methyl (4S,4aR,4bS,8aS,10aR)-4-acetyloxy-4b,8,8,10a-tetramethyl-1-oxo-4,4a,5,6,7,8a,9,10-octahydrophenanthrene-2-carboxylate                                                                                                                                                                                              以
                                                                                         
吡啶                                                                                  为溶剂,
                                                                                                                                                    反应 48.0h,
                                                                                                                生成                                                 methyl (3R,4R,4aR,4bS,8aS,10aR)-1,4-diacetyloxy-3-methoxy-4b,8,8,10a-tetramethyl-4,4a,5,6,7,8a,9,10-octahydro-3H-phenanthrene-2-carboxylate