4-(4-{{1-[(4-Benzyloxy-phenyl)-carboxy-methyl]-2-oxo-azetidin-3-ylcarbamoyl}-[(Z)-hydroxyimino]-methyl}-phenoxy)-2-tert-butoxycarbonylamino-butyric acid 、
三氟乙酸 、
乙醚 在
乙醚 作用下,
以
苯 为溶剂,
反应 2.5h,
以to give 3-[2-{4-(3-amino-3-carboxypropoxy)phenyl}-2-hydroxyiminoacetamido]-1-(α-carboxy-4-benzyloxybenzyl)-2-azetidinone (180 mg), mp 164° to 167.5° C.的产率得到2-Amino-4-(4-{{1-[(4-benzyloxy-phenyl)-carboxy-methyl]-2-oxo-azetidin-3-ylcarbamoyl}-[(Z)-hydroxyimino]-methyl}-phenoxy)-butyric acid