p-nitrobenzyl (4R,5S,6S)-6-[1'(R)-hydroxyethyl]-4-methyl-3-silver mercapto-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate   、                                                                                      
4-[(chloromethyl)thio]benzamide                                                                                                                                                              在
                                                                                                                                                                                 
N,N-二异丙基乙胺   、                                                                                                  lithium iodide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
N-甲基乙酰胺                                                                                  为溶剂,
                                                                                                                                                                                        以0.322 g, (57.5%)的产率得到p-Nitrobenzyl (4R,5S,6S)-3-[[[(p-carbamoylphenyl)-thio]methyl]thio]-6-[1'(R)-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate