p-nitrobenzyl (2R,4R,5S,6S)-6-[1'(R)-hydroxyethyl]-4-methyl-3,7-dioxo-1-azabicyclo[3.2.0]heptan-2-carboxylate 、
cyclohepten-1-yl(tri-n-butyl)tin 以38.4%的产率得到4-Nitrobenzyl (1S,5R,6S)-2-(cyclohepten-1-yl)-6-((1R)-1-hydroxyethyl)-1-methylcarbapen-2-em-3-carboxylate