[(3S,4R,3'S,4'R)-4-Benzo[1,3]dioxol-5-yl-4'-(3,4-dimethoxy-phenyl)-2,2'-dioxo-3-(2-phenoxy-acetylamino)-[1,3']biazetidinyl-1'-yl]-acetic acid ethyl ester 在
sodium hydroxide 作用下,
以
丙酮 为溶剂,
以55%的产率得到[(3S,4R,3'S,4'R)-4-Benzo[1,3]dioxol-5-yl-4'-(3,4-dimethoxy-phenyl)-2,2'-dioxo-3-(2-phenoxy-acetylamino)-[1,3']biazetidinyl-1'-yl]-acetic acid