(20R,22R)-1α,3β,20-trihydroxy-witha-5,24-dienolide                                                                                                                                                              在
                                                                                                                                                                                 lithium aluminium tetrahydride                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 4.0h,
                                                                                                                以50%的产率得到(Z)-(5R,6R)-6-((1S,3R,8S,9S,10R,13S,14S,17S)-1,3-Dihydroxy-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)-2,3-dimethyl-hept-2-ene-1,5,6-triol