4-(4,5-Dimethyl-2,6-dioxo-3,6-dihydro-2H-pyrimidin-1-yl)-butyryl chloride 在
吡啶 作用下,
以
二氯甲烷 、
甲苯 为溶剂,
生成 (5R,6S)-6-((R)-1-Allyloxycarbonyloxy-ethyl)-3-[3-(4,5-dimethyl-2,6-dioxo-3,6-dihydro-2H-pyrimidin-1-yl)-propyl]-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid allyl ester