(1S,4S,7S,8R)-2,2-Bis-(2-chloro-acetoxymethyl)-7-ethoxycarbonylmethyl-6-[4-(4-methoxy-benzyloxy)-butyl]-5-oxo-6,11-diaza-tricyclo[5.4.0.0
4,8]undecane-11-carboxylic acid tert-butyl ester 在
甲醇 、
potassium carbonate 作用下,
以95%的产率得到(1S,4S,7S,8R)-7-Ethoxycarbonylmethyl-2,2-bis-hydroxymethyl-6-[4-(4-methoxy-benzyloxy)-butyl]-5-oxo-6,11-diaza-tricyclo[5.4.0.0
4,8]undecane-11-carboxylic acid tert-butyl ester