IL105439A - Mitomycin A and C derivatives substituted in the 1a position by an n-substituted succinamyl group and processes for the preparation thereof - Google Patents

Description

105,439/2 l mpf D nnin c-i A x?n-iu>n mT*7in MITOMYCIN A AND C DERIVATIVES SUBSTITUTED IN THE la POSITION BY A N-SUBSTITUTED SUCCINAMYL GROUP AND PROCESSES FOR THE PREPARATION THEREOF - 1 - 105,439/2 The present invention relates to mitomycin derivatives and to processes for the preparation thereof.

The present specification is divided from Israel Specification 91332, filed August 16, 1989.

In order that the present invention may be better understood and appreciated, description from Israel Specification 91332 is included herein, it being understood that this is for background purposes only, the subject matter of Israel Specification 91332 being specifically disclaimed and not forming a part of the present invention.

The mitomycins are a family of compounds having the following general formula (I): H2OCONH Mitomycins A, B and C are related to one another as set forth in Table 1 below, the designations X, Y and Z being those of formula I.

TABLE 1 Mitomycin: X Y z A -OCH3 -OCH3 -H B -OCH3 -OH C -NH2 -OCH3 -H Mitomycins are derived from mitosane compounds having the following skeleton (II): The mitosanes are formed during the cultivation of the microorganism Streptomvces caespitosus in a liquid nutrient medium under artificially controlled conditions. After separating the resulting mycellium, the various mitomycins may be isolated from the latter by active carbon or preferably non-ion exchange resin adsorption, organic solvent extraction or chromatography on alumina, as disclosed in U.S. Patent No. 3,660,578 to Hata et al .

Although the mitosanes are excellent antibiotics, they have limited utility due to their toxicity to human blood (see U.S. Patent No. 3,450,705 to Matsui et al . ) . The relatively highly toxic nature of the compounds has prompted search for derivatives of mitomycin to increase the antibiotic activity and to decrease toxicity. - 2a - For example, Matsui et al, U.S. Patent No. 3,450,705, discloses mitomycin compounds substituted at the 7-position with amino, lower alkylamino, phenylamino, or pyridyl, and substituted at the la position with haloalkanoyl, halobenzoyl, nitrobenzoyl, alkenoyl, acetyl glycyl, sorboyl, or acetyl methionyl.

Matsui et al, U.S. Patent No. 3,558,651, discloses mitosane derivatives comprising la-acyl-7-acyloxy-9a-methoxy compounds .

Chemical Abstracts 104:6136m (1986), (Japanese Application No. JP 600 1,197), discloses mitomycin derivatives characterized by glycosyl-substituted phenyl 7 derivatives at the N position. However, none of the compounds of the present invention comprises a mitomycin linked to a glycosyl moiety via a phenyl linker.

Chemical Abstracts 68:49581h discloses the mitomycin C derivative carbamate ester of 6- (cyclohexylamino) -1, la, 2 , 8 , 8a, 8b-hexahydro-8- (hydroxymethyl) -8a-methoxy-l , 5-dimethyl- azirino[2 · ,3 · :3,4]pyrrolo[l, 2-a] indole-4 , 7 dione.

However, none of the compounds of the present invention comprises a 6-cyclo- hexylamino mitomycin derivative.

Japanese Kokai Tokkyo Koko 63-246 336 discloses 7 mitomycin antibody complexes wherein the N position of the mitomycin is substituted by 2-ethanethiol and the antibody la is bound to mitomycin through the N position. However, this document does not disclose mitomycin derivatives linked 7 . at the N position via an ammo acid to an aminosaccharide. - 3 - Certain mitomycins and mitomycin derivatives also possess antitumor activity. Oboshl et al.. Gann £8_:315-321 (1967); Usubuchi et a!.. Gann 5£:307-313 (1967); Matsui et al.. J. Antibiotics XXI : 189- 198 (1968); Japanese Patent No. 68 06 627 to Matsui et al . (Chemical Abstracts £9_:86986k (1968)); and Cheng et al.. J. Med. Chem. £0:767- 770 (1977).

While mitomycin C is active against a relatively broad spectrum of experimental tumors, Its toxicity and myelosuppressive effects limit Its use 1n clinical practice (Mitomycin C: Current Status and New Developments. Carter et al . (eds.), Academic Press, 'New York (1979)). In preclinical and clinical studies, mitomycin C has shown activity ag¾inst a variety of murine and human neoplasms, but has also shown severe, delayed bone marrow toxicity. Goldin, A., et al .. NC I -' EORTC Symposium on Mitomycin C. Brussels, Belgium (1981).

In other studies, a combination of 5-fluorouracil , adriamycin and mitomycin C was found to be effective for the treatment of patients with advanced gastric and colorectal cancer. This regimen incorporated mitomycin C administration 1n a single dose schedule every two months, to decrease the treatment-limiting delayed myelosuppressive effects of the compound. Scheln, P.S., et al.. Mitomycin C: Current Status and New Developments, pp. 133-143, Carter ¾t ¾1 , (eds.), Academic Press, New York (1979).

Numerous synthetic derivatives of mitomycin C have been prepared in the hope of obtaining compounds with improved therapeutic properties. These derivatives include substitution on the azirldine ring, carbamoyl, or acyl group substitution on the hydroxymethyl side chain, and replacement of the 7- substituent in the quinone ring with other functional groups, especially substituted amines. However, as disclosed by Remers, U.S. Patent No. 4,268,676, none of these analogs have emerged as a clinical agent, with the possible exception of the 7-hydroxy analog of the mitomycin C, which has been involved in a recent study in Japan. This analog is asserted to be less leukopenic than mitomycin C, but is also less potent. Also disclosed by Remers, supra, are totally synthetic mitomycin analogs of the mitosane type (Mott et al . , J. Med. Chem. 21:493 (1978)), prepared mainly for their antibacterial activity.

