(E)-5-(tert-Butyl-dimethyl-silanyloxy)-2-methyl-pent-2-enoic acid methyl ester 、 (5R)-5-[[tert-butyl(diphenyl)silyl]oxymethyl]-3-(methoxymethoxy)cyclohex-2-en-1-one 在
lithium diisopropyl amide 作用下,
以
四氢呋喃 为溶剂,
以65%的产率得到(1S,2R,3S,4S,5R)-3-[2-(tert-Butyl-dimethyl-silanyloxy)-ethyl]-5-(tert-butyl-diphenyl-silanyloxymethyl)-1-methoxymethoxy-2-methyl-8-oxo-bicyclo[2.2.2]octane-2-carboxylic acid methyl ester