(S)-2-[(2S,5R,2'R,3'S,5'R)-5'-((7S,8S,10R)-8,10-Dimethyl-1,4,6-trioxa-spiro[4.5]dec-7-yl)-2-ethyl-3'-methyl-octahydro-[2,2']bifuranyl-5-yl]-5-methyl-hexane-2,5-diol 在
dipyridine chromium trioxide 作用下,
以
二氯甲烷 为溶剂,
反应 10.0h,
以74%的产率得到(2S,2'R,3'S,5'R)-5'-((7S,8S,10R)-8,10-Dimethyl-1,4,6-trioxa-spiro[4.5]dec-7-yl)-2-ethyl-3'-methyl-tetrahydro-[2,2']bifuranyl-5-one