Kinoshita, S., et al., J. Med. Chem. 14:103-112 (1971), disclose several derivatives of mitomycin substituted in the la, 7, and 9a positions. In particular, compounds substituted at the la position with sulfonyl, ortho-substituted benzoyl, and acyl derivatives were reported.

Iyengar, B.S., et al .. J. Med. Chem. 24:975-981 (1981), disclose a series of 31 mitomycin C and porfiromycin analogues with various substituents at the 7- and la-positions. The most active substituents at the 7-position included aziridine, 2-methylaziridine, propargyl -amine, furfuryl amine, methyl glycinate and 3-aminopyridine.

Iyengar, B. , et al . , J. Med. Chem. 26:16-20 (1983), disclose a series of 7-substituted mitomycin C and porfiromycin derivatives and the screening thereof in standard antitumor systems. The authors report that the 7- position controls the reduction of the quinone ring, thus suggesting that it would be possible to alter the substitution of the 7- position to gain selectivity between normal cells and certain cancer cells.

Iyengar, B.S., et al .. J. Med. Chem. 26:1453-1457 (1983), disclose 20 mitomycin C analogues substituted with secondary amines at the 7-position. Eleven of these analogues were more active than mitomycin C against P388 murine leukemia and two of these eleven were significantly less leukopenic. The authors report that no quantitative correlation between antitumor activity and physiochemical -5- properties of the analogues was evident, although the relative ease of quinone reduction may be related to activity.

Iyengar, B.S., et al .. J. Med. Chem. 29:.l864-1868 (1986), disclose the preparation of 7-substituted amino 1,2-aziridinomito-senes.. The authors reported that a methyl group on the aziridine nitrogen gave increased potency. The 7-amino mitosene derivatives which were difficult to reduce to hydroquinones were essentially inactive.

Sami, S., et al .. J. Hed. Chem. £7:701-708 (1984), disclose a series of 30 N7-phenyl -substituted mitomycin C analogs. Two of the compounds having pyrazolyl or aminopyridyl substituents at the 7-position were disclosed as clearly superior to mitomycin C in activity against P388 murine leukemia.

Sami, T., et al .. J. Hed. Chem. 22:247-250 (1979), also disclose N-(2-chloroethyl )-N-nitrosocarbamoyl derivatives of glycosylamines, including three disaccharide derivatives which exhibited strong antitumor activity against leukemia 1210 in mice. In addition, gl ucopyranose derivatives of N-nitrosoureas possess immunogenic and marrow-sparing properties. Anderson et al .. Cancer Research 35:761-765 (1975); Panasci et al .. J. Clin. Invest. 64:1103-1111 (1979).

In U.S. Patent No. 4,720,543, compounds having the following general formula (III) are disclosed: O III N-CS-NH 2 6 - 105,439/2 where R1 is selected from the group consisting of NH2, C^-C^ alkoxy and a glycosyl residue; and R2 is selected from hydrogen, C^-C* alkyl, and a glycosyl residue, ,with the proviso that either R1 or R2, but not both, contains a glycosyl group.

The mitomycin derivatives disclosed by U.S. Patent No. 4,720,543 are characterized by a thiourea substitution at the la-position and, additionally, glycosyl substitution at either the la- or 7-position. The combination of glycosidic residues and thiourea moieties has resulted in compounds possessing anti-neoplastic activity and reduced toxicity. However, in spite of the aforementioned mitomycin derivatives, a continuing need exists for additional derivatives having enhanced anti-neoplastic properties and low overall toxicity.

Israel Specification 91332, from which the present specification is divided, relates to a mitomycin derivative having the following general formula (IV): where i n n I s 0 or 1 ; Y i s selected from the group consi sting of deoxygl ucopyranosyl , deoxygal actopyranosyl , deoxymannopyranosyl , deoxyxylopyranosyl , deoxycel lobiosyl , deoxyl actosyl , deoxyglucofuranosyl , deoxymai tosyl , and l ,3-di hydroxycyclohex-2-yl , or a hydroxyl -protected peracetate deri vati ve thereof; - 7 - K is hydrogen; R is hydrogen, Cx-C4 alkyl or C^-C* alkyl substituted by phenyl, hydroxyphenyl, indolyl, mercapto, C -C4 alkylthio, hydroxy, carboxy, amino, guanidino, imidazolyl or carbamyl; or R and R1 together form a five or six membered nitrogen containing ring.

Said specification also relates to a process for preparing a mitomycin derivative having the formula (IV): wherein n is 1; Y is selected from the group consisting of deoxyglucopyrano- syl, deoxygalactopyranosyl, deoxymannopyranosyl, deoxyxylopyrano- syl, deoxycellobiosyl, deoxylactosyl, deoxyglucofuranosyl, deoxy- maltosyl, and 1 , 3-dihydroxycyclo-hex-2-yl, or a hydroxyl- protected peracetate derivative thereof; R is hydrogen; R1 is hydrogen, CX-C alkyl or Ci-C* alkyl substituted by phenyl, hydroxyphenyl , indolyl, mercapto, C -C* alkylthio, hydroxy, carboxy, amino, guanidino, imidazolyl or carbamyl; or - 8 105,439/2 R and R1 together form a five or six membered nitrogen containing ring; comprising: (a) condensing an N-protected amino acid with an alcohol in the presence of a dehydration reagent to give an activated ester, (b) condensing the activated ester obtained In step (a) with an amino compound to give a protected amino acid-amino compound con- Jugate, (c) removing the protecting group of the protected amino acid- amino compound conjugate obtained in step (b) to give an amino acid- amino compound conjugate, and (d) condensing the amino acid-amino compound conjugate obtained in step (c) with mitomycin A to give the mitomycin derivative.

