(3S,8S,9S,10R,13R,14S,17R)-3-[(E)-2-(benzenesulfonyl)ethenoxy]-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthrene 在
sodium amalgam 作用下,
以
甲醇 、 phosphate buffer 为溶剂,
以89%的产率得到3β-Vinyloxy-Δ
5-cholestene