3-(methoxymethyloxy)-7-oxa-cholest-8(9)-en-6-one                                                                                                                                                              在
                                                                                                                                                                                 
4-甲基苯磺酸吡啶                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
叔丁醇                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以85%的产率得到(1R,3aS,5aS,7S,9aS,11aR)-7-hydroxy-9a,11a-dimethyl-1-[(R)-6-methylheptan-2-yl]-1,2,3,3a,5a,6,7,8,9,9a,11,11a-dodecahydrobenzo[c]cyclopenta[h]chromen-5(10H)-one