(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