(5S,6S,8R,9R)-4-Benzyloxy-6-[1-(tert-butyl-dimethyl-silanyloxy)-allyl]-3-hydroxy-9-methyl-2-oxo-1-oxa-spiro[4.5]dec-3-ene-8-carboxylic acid methyl ester 在
吡啶 、
sodium ethanolate 作用下,
以
二氯甲烷 为溶剂,
反应 5.0h,
生成
ethyl 4-benzyloxy-c-<1'-(tert-butyldimethylsilyloxy)allyl>-c-9-methyl-2-oxo-3-pivaloyloxy-(r-5)-1-oxaspiro<4.5>dec-3-ene-t-8-carboxylate