(5
R)-6-benzyloxycarbonylmethylene-3,3-dimethyl-7-oxo-(5
rH)-4-thia-1-aza-bicyclo[3.2.0]heptane-2
c-carboxylic acid 2,2,2-trichloro-ethyl ester                                                                                                                                                              在
                                                                                                                                         palladium on activated charcoal   、                                                                                                  rhodium on alumina                                                                                                                                                                                                                               
吡啶   、                                                                                                  
氢气   、                                                                                                  
N,N'-二异丙基碳二亚胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙酸乙酯                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 
(5R)-3,3-dimethyl-6t-naphthalen-2-yloxycarbonylmethyl-7-oxo-(5rH)-4-thia-1-aza-bicyclo[3.2.0]heptane-2c-carboxylic acid 2,2,2-trichloro-ethyl ester