甲氧羰基亚甲基三苯基正膦 、
tert-butyl 7-[(Z)-(acetyl)methylene]cephalosporanate sulfone 以
二氯甲烷 为溶剂,
反应 2.0h,
生成 (R)-3-Acetoxymethyl-7-[(Z)-3-methoxycarbonyl-2-methyl-prop-2-en-(Z)-ylidene]-5,5,8-trioxo-5λ
6-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid tert-butyl ester 、 (R)-3-Acetoxymethyl-7-[(E)-3-methoxycarbonyl-2-methyl-prop-2-en-(Z)-ylidene]-5,5,8-trioxo-5λ
6-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid tert-butyl ester