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]pyridine 在
N,N-二异丙基乙胺 、 lithium iodide 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以52%的产率得到p-Nitrobenzyl (4R,5S,6S)-6-[1'(R)-hydroxyethyl]-4-methyl-3-[[[(pyridin-4-yl) thio]methyl]thio]-7-oxo-1-azabicyclo[3.2.0]-hept-2-ene-2-carboxylate