3-(甲氧基甲氧基)环戊-2-烯-1-酮 、
(E)-3-[(4S,5S)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-2,2-dimethyl-[1,3]dioxolan-4-yl]-2-methyl-acrylic acid ethyl ester 在
lithium diisopropyl amide 作用下,
以
四氢呋喃 为溶剂,
生成 (1S,2R,3S,4R)-3-[(4S,5S)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-2,2-dimethyl-[1,3]dioxolan-4-yl]-1-methoxymethoxy-2-methyl-5-oxo-bicyclo[2.2.1]heptane-2-carboxylic acid ethyl ester 、 (1R,2S,3R,4S)-3-[(4S,5S)-5-(tert-Butyl-diphenyl-silanyloxymethyl)-2,2-dimethyl-[1,3]dioxolan-4-yl]-1-methoxymethoxy-2-methyl-5-oxo-bicyclo[2.2.1]heptane-2-carboxylic acid ethyl ester