2-(biphenyl-4-yl)propan-2-yl 2-aminoethylcarbamate 、
benzhydryl (2S,3R,5R)-3-methyl-3-[(4-nitrophenoxy)carbonyloxymethyl]-6-[[4-(4-nitrophenoxy)carbonylpyridin-2-yl]methylidene]-4,4,7-trioxo-4lambda6-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate 在
吡啶 作用下,
以72%的产率得到benzhydryl (2S,3R,5R)-3-methyl-4,4,7-trioxo-3-[2-[2-(4-phenylphenyl)propan-2-yloxycarbonylamino]ethylcarbamoyloxymethyl]-6-[[4-[2-[2-(4-phenylphenyl)propan-2-yloxycarbonylamino]ethylcarbamoyl]pyridin-2-yl]methylidene]-4lambda6-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate