benzyl N-[3-[tert-butyl(dimethyl)silyl]oxy-1-(4,4-dimethoxycyclohexen-1-yl)propoxy]carbonylcarbamate 在
lithium tetra(tert-butoxo)aluminate 、
碘 作用下,
以
四氢呋喃 为溶剂,
生成 (4S,5S,6R)-4-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-6-iodo-8,8-dimethoxy-2-oxo-3-oxa-1-aza-spiro[4.5]decane-1-carboxylic acid benzyl ester 、 (4R,5S,6R)-4-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-6-iodo-8,8-dimethoxy-2-oxo-3-oxa-1-aza-spiro[4.5]decane-1-carboxylic acid benzyl ester