(2R,3S,4aS,4bS,8aS)-2-(1-Hydroxymethyl-vinyl)-4b,8,8-trimethyl-2,3,4,4a,4b,5,6,7,8,8a,9,10-dodecahydro-phenanthrene-2,3-diol                                                                                                                                                              在
                                                                                                                                                                                 
manganese(IV) oxide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
氯仿                                                                                  为溶剂,
                                                                                                                                                    反应 20.0h,
                                                                                                                以79%的产率得到(4aS,7aR,10aS,11aS,11bS)-4,4,11b-Trimethyl-8-methylene-2,3,4,4a,5,6,8,9,10a,11,11a,11b-dodecahydro-1H-10-oxa-cyclopenta[b]phenanthrene-7a,9-diol