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