Benzyloxycarbonyl-asparagine → N-[3(S)-[[N-(benzyloxycarbonyl)-L-asparaginyl]amino]-2(R)-hydroxy-4-(4-methoxyphenyl)butyl]-L-proline tert.butyl ester

Participants

Reaction Steps

A solution of 730 mg of N-[3(S)-(benzyloxyformamido)-2(R)-hydroxy-4-(4-methoxyphenyl)butyl]-L-proline tert.butyl ester in 20 ml of ethanol was hydrogenated over 50 mg of 10% palladium-on-carbon for 2 hours. The catalyst was removed by filtration and the filtrate was evaporated to give an oil which was coupled with 340 mg of N-(benzyloxycarbonyl)-L-asparagine in a manner analogous to that described in Example 1. The crude product was chromatographed on a column of silica gel using 10% methanol in dichloromethane for the elution. There were obtained 82 mg of N-[3(S)-[[N-(benzyloxycarbonyl)-L-asparaginyl]amino]-2(R)-hydroxy-4-(4-methoxyphenyl)butyl]-L-proline tert.butyl ester as a white solid; MS: m/e 613 [M+H]+.

Provenance & Evidence