N1,N6-di<(1S)-3-methyl-1-(methoxycarbonyl)butyl>-(2R,3R,4R,5R)-2,5-di(benzyloxy)-3,4-dihydroxy-3,4-O-isopropylidenehexanediamide 在
盐酸 作用下,
以
甲醇 为溶剂,
反应 2.0h,
以73%的产率得到(S)-2-[(2R,3R,4R,5R)-2,5-Bis-benzyloxy-3,4-dihydroxy-5-((S)-1-methoxycarbonyl-3-methyl-butylcarbamoyl)-pentanoylamino]-4-methyl-pentanoic acid methyl ester