(3S,4R)-3-<(4S)-4-methyl-2-oxo-1,3-dioxolan-4-yl>-4-<(1R)-1-methylallyl>-2-azetidinone 在
三乙胺 、
间氯过氧苯甲酸 作用下,
生成 Hydroxy-[(2R,3S)-3-((S)-4-methyl-2-oxo-[1,3]dioxolan-4-yl)-2-((S)-1-oxiranyl-ethyl)-4-oxo-azetidin-1-yl]-acetic acid 4-methoxy-benzyl ester