Toluene-4-sulfonic acid (1S,2S,4aS,7S,10aR)-2-hydroxy-1,4a,7-trimethyl-7-vinyl-1,2,3,4,4a,5,6,7,8,9,10,10a-dodecahydro-phenanthren-1-ylmethyl ester 在
chromium(VI) oxide 、 lithium aluminium tetrahydride 、
硫酸 作用下,
以
四氢呋喃 为溶剂,
生成
(4aS,7S,10aR)-1,1,4a,7-Tetramethyl-7-vinyl-3,4,4a,5,6,7,8,9,10,10a-decahydro-1H-phenanthren-2-one