The present invention relates to a mitomycin derivative having the following general formula (V): wherein n, R, R1 and Y are as defined above and R2 is NHL - or CH3O- The invention also relates to a' process for the preparation of a mitomycin derivative having the following formula (V): 9 - 105,439/3 wherein n is 0; Y is selected from the group consisting of glucopyranosyl, galactopyranosyl, mannopyranosyl , xylo- pyranosyl, cellobiosyl, lactosyl, glucofuranosyl, maltosyl, 1 , 3-dihydroxycyclohex-2-yl; R is hydrogen; R1 is hydrogen, Cx-C4 alkyl or Cx-C4 alkyl substituted by phenyl, hydroxyphenyl , indolyl, mercapto, Ci-C4 alkyl- thio, hydroxy, carboxy, amino, guanidino, imidazolyl or carbamyl, or R and R1 together form a five- or six-membered nitrogen-containing ring; R2 is NH2- or CH30; comprising: (a) condensation of mitomycin A or C with succinic anhydride to give mitomycin A or C-la-succinic acid amide; (b) condensation of the mitomycin A or C-la-succinic acid amide, obtained in step (a) with a hydroxyl-protected amino derivative selected from the group consisting · of glucosamine, ga1actosamine , mannosamine, xylosamine, cellobiosamine, maltosamine, and 2-amino-l,3-cyclohexane- diol; and (c) removal of the hydroxyl protecting groups to give the mitomycin derivative. - 10 - 105,439/3 The invention. ,-,iso relates to a process for the preparation of a mitomycin derivative having the following formula (V): wherein n is 0; Y is selected from the group consisting of glucopyranosyl , galactopyranosyl , mannopyranosyl , xylo-pyranosyl, cellobiosyl, lactosyl, glucofuranosyl, maltosyl, 1 , 3-dihydroxycyclohex-2-yl; R is hydrogen; R1 is hydrogen, Οχ-04 alkyl or Cx-C4 alkyl substituted by phenyl, hydroxyphenyl , indolyl, mercapto, Cx-C4 alkyl-thio, hydroxy, carboxy, amino, guanidino, i idazolyl or carbamyl, or R and R1 together form a five- or six-membered nitrogen-containing ring; R2 is H2- or CH3O-; comprising: (a) condensation of mitomycin A or C with succinic anhydride to give mitomycin A or C-la-succinic acid amide; (b) condensation of the mitomycin A or C-la-succinic acid amide obtained in step (a) with a hydroxyl-protected amino acid-saccharide conjugate of the formula (VIII): - 11 - 105,439/ 3 wherein R, R1 and n are as defined above, and Y? is a hydroxyl-protected saccharide selected from the group consisting of the hydroxyl-protected derivative of glucopyranosyl , galactopyranosyl , mannopyranosyl, xylopyranosyl, cellobiosyl, lactosyl, glucofuranosyl, maltosyl, and 1 , 3-dihydroxycyclohex-2-yl; and (c) removal of the hydroxyl protecting groups to give the mitomycin derivative.

In a further divisional Specification 105,400, filed concurrently with the present specification, there is described and claimed a mitomycin derivative having the following structural formula (VII): wherein R2 is as defined above; and R3 is a 2-(3-cyano-4-morpholinyl)-2-deoxypyranosyl saccharide or a 2-(4-morpholinyl)-2-deoxypyranosyl saccharide. - 12 - Said specification also relates to a process for the preparation of a mitomycin derivative having the formula (VI): wherein R2 is NH2- or CH3O-; and R3 is a 2-(3-cyano-4-morpholinyl)-2-deoxy saccharide; comprising 1 (a) condensing bis(acetaldehyde-2-yl ) ether with a 2-amino-2- deoxy saccharide in the presence of a salt of cyanoborohydride to give a 2-deoxy-2-(3-cyano-4-morpholinyl) saccharide and a 2-deoxy4· 2-deoxy-2-(4-morpholinyl) saccharide; (b) separation of the 2-deoxy-2- (3-cyano-4-morphol inyl ) 2-deoxy-2-(4-morphoJ.in l) . .. . , . saccharide from the /2 deoxy 4 morpholmyl saccharide obtained in step (a); (c) reaction of the 2-deoxy-2-(3-cyano-4-morpholinyl) saccharide obtained in step (b) with an acetyl halide to give a 2-deoxy l-halo-2- (3-cyano-4-morphol inyl ) peracetyl saccharide; (d) treatment of the 2-deoxy-l-halo-2-(3-cyano-4-morphol inyl ) peracetyl saccharide obtained in step (c) with silver thiocyanate to give a saccharide-l-thiocyanate; (e) reaction of the saccharide-l-thiocyanate obtained in step (d) with mitomycin C or mitomycin A to give a mitomycin C- or mitomycin A-saccharide peracetate carbothioamide; and (f) hydrolysis of the acetate groups of the mitomycin-C-sac-charide peracetate obtained in step (e) to give the mitomycin derivative.

Said invention also relates to a process for the preparation of a mitomycin derivative having the following formula (VI) 0 wherei n R2 is NH L- or CH3O-; 0 and 2„-d,eoxy-„2-(4-morp,hol.i.nyl) R3 is a' ( The invention will now be described with reference to the following description and examples, it being understood that only subject matter embraced in the scope of the claims appended hereto is intended to be included in the scope of the present invention, while subject matter of 105,440 Israel Specification 91332 and of the further divisional specification / filed concurrently herewith, although described and exemplified to provide background and better understanding of the present invention, is not intended for inclusion as part of the present invention. - 14 - DESCRIPTION OF THE PREFERRED EMBODIMENTS mitomycin derivatives of the mitomycin C. Mitomycin C may be prepared according to the methods generally disclosed 1n Cheng e_L ILL, J. Med. Chem. 2J&.767-770 (1977). Alternatively, mitomycin C can be obtained from mitomycin A by treatment of mitomycin A with a methanol 1c-ammon1a solution as described by Matsul, M., et al.. JL. Antibiotics XXI:189 (1968).

The mitomycin derivatives of Formula IV, wherein n-0 (X), may be obtained by displacement of the methoxy group of mitomycin A (VIII) with the amino group of an amino compound, for example, glucosamine (Y- H2; (IX)) under basic conditions 1n a polar organic solvent to give the N7-subst1tuted mitomycin derivative (X) (see Scheme I below).

