N-甲基马来酰亚胺 、
2-{[1-[(2S,3R)-3-Benzyloxy-1-(2,2-dimethoxy-ethyl)-4-oxo-azetidin-2-yl]-meth-(E)-ylidene]-amino}-propionic acid methyl ester 在
silver(I) acetate 、
三乙胺 作用下,
以
甲苯 为溶剂,
反应 7.0h,
生成 endo-methyl 3-(S)-[cis-3-benzyloxy-1-(2,2-dimethyloxyethyl)-4-oxo-azetidin-2-(S)-yl]-1,5-dimethyl-4,6-dioxooctahydro-pyrrolo[3,4-c]pyrrole-1-carboxylate 、 endo-methyl 3-(R)-[cis-3-benzyloxy-1-(2,2-dimethyloxyethyl)-4-oxo-azetidin-2-(S)-yl]-1,5-dimethyl-4,6-dioxooctahydro-pyrrolo[3,4-c]pyrrole-1-carboxylate