、
(S)-methyl 4-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-2-(1-(2-methoxy-2-oxoethyl)-1H-1,2,3-triazole-4-carboxamido)butanoate 、 、
间羟基苯甲醛 以producing (S,E)-methyl 4-((3-hydroxybenzylidene)amino)-2-(1-(2-methoxy-2-oxoethyl)-1H-1,2,3-triazole-4-carboxamido)butanoate (28) which的产率得到