2,2-dimethylpenam-3-carboxylic acid 1-oxide p-nitrobenzyl ester   、                                                                                      
2,5-二巯基噻二唑                                                                                                                                                                                              以
                                                                                         
1,4-二氧六环                                                                                  为溶剂,
                                                                                                                                                    反应 7.0h,
                                                                                                                以88%的产率得到(R)-3-Methyl-2-[2-(5-{1-[(R)-2-methyl-1-(4-nitro-benzyloxycarbonyl)-allyl]-4-oxo-azetidin-2-yldisulfanyl}-[1,3,4]thiadiazol-2-yldisulfanyl)-4-oxo-azetidin-1-yl]-but-3-enoic acid 4-nitro-benzyl ester