N-carbonyl-L-phenylalanine benzyl ester 、 N-<(1-methoxycarbonyl-3-methylbutyl)carbamoyl>-L-valyl-L-prolyl-α-azanorvaline benzyl ester 以
氯仿 为溶剂,
以73.6%的产率得到N-<(1S)-(1-methoxycarbonyl-3-methylbutyl)carbamoyl>-L-valyl-L-prolyl-α-azanorvaline benzyl ester