4-(2-{(2R,3S)-1-Allyloxyoxalyl-3-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-4-oxo-azetidin-2-yl}-acetyl)-piperidine-1-carboxylic acid allyl ester 在
亚磷酸三乙酯 作用下,
以
甲苯 为溶剂,
生成
(5R,6S)-3-(1-Allyloxycarbonyl-piperidin-4-yl)-6-[(R)-1-(tert-butyl-dimethyl-silanyloxy)-ethyl]-7-oxo-1-aza-bicyclo[3.2.0]hept-2-ene-2-carboxylic acid allyl ester