4-nitrobenzyl 2-{4(R)-[benzthiazol-2-yldithio]-3(S)-[1(R)-hydroxyethyl]-2-oxoazetidin-1-yl}-3-methylbut-2-enoate 、
4-硝基苄基三苯基溴蓊盐 、
苯基锂 生成 {(3(S)- [1(R)-Hydroxyethyl] -1-[ (4-nitrobenzyl)oxycarbonyl-2-methylprop-1-enyl] -2-azetidinon-4(R)-ylthio}-(4-nitrophenyl)-methyltriphenylphosphonium trifluoroacetate 、 {3(S)-[1(R)hydroxyethyl]-1-[(4-nitrobenzyl)oxycarbonyl-2-methylprop-1-enyl]-2-azetidinon-4(R)-ylthio}-(4-nitrophenyl)-methylenetriphenylphosphorane