3-acetylmercapto-6-methyl-4-[[[1-(S)-[(methylamino)carbonyl]-2-(4-methoxyphenyl)ethyl]amino]carbonyl]heptanoic acid, methyl ester 在
ammonium hydroxide 作用下,
以
nitrogen-purged methanol 为溶剂,
以52%的产率得到3-Mercapto-6-methyl-4-[[[1-(S)-[(methylamino)carbonyl]-2-(4-methoxyphenyl)ethyl]amino]carbonyl]heptanoic acid methyl ester