Amino compounds (Y-NH2) which may be substituted at the 7- posltion include, but are not limited to glucosamine, galactosamine, mannosamlne, xylosamine, cellobiosamlne, maltosamine and 2-am1no-l,3-> cyclohexanediol and the hydroxyl-protected peracetate derivatives thereof. Preferably, the saccharide comprising the group "Y" is substituted at the 2-position with the amino group. Polar organic solvents which may be used in the practice of the Invention include methanol, ethanol, propanol, dimethylsulfoxide, and dimethylformamide. Suitable bases for providing the basic conditions of the reaction Include alkylamines such as C1-C3 trlalkyl amines, d11sopropylethyl- amine, l,8-d1azab1cyclo[5.4.0]undec-7-ene (DBU) and dimethylamino- pyridine (DMAP). In general, mitomycin A and the amino derivative are present 1n a 1:1 molar ratio, although excess amino derivative may be present. Sufficient base Is present in the reaction mixture to Insure that the reaction remains basic throughout. -15- Preferred mitomycin derivatives having Formula X include N7- (2-deoxyglucopyranos-2-yl) mitomycin C, N7- (2-deoxygalactopyranos-2-yl) mitomycin C, N7- (tetraacetyl-2-deoxyglucopyranos-2-yl) -mitomycin C, and N7- (tetraacetyl-2-deoxygalactopyranos-2-yl) -mitomycin C.

Scheme I -16- The amino acid linked mitomycin derivatives of formula IV, wherein n=l, may be prepared (Scheme II) from mitomycin A by condensation of the N-protected amino acid, for example, the N- benzyloxycarbonyl derivative (XI) , with an alcohol such as N- hydroxysucccinamide, which is capable of generating an activated ester, and a dehydrating reagent to give the activated ester (XII) . Dehydrating reagents which may be used in this process include, but are not limited to, dicyclohexylcarbodiimide (DCC) and diethylazodicarboxylate (DEAD) and triphenylphosphine. Treatment of the activated ester (XII) with any of the above- listed amino compounds (IX) gives the protected amino acid-amino compound conjugate (XIII) . Removal of the protecting group, for example by hydrogenolysis of the N-benzyloxycarbonyl group, gives the free amino derivative (XIV) . Compound (XIV) may then be condensed with mitomycin A (VIII) by displacement of -OCH^ as described above, to give the amino acid linked mitomycin derivative (IV) .

Preferred mitomycin derivatives having Formula (IV) , wherein n=l, R1=H and R=H, include 7 N - [ [ [ (2-deoxy-2-glucopyranosyl) ammo] carbonyl]methyl] 7 mitomycin C and N -[ [ [ (tetraacetyl-2-deoxy-2-glucopyranosyl) amino] carbonyl] ethyl] mitomycin C.

Preferably said N-protected amino acid is selected from the group consisting of the N-benzyloxycarbonyl derivatives of alanine, valine, leucine, isoleucine, proline, phenylalanine, tryptophan, methionine, glycine, serine, threonine, cysteine, tyrosine, asparagine, glutamine, aspartic acid.. glutamic acid, lysine, arginine and histidine.

Scheme 11 -18- 105,439/2 Mitomycin derivatives having Formula (V), wherein is H and n is 0 (Formula (XV), below), may be prepared (Scheme III) by condensation of mitomycin C (XVI) with succinic anhydride to give the amide (XVII) which may then be condensed with the hydroxyl -protected amino derivative YP-NH2 (X 111) using any of the above-listed dehydrating reagents followed by deprotection to give (XV). Protecting groups for the amino derivative include, but are not limited to, C2-C4 acyl esters.

Preferred mitomycin derivatives having Formula (XV) include N1- [[2-[[(2-deoxy - 2 - gl ucopyranosyl ) ami no] car bon 1 ] ethyl ] car ony 1 ] mitomycin C.

Scheme III - 19 - 105,439/3 Mitomycin derivatives having Formula (V), wherein is -OCH3 and n is 0 (Formula (XIX), below), may be prepared (Scheme IV) by treatment of mitomycin C (XVI) with sodium methoxide in absolute methanol to give mitomycin A (VIII) followed by condensation with succinic anhydride to give the mitomycin A-la-succinic acid amide (XX). Condensation of the carboxylic acid group of (XX) with the hydroxy! - protected amino derivative YP-NH (XVIII), as described above, followed by deprotection gives (XIX).

Preferred mitomycin derivatives having Formula XVIII include N*- [ [2- [ [ ( 2 - deoxy-2-gl ucopyranosyl ) ami no] carbonyl ] ethyl ] carbonyl ] mitomycin A.

Scheme IV -20- The mitomycin derivatives of Formula VI may be prepared according to the sequence depicted in Scheme V. Treatment of 3,4-dihydroxy-tetrahydrofuran (XXI) with aqueous sodium periodate in a polar organic solvent gives bis(acetaldehyde-2-yl ) ether (XXII) which may be condensed with a 2-amino-2-deoxy-saccharide (XXIII) in the presence of a salt of cyanoborohydride to give a mixture of 2-deoxy-2- (3-cyano-4- •morpholinyl) morpholino) saccharide ((XXIVa), Q = -CN), and II dcoxy 1 moppholiny' saccharide ((XXIVb) , Q = -H) which may be separated, for example, by column chromatography. Salts of cyanoborohydride may include any of the alkali metal salts of cyanoborohydride, preferably sodium cyanoborohydride.. Treatment acetyl halide gives saccharide which may b thiocyanate saccharide (XXV). Condensation of the thiocyanate (XXV) with mitomycin C (XVI) gives the mitomycin C-saccharide peracetate carbothioamide (XXVI). Deacylation of (XXVI), for example, with methanol ic ammonia, gives (VI) (Q = -CN or H) .

Preferred mitomycin derivatives having Formula VI include 2-(3-cyano-4-morphol inyl ) 2-deoxygl ucopyranosyl mitomycin-l a-carbothioamide and 2-(3-cyano-4-morpholinyl) -2-deoxygal actopyanosylmitomycin-l a-carbothioamide. -ai- lOS, 39/2 Scheme V XXIV 1. AcBr 2. AgSCN CH2OAc Nr½-CO- CH29 -22- The compounds of the invention may be present as pharmaceutically acceptable salts. Among the preferred anionic counter ions are those of the halides (derived from hydrohalic acids), such as chloride, bromide, or fluoride. Other anions include sulfonate, or p_-toluene-sulfonate.

As an antibiotic, the compounds of the present invention are useful against all microorganisms susceptible to the anti-bacterial action of the parent compounds, these microoganisms including, but Proteus. Salmonella. Shigella, Brucella, Mycobacterium. Nocardia, Saccharomyces. Candida. Penicill ium. and Aspergillus. Specific microorganism treatable with the compounds of the present invention include Pseudomonas aeruginosa. Staphylococcus aureus. Staphyl ococcus al bus . Staphylococcus citreus, Sarcina lutea, Diplococcus pneumoniae. Streptococcus hemolvticus. Streptococcus lactis, Corynebacteri um diphtheri ae. Hemophilus pertussis, Escherichia coli, Kl ebsi el 1 a pneumoniae, Proteus vulgaris. Salmonella typhosa. Salmonella paratyphi , Shigella dysenteriae. Brucella abortus. Brucella megatherium. Brucella mycoides. Brucella anthracius, Mycobacterium ATCC 607, Mycobacterium avium. Mycobacterium phlei, Nocardia asteroides. Saccharomyces cervisiae. Candida albicans, Penicillium glacum. and Aspergillus niger.

The mitomycin derivatives of the present invention are useful ijn vitro as antiseptics, i.e. for disinfecting. The compounds are also useful topically and internally as therapeutic agents in combating pathogenic bacteria, e.g. in cases of staphyloder atitis, bacterial pneumoniae, leptopserosis, rickettsiosis, salmonellosis, and the like.

Typically, for topical application, the mitomycins of this invention are applied in compositions having concentrations in the range of 0.01 to 1000 ug/ral . yg/ml.

As antineoplastic agents, the compounds of the present invention are useful in treating a variety of cancers, including, but not -23- limited to, those cancers susceptible to cell growth suppression by the parent compounds. Treatment of cancers with the parent compounds are described in the following references: Driscoll, J.S. et al .. Cancer Chemotherapy Rep. 4:1 (1974).

Kojima, R., et al . , Cancer Chemotherapy Rep. 3:111 (1972).

Sugiura, . , Cancer Res. 19:438 (1959).

Oboshi, S., et al .. Gann 58:315 (1967).

Sugiura, K., Cancer Chemotherapy Rep. 13:51 (1961).

Venditti, J.M., et al . , Advances in Cancer Chemotherapy, pp. 201- 209 (1978) Editors: H. Umezawa et al . , Japan Soc. Press, Tokyo/Univ. Park Press, Baltimore.

Usubuchi, I., et al .. Gann 58:307 (1967).

Typical cancers treated by the mitomycin derivatives of this invention include, but are not limited to gastric and pancreatic neoplasms (Schein, P.S. et al .. in Mitomycin C: Current Status and New Developments, pp. 133-143, Carter et al . Eds., Academic Press, New York (1979)). Other cancers that may be treated using the compounds of the invention include lung, breast, anal, colorectal, head and t neck, and melanoma.

The compounds of the invention are also active against the following tumor systems: Leukemia L-1210, Leukemia P388, P1534 leukemia, Friend Virus Leukemia, Leukemia L4946, Mecca lymphosarcoma, Gardner lymphosarcoma, Ridgway Osteogenic sarcoma, Sarcoma 180 (ascites), Wagner osteogenic sarcoma, Sarcoma T241, Lewis lung carcinoma, Carcinoma 755, CD8F, Mammary Carcinoma, Colon 38, Carcinoma 1025, Ehrlich carcinoma (ascites & solid), Krubs 2 carcinoma (ascites), Bashford carcinoma 63, Adenocarcinoma E 0771, B16 Melanoma, Hardin-Passey melanoma, Giloma 26, Miyona adenocarcinoma, Walker carcinosarcoma 256, Flexner-Jobl ing carcinoma, Jensen sarcoma, Iglesias sarcoma, Iglesias ovarian tumor, Murphy-Sturn lymphosarcoma, Yoshida sarcoma, Dunning leukemia, Rous chicken sarcoma, and Crabb hamster sarcoma.

The pharmaceutical compositions of the present invention may be administered by any means that achieve their intended purpose. For example, administration may be by parenteral, subcutaneous, intravenous, intramuscular, intraperitoneal, transdermal, or buccal routes. Alternatively, or concurrently, administration may be by the oral route. The dosage administered will be dependent upon the age, health, and weight of the recipient, kind of concurrent treatment, if any, frequency of treatment, and the nature of the effect desired.

Compositions within the scope of this invention include all compositions wherein the mitomycin derivative is contained in an amount effective to achieve its intended purpose. While individual needs vary, determination of optimal ranges of effective amounts of each component is with the skill of the art. Typical dosage forms contain 10 to 300 imole/kg animal of the mitomycin derivative, or an equivalent amount of the pharmaceutically acceptable salt thereof.

In addition to the pharmacologically active compounds, the new pharmaceutical preparations may contain suitable pharmaceutically acceptable carriers comprising excipients and auxiliaries which facilitate processing of the active compounds into preparations which can be used pharmaceutically. Preferably, the preparations, particularly those preparations which can be administered orally and which can be used for the preferred type of administration, such as tablets, dragees, and capsules, and also preparations which can be administered rectally, such as suppositories, as well as suitable solutions for administration by injection or orally, contain from about 0.01 to 99 percent, preferably from about 25 to 75 percent of active compound(s), together with the excipient.

