PROCESS FOR THE PREPARATION OF ETHYL 3S-[[4-[[4-(AMINOIMINOMETHYL)PHENYL]AMINO]-1,4-DIOXOBUTYL]AMINO]-4-PENTYNOATE

• Main Authors: MEDICH, JOHN, R, HAGEN, TIMOTHY, J, HALLINAN, E., ANN, CAIN-JANICKI, KIMBERLY, J, BEHLING, JAMES, R, TSYMBALOV, SOFYA, STAHL, GLENN, L, PILIPAUSKAS, DANIEL, R, PETERSON, KAREN, B, MC LAUGHLIN, KATHLEEN, T, BOYS, MARK, L, FARID, PAYMAN, HANSEN, DONALD, W., JR, NUGENT, SEAN, T, ORLOVSKI, VLASDISLAV, BABU, SRINIVASAN, PITZELE, BARNETT, S, KORTE, DONALD, E, PARK, JUNG, M, BABIAK, KEVIN, A, DOUBLEDAY, WENDELL, W
• Format: Patent
• Language: English; French; German
• Published: 06.05.1998
• Edition: 6
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; APPARATUS THEREFOR; CHEMISTRY; GENERAL METHODS OF ORGANIC CHEMISTRY; METALLURGY; ORGANIC CHEMISTRY

The present invention relates to a novel process for the preparation of ethyl 3S-[[4-[[4-(aminoiminomethyl)phenyl]amino]-1,4-dioxobutyl]amino]-4-pentynoate and pharmaceutically acceptable acid addition salt thereof which comprises treating (trimethylsilyl)acetylene sequentially with n-butyllithium and 4-formylmorpholine followed by acid hydrolysis to give 3-(trimethylsilyl)-2-propynal; treating 3-(trimethylsilyl)-2-propynal with lithium bis(trimethylsilyl)amide to give in situ N,3-bis(trimethylsilyl)-2-propyn-1-imine; condensation of N,3-bis(trimethylsilyl)-2-propyn-1-imine with lithium t-butyl acetate to give (+/-)1,1-dimethylethyl 3-amino-5-(trimethylsilyl)-4-pentynoate; treating (+/-)1,1-dimethylethyl 3-amino-5-(trimethylsilyl)-4-pentynoate- with p-toluenesulfonic acid to give (+/-)1,1-dimethylethyl 3-amino-5-(trimethylsilyl)-4-pentynoate, mono p-toluenesulfonic acid salt, treatment of resulting salt with ethanol in the presence of p-toluenesulfonic acid to give (+/-)ethyl 3-amino-5-(trimethylsilyl)-4-pentynoate; desilylation of (+/-)ethyl 3-amino-5-(trimethylsilyl)-4-pentynoate to give in situ (+/-)ethyl 3-amino-4-pentynoate; resolution of (+/-)ethyl 3-amino-4-pentynoate using (R)-(-)-mandelic acid and treatment of the resolved product with gaseous hydrochloric acid to give ethyl 3S-amino-4-pentynoate, monohydrochloride; coupling the ethyl 3S-amino-4-pentynoate, monohydrochloride to 4-[[4-(aminoiminomethyl)phenyl]amino]-4-oxobutanoic acid, monohydrochloride in the presence of isobutyl chloroformate and N-methylmorpholine to give ethyl 3S-[[4-[[4-(aminoiminomethyl)phenyl]amino]-1,4-dioxobutyl]amino]-4-pentynoate, monohydrochloride.