4-nitrobenzyl (4R,5S,6S)-3-[(diphenylphosphono)oxy]-6-[(R)-1-hydroxyethyl]-4-methyl-7-oxo-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate 、
3-mercapto-N-aminosulfonyl-piperidine 以to give 13.7 g of the product with a yield of 50.8%的产率得到p-nitrobenzyl (4R,5S,6S)-3-[N-aminosulfonyl-piperidin-3-yl]thio-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-1-aza-bicyclo-[3.2.0]hept-2-ene-2-carboxylate