(6
R)-7
c-methoxy-3-methyl-8-oxo-7
t-(Ξ
a)-styrylideneamino-(6
rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester 在
三氟乙酸 作用下,
生成
(6R)-7c-methoxy-3-methyl-8-oxo-7t-(2-phenyl-acetylamino)-(6rH)-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid methyl ester