3-氯丙烯 、 (+/-)-7,7-ethanediyldioxy-4
t-ethoxycarbonyloxy-4b-methyl-1-oxo-(4a
r,4b
t,10a
t)-1,2,3,4,4a,4b,5,6,7,8,10,10a-dodecahydro-phenanthrene-2-carboxylic acid ethyl ester 在
potassium carbonate 、
丙酮 、 potassium iodide 作用下,
生成
rac-3,3-ethanediyldioxy-11β-ethoxycarbonyloxy-14,15-seco-13α-androsta-5,15-diene-14ξ,18-diol