(3S,4S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-(1-hydroxy-1-methyl-3-trimethylsilanyl-prop-2-ynyl)-1-(4-methoxy-phenyl)-azetidin-2-one 在
potassium cyanide 、
silver nitrate 作用下,
生成
(2S,5S,6S)-6-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-2,4-dimethyl-1-aza-bicyclo[3.2.0]hept-3-en-7-one