(3aS,4aR,5aS,9aR,10aR,11aS)-tetradecahydro-11a-methyl-1H-cyclopenta[b]anthracene-1,7(4H)-dione                                                                                                                                                              在
                                                                                                                                                                                 
potassium tri-sec-butyl-borohydride                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 1.5h,
                                                                                                                以82%的产率得到(3aS,4aR,5aS,7R,9aR,10aR,11aS)-7-hydroxy-11a-methyl-3,3a,4,4a,5,5a,6,7,8,9,9a,10,10a,11-tetradecahydro-2H-cyclopenta[b]anthracen-1-one