(5,6-Dimethyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-acetyl 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-(5,6-dimethyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-ylmethyl)-7-oxo-4-thia-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid allyl ester