草酰氯单烯丙酯 、 (3S,4S)-3-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-4-(2-oxo-tetrahydro-thiopyran-3-yl)-azetidin-2-one 在
TEA 、
potassium carbonate 、
亚磷酸三乙酯 作用下,
生成
(2S,2aS,2bS)-2-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-1-oxo-2,2a,2b,3,4,5-hexahydro-1H-6-thia-7a-aza-cyclobuta[a]indene-7-carboxylic acid allyl ester 、 (2S,2aS,2bR)-2-[(R)-1-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-1-oxo-2,2a,2b,3,4,5-hexahydro-1H-6-thia-7a-aza-cyclobuta[a]indene-7-carboxylic acid allyl ester