The pharmaceutical preparations of the present invention are manufactured in a manner which is itself known, for example, by means of conventional mixing, granulating, dragee-making, dissolving, or lyophilizing processes. Thus, pharmaceutical preparations for oral use can be obtained by combining the active compounds with solid excipients, optionally grinding the resulting mixture and processing -25- the mixture of granules, after adding suitable auxiliaries, if desired or necessary, to obtain tablets or dragee cores.

Suitable excipients are, in particular, fillers such as saccharides, for example lactose or sucrose, mannitol or sorbitol, cellulose preparations and/or calcium phosphates, for example tri-calcium phosphate or calcium hydrogen phosphate, as well as binders such as starch paste, using, for example, maize starch, wheat starch, rice starch, potato starch, gelatin, tragacanth, methyl cellulose, hydroxypropylmethylcellulose, sodium carboxymethylcellulose, and/or polyvinyl pyrrol idone. If desired, disintegrating agents may be added such as the above-mentioned starches and also carboxymethyl -starch, cross-linked polyvinyl pyrrol idone, agar, or alginic acid or a salt thereof, such as sodium alginate. Auxiliaries are, above all, flow-regulating agents and lubricants, for example, silica, talc, steric acid or salts thereof, such as magnesium stearate or calcium stearate, and/or polyethylene glycol. Dragee cores are provided with suitable coatings which, if desired, are resistant to gastric juices. For this purpose, concentrated saccharide solutions may be used, which may optionally contain gum arabic, talc, polyvinyl pyrrol idone, polyethylene glycol and/or titanium dioxide, lacquer solutions and suitable organic solvents or solvent mixtures. In order to produce coatings resistant to gastric juices, solutions of suitable cellulose preparations such as acetylcellulose phthalate or hydroxypropymethyl -cellulose phthalate, are used. Dye stuffs or pigments may be added to the tablets or dragee coatings, for example, for identification or in order to characterize combinations of active compound doses.

Other pharmaceutical preparations which can be used orally include push-fit capsules made of gelatin, as well as soft, sealed capsules made of gelatin and a plasticizer such as glycerol or sorbitol. The push-fit capsules can contain the active compounds in the form of granules which may be mixed with fillers such as lactose, binders such as starches, and/or lubricants such as talc or magnesium stearate and, optionally, stabilizers. In soft capsules, the active - 26 - compounds are preferably dissolved or suspended in suitable liquids, such as fatty oils, or liquid paraffin. In addition, stabilizers may be added.

Possible pharmaceutical preparations which can be used rectally include, for example, suppositories, which consist of a combination of the active compounds with a suppository base. Suitable suppository bases are, for example, natural or synthetic triglycerides, or paraffin hydrocarbons. In addition, it is also possible to use gelatin rectal capsules which consist of a combination of the active compounds with a base. Possible base materials include, for example, liquid triglycerides, polyethylene glycols, or paraffin hydrocarbons.

Suitable formulations for parenteral administration include aqueous solutions of the active compounds in water-soluble form, for example, water-soluble salts. In addition, suspensions of the active compounds as appropriate oily injection suspensions may be administered. Suitable lipophilic solvents or vehicles include fatty oils, for example, sesame oil, or synthetic fatty acid esters, for example, ethyl oleate or triglycerides. Aqueous injection suspensions may contain substances which increase the viscosity of the suspension include, for example, sodium carboxymethyl cellulose, sorbitol, and/or dextran. Optionally, the suspension may also contain stabilizers. - 27 - EWUS Example 1; Preparation of Mitomycin A Mitomycin C (50 mg, 0.15 mmol) was dissolved in 3 ml of a solution of 50% methanol and 50% 0.1 N NaOH and stirred at room temperature for 18 hrs. After completion of the reaction „(TLC, CHCl3:Me0H, 10:1), the reaction mixture was quenched with dry ice to neutralize sodium hydroxide. The mixture was then freeze-drled in vacuo, and the mitosane compound was removed with methanol. The methanol solution was concentrated 1n vacuo to dryness, and the residue was redlssolved 1n a minimum amount of methanol and then precipitated with ether to give 20 mg of a red-purpl1sh powder. This was dissolved 1n 15 ml of ethyl acetate and cooled to 5*C, treated with dlazomethane (etherlal solution of diazomethane was prepared according to the procedure of Arndt, Org. Synthesis. Collective Volume II, pp. 165-167), and stirred for 20 minutes (TLC, CHCl3:MeOH, 10:1). After completion of the reaction, the solvent was first removed under water aspirator reduced pressure and then dried in vacuo. The residue was recrystallized from ether to give 18 mg of reddish needles, m.p. ' 159-160'C. TLC (EtOAc:acetone, 1:1) gave one spot Rf - 0.91, and (acetone-.benzene, 4:1) one spot Rf - 0.48. UV (methanol) 216 and 358 mu. NMR (acetone-d6, middle peak of acetone at 2.10), 5, 5.94 (br, 2H); 4.76 (dd, 1H); 4.38 (t, 1H); 4.07 (s, 3H); 3.96 (d, 1H) ; 3.5 (dd, 1H); 3.41 (d, 1H) 3.35 (d, 1H); 3.25 (s, 3H); 2.99-2.264 (mmm) ; 2.87 (s); 1.640 (s, 3H). _^ N^-(2-deoxyglucopyranos-2-yl) mitomycin C Example 2: Preparation of/ 1 (2 de-eityRluoopyrcno i."yl)mit;omycin C.

To a solution of mitomycin A (10 mg, 0.028 mmol) in absolute methanol was added a raethanolic solution of glucosamine HC1 (70 mg, μΐ 0.325 mmol) and diisopropylethylamine (ΙΟΟ/iwi·). This mixture was stirred under Ν» atmosphere at room temperature until the reaction was -28- complete by TLC (EtOAc: acetone, 1:1), at which time (10 hrs.) the solution had changed color from reddish to dark purple. The solution was concentrated by evaporation with a N2 stream and chromatographed on a preparative silica plate eluted with acetone-ethyl acetate (1:1). The purple band remaining close to the origin was scraped off and eluted with methanol. Further purification by HPLC (Cjg reversed phase, semi -preparative column, methanol: O.IK phosphate buffer, 1:1) gave a purple powder, NMR (D20) 6 5.32 (d, 1H, saccharide anomeric H); 3.85 (s, 3H, 9a-0CH3); and the disappearance of singlet at 4.09 (Hatsui, H. , et al .. J. Antibiot. 21: 189 (1968); Cheng, L . , and Remers, W.A., J. Med. Chem. 20:767 (1977); Vyas, D.H., et al .. J. Org. Chem. 51:4307 (1986)).

