(4E)-(1R,3R,5R)-1-acetoxy-3-[(tert-butyldimethylsilyl)oxy]-6-oxa-4-[3'-(p-toluenesulfonyloxy)propylidene]bicyclo[3.2.1]octan-7-one                                                                                                                                                              在
                                                                                                                                                                                 sodium tetrahydroborate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                    反应 38.0h,
                                                                                                                以79%的产率得到(5R,7R,8aR)-5-[(tert-butyldimethylsilyl)oxy]-7-hydroxymethyl-3,5,6,7,8,8a-hexahydro-2H-chromen-7-ol