(8R)-8-[(1S)-1-[(3S,9S,10R,13R,14R,17R)-3-hydroxy-10,13-dimethyl-2,3,4,9,11,12,14,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-17-yl]ethyl]-5,5-dimethyl-2-phenyl-8H-[1,2,4]triazolo[1,2-a]pyridazine-1,3-dione 在
lithium aluminium tetrahydride 作用下,
以
四氢呋喃 为溶剂,
反应 3.0h,
以72.3%的产率得到cholesta-5,7,22,24-tetraen-3β-ol