Example 3: Preparation of N-(2.6-D1hvdroxycvclohexyl Iqlvcinamide To a solution of N-benzyloxycarbonylglycine (3 g, 14.3 'mmol) in dioxane was added N-hydroxysucc1n1m1de (1.65 g, 14.3 mmol) and N.N- dicyclohexylcarbodi imide (2.96 g, 14.3 mmol) with cooling. The reaction mixture was stirred at 0-5*C for one hour and allowed to . stand under refrigeration overnight. The urea precipitate was removed by suction filtration and the filtrate was concentrated In vacuo to dryness. The yellowish residue was recrystal lized from ethyl acetate- ether to give an 84% yield of the glycine activated ester mp. 112- 114'C. NMR (CHCI3).

The above-prepared activated ester of glycine (25 g, 0.008 mol) was dissolved in 15 ml of dry DMF (dimethyl formamide) , chilled to below 5°C, and 2-amino-l , 3-dihydroxy-/fayclohcii,dno' 2 yl (2.18 g, 0.016 mol) in DMF was added drop-wise with stirring under N2 atmosphere. After completion of the reaction (TLC, CHCl3:MeOH, 10:1), DMF was removed under reduced pressure and the resulting solid residue was crystallized from ethyl acetate to give white crystals in 84% yield, m.p. 170-172°C. NMR (D20) : δ 7.45 (s, 5H, aromatic H) ; 5.20 (s, 2H, benzylic-CH2) ; 3.95 (s, 2H, -CO-CH2-NH2) ; 3.6 (t, 1H, ^H of cyclohexane ring); 3.45 - 29- (m, 2H , C2H and C5H of cyclohexane ring); 2.0, 1.8 and 1.35 (m.m.m, 2 to 1 to 3H ; C3 , C4 and C5 hydrogens of cyclohexane). The product comprises the N-protected benzyloxycarbonyl derivative of N- ( 2 , 6 - dihyroxycyclohexyl )glydnam1de.

N-protected benzyloxycarbonyl N-(2,6-d1hydroxycyclohexyl) glycinamide (3g, 0.093 mol) was dissolved in 100 ml of absolute ethanol with a molar equivalent of 10% HC1. Hydrogenolysls with 5¾ Pd/C at 30 psi, removal of the catalyst over/oo c, and subsequent evaporation of solvents in vacuo yielded a pale brownish solid which was triturated with ether and recrystallized from ethyl acetate and ether, m.p. 207-210"C. NHR (D20) S, 3.65 (t, 3H, CjH of cyclohexane ring); 3.55 (m, 2H, C2H and C6H of cyclohexane); 3.4 (s, 2H, -C0-CH2- NH2 ) ; 2.05, 1.80, and 1.38 (m,m,m, 2 to 1 to 3H, hydrogens of C3 , C 4 and C 5 of cyclohexane).

Example 4 Animal Studies 7 The compound N - (2-deoxyglucopyranos-2-yl) mitomycin C, prepared according to Example 2, was evaluated for both murine P388 leukemia antitumor activity and toxicity to bone marrow in normal mice.

A. Determination of Murine Antitumor Activity The murine P388 leukemia system, maintained intra-peritoneally in female DBA/2 mice, was used to evaluate antitumor activity. This tumor was selected because of its known sensitivity to the parent compound, mitomycin C (Driscoll, et al., Cancer Chemotherapy Reports 4 : 1 (1974)). 7 . . . .

N - (2-deoxygluco-pyranos-2-yl) mitomycin C was dissolved in sterile water (at 4°C) immediately prior to administration.

Mitomycin C was dissolved in ethanol, and the resultant solution was adjusted to 5% ethanol, 95% sterile water. -30- Each compound was administered intraperitoneal]^ to groups of CD2F male mice on Day 1 after intraperitoneal implantation of 1 x 10 P388 leukemia cells. The P388 antileukemic activity of the test compound was assessed by mean survival days and percentage increased life span (ILS) . The % ILS was calculated as follows: %ILS = (T-C)/C x 100 where T is the mean survival days of the treated mice and C is the mean survival days of the untreated mice.

P388 antitumor acti .vi.ty for N7- (2-deoxyglucopyranos-2-yl) -mitomycin C, in comparison with the parent mitomycin C, is summarized in Table 2: TABLE 2 Antitumor Activity against P388 Leukemia Drug Dose (mg/kg) %ILS Mean Survival jdays) y -(2-deoxy- 5 42% 14.2 glucopyranos- 2-yl) mitomycin C 13.5 61% 16.1 Mitomycin C 4.5b 81% 18.1 Control0 10.0 Treated with druug vehicle B. Determination of the Effects of N~ 7- (2- deoxyglucopyranos-2-yl) mitomycin C on the Hematopoietic System in Mice Measurement of peripheral leukocyte (WBC) count was performed using a 20-μ1 sample of retro-orbital sinus blood obtained from normal CD2F1 male mice on Day 3 following i.p. admi .ni.strati.on of 13.5 mg/kg of N7- (2-deoxyglucopyranos -2-yl)- mitomycin C or 4.5 mg/kg of mitomycin C.

