1-6 alkyl) sulfonio-C 1-6 alkanoyl halide; or a salt thereof. The compound according to claim 1, wherein R 1 is 2-methyl-1-propenyl which may be substituted by hydroxy or di-C 1-3 alkylamino. The compound according to claim 1, wherein R 1 is 2-methyl-1-propenyl which may be substituted by hydroxy and R 2 is carbamoyl which is substituted by monochloroacetyl or dichloroacetyl. The compound according to claim 1, which is selected from O-monochloroacetylcarbamoylfumagillol, O-dichloroacetylcarbamoylfumagillol, O-monochloroacetylcarbamoyldihydrofumagillol and O-monochloroacetylcarbamoyl-6'b-hydroxyfumagillol. A method of producing the compound according to claim 1, which comprises carbamoylating the compound of the formula wherein R 1 is as defined in claim 1. Claims for the following Contracting State : ES A method of producing a compound of the formula wherein R 1 is a 2-methyl-1-propenyl or isobutyl group which may be substituted with hydroxy or di-C 1-3 alkylamino, and R 2 is a carbamoyl group substituted with one or two groups selected from C 1-6 alkanoyl, which may be unsaturated, monochloroacetyl, dichloroacetyl, C 1-6 alkoxycarbonylmethyl, carboxymethyl, amino, phenyl substituted with one to five groups selected from C 1-6 alkoxy, haloalkyl and nitro , naphthyl, benzoyl, imidazolyl (together with the carbamoyl nitrogen atom), halogenated C 1-6 alkyl, di-C 1-6 alkylamino-C 1-6 alkyl, C 1-6 alkanoyloxy-C 1-6 alkanoyl, C 1-6 alkanoylthio-C 1-6 alkanoyl, C 1-6 alkylthio-C 1-6 alkanoyl, arylthio-C 1-6 alkanoyl, aromatic heterocyclicthio-C 1-6 alkanoyl, N-oxy-2-pyridylthio-C 1-6 alkanoyl, N-C 1-6 alkyl-4-pyridiniothio-C 1-6 alkanoyl halide, di-C 1-6 alkylamino-C 1-6 alkanoyl, ammonio-C 1-6 alkanoyl halide, aromatic heterocyclic carbonyl, C 1-6 alkoxycarbonyl, phenoxycarbonyl, chloroacetylcarbamoyl, benzoylcarbamoyl, phenylsulfonyl (unsubstituted or substituted with one to five C 1-6 alkyl groups) and di(C 1-6 alkyl) sulfonio-C 1-6 alkanoyl halide; or a salt thereof, which method comprises carbamoylating the compound of the formula wherein R 1 is as defined above. The method according to claim 1, wherein R 1 is 2-methyl-1-propenyl which may be substituted by hydroxy or di-C 1-3 alkylamino. The method according to claim 1, wherein R 1 is 2-methyl-1-propenyl which may be substituted by hydroxy and R 2 is carbamoyl which is substituted by monochloroacetyl or dichloroacetyl. The method according to claim 1, wherein the produced cornpound is selected from O-monochloroacetylcarbamoylfumagillol, O-dichloroacetylcarbamoylfumagillol, O-monochloroacetylcarbamoyldihydrofumagillol and O-monochloroacetylcarbamoyl-6'b-hydroxyfumagillol.

Inventors: FUJITA TAKESHI, KISHIMOTO SHOJI, FUJITA, TAKESHI, KISHIMOTO, SHOJI
Applicants: TAKEDA CHEMICAL INDUSTRIES LTD, TAKEDA CHEMICAL INDUSTRIES, LTD.
Application year: 1989
Main classification: C07D303
IPC codes: C07D521, A61K31, C07D303, C07D407, C07D417, C07D405