(6
R)-3-acetoxymethyl-8-oxo-7
t-(2-phenyl-acetylamino)-(6
rH)-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid benzhydryl ester 在
吡啶 、
五氯化磷 作用下,
反应 2.0h,
生成
(6R)-3-acetoxymethyl-8-oxo-7t-(2-thiophen-2-yl-acetylamino)-(6rH)-5-oxa-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid