Conversion of C-terminal carboxy groups of N-protected α-amino acids to the corresponding 3,5-dinitrobenzoyl mixed anhydrides, followed by treatment with α-azido esters and trialkylphosphines, affords good yields of peptides, without appreciable formation of epimers even for reactions involving Phe–Val and Val–Val couplings and/or N-benzoyl α-amino acids.
N-保护的
α-氨基酸的C末端羧基转化为相应的3,5-
二硝基苯甲酰混合酐,随后与α-
叠氮基酯和三烷基膦反应,能够以良好的产率得到肽,即使在涉及 Phe-Val 和 Val-Val 偶联和/或N-苄基
α-氨基酸的反应中,也没有明显的旋光异构体形成。