Blood samples obtained were diluted in 9.98 ml of Isoton (a neutral, isotonic buffer solution) and counted in a Coulter counter after lysis with Zapoglobin (an enzyme solution which lyses red blood cells, but not white blood cells) . WBC counts are expressed as a percentage of values from control mice receiving drug vehicle only. The results are summarized in the following Table 3: TABLE 3 In Vivo Murine WBC Depression WBC Count on Day 3 Drug Dose (mg/kg) (as percent of control) W yr - (2-deoxy- 13.5 mg/kg 94% glucopyranos- 2-yl) mitomycin C Mitomycin C 4.5 mg/kg 56-66% In summary, these in vivo studies demonstrate that N7- (2-deoxyglucopyranos-2-yl) mitomycin C has significant activity against the murine P388 tumor system, at doses producing no significant bone marrow toxicity, as determined by depression of peripheral leukocyte (WBC) count.

Example 5: Antibacterial Activity N7- (2-deoxyglucopyranos-2-yl) mitomycin C was evaluated for activity against Gram-negative bacteria, in a comparative study with the parent mitomycin C. Minimum negative inhibition concentration (M.I.C.) against a Gram na . .1vo strain of bacteria (HB101) was estimated by the dilution method, with graded concentrations of drug added to agar at 7 37-40°C. N - (2-deoxyglucopyranos-2-yl) - mitomycin C was dissolved in 50% sterile water - 50% ethanol at 4°C, and mitomycin C was dissolved in ethanol. The agar, containing drug, quickly solidified at room temperature, and the bacteria were plated immediately. After 24 hours at 37 °C, the agar plates were observed for inhibition of bacterial growth. The results are summarized in Table 4: TABLE 4 M· I · C · Compound Gram-negative Bacteria 7 N - (2-deoxyglucopyranos-2-yl) - 1.66-3.3 mcg/ml mitomycin C Mitomycin C 0.3-0.5 mcg/ml Having now fully described this invention, it will be understood by those of skill in the art that the same can be performed within a wide and equivalent range of conditions, formulations and other parameters without affecting the scope of the invention or any embodiment thereof.

Claims (5)

105,439/2 WHAT IS CLAIMED IS:

1. Λ ini tomy in derivative having the formula wherein, n is 0 or 1; Y is selected from the group consisting of glucopyranosyl, galactopyranosyl , mannopyranosyl , xylopyranosyl , cellobiosyl , lactosyl , glucofuranosyl , maltosyl, and Ϊ ,3-dihydroxycyclohex-2-yl or the hydroxy-protected acetate derivative thereof; R is hydrogen; R1 is hydrogen, C,-C_, alkyl or Ct-CA alkyl substituted by phenyl, hydroxyphenyl , indolyl, mercapto, C^-C^ alkylthio, hydroxy, carboxy, amino, guanidino, imidazolyl or carbamyl ; or R and Rj form a five or six membered ring containing nitrogen; and R2 is NH2 or CH30-, or a pharmaceutically acceptable salt thereof.

2. The mitomycin derivative of claim 1, comprising Nx[[2-[[(2-deoxyglucopyranosyl )amino]carbonyl]ethyl]-carbonyl] mitomycin C.

3. The mitomycin derivative of claim 1, comprising N1-[[2-[[(2-deoxycjlucopyranosyl )amino]carbonyl]eth l ]carbonyl]mi tomycin A. - 34 - 105,439/3

4. A process for the preparation of a mitomycin derivative having the following formula (V): wherein n is 0; Y is selected from the group consisting of glucopyranosyl, galactopyranosyl, mannopyranosyl , xylo-pyranosyl, cellobiosyl, lactosyl, glucofuranosyl , maltosyl, 1 , 3-dihydroxycyclohex-2-yl; R is hydrogen; R1 is hydrogen, Cx-C alkyl or Cx-C4 alkyl substituted by phenyl, hydroxyphenyl, indolyl, mercapto, C^-C* alkyl-thio, hydroxy, carboxy, amino, guanidino, imidazolyl or carbamyl, or R and R1 together form a five- or six-membered nitrogen-containing ring; R2 is NH2- or CH30; comprising: (a) condensation of mitomycin A or C with succinic anhydride to give mitomycin A or C-la-succinic acid amide; (b) condensation of the mitomycin A or C-la-succinic acid amide obtained in step (a) with a hydroxy1-protected amino derivative selected from the group consisting of glucosamine, galactosamine, mannosamine, xylosamine, cellobiosamine , maltosamine, and 2-amino-l , 3-cyclohexane-diol; and - 35 - 105,439/3 (c) removal of the hydroxy 1 protecting groups to give the mitomycin derivative.

5. A process for the preparation of mitomycin derivative having the following formula (V): o wherein n is 0 ; Y is selected from the group consisting of glucopyranosyl , galactopyranosyl , mannopyranosyl , xylo-pyranosyl, cellobiosyl, lactosyl, glucofuranosyl, maltosyl, 1 , 3-dihydroxycyclohex-2-yl; R is hydrogen; R1 is hydrogen, Cx-C* alkyl or C -C4 alkyl substituted by phenyl, hydroxyphenyl , indolyl, mercapto, C^-C^ alkyl-thio, hydroxy, carboxy, amino, guanidino, imidazolyl or carbamyl, or R and R1 together form a five- or six-membered nitrogen-containing ring; R* is NH2- or CHaO-; comprising : (a) condensation of mitomycin A or C with succinic anhydride to give mitomycin A or C-la-succinic acid amide; (b) condensation of the mitomycin A or C-la-succinic acid amide obtained in step (a) with a hydroxyl-protected amino acid-saccharide conjugate of the formula (VIII): - 36 - wherein R, R1 and n are as defined above and Y is a hydroxyl-protected saccharide selected from the group consisting of the hydroxyl -protected derivative df gl ucopyranosyl , galactopyranosyl , mannopyranosyl , xylopyranosyl , eel lobiosyl , 1 ,3-dihydroxycyclohex-z-yl lactosyl, glucofuranosyl, maltosyl, and/1,3 eyelahtManadiel £! yl ; and (c) removal of the hydroxyl protecting groups to give the mitomycin derivative. For the Applicant WOLFF, BREGMAN AND GOLLER