(2R,3S)-3-Benzenesulfonyl-2-((3aR,5aS,6S,10R,10aR)-10-methoxy-3a,5a-dimethyl-hexadecahydro-cyclopenta[a]cyclopropa[2,3]cyclopenta[1,2-f]naphthalen-6-yl)-2-methyl-oxirane 在
potassium tert-butylate 、
水 作用下,
以
四氢呋喃 为溶剂,
以95%的产率得到(R)-2-((3S,10R,13S,17S)-3-Chloro-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-hydroxy-propionaldehyde