磷酰基乙酸三乙酯 、 (3S,5R,9R,10S,13R)-3-Hydroxy-13-methyl-2,3,4,5,6,7,9,10,11,12,13,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthrene-17-carbaldehyde 在
potassium tert-butylate 作用下,
以
四氢呋喃 为溶剂,
反应 0.17h,
以69%的产率得到(E)-3-((3S,5R,9R,10S,13R,17R)-3-Hydroxy-13-methyl-2,3,4,5,6,7,9,10,11,12,13,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)-acrylic acid ethyl ester