(5S)-(2,2-Dichlorovinyl)-2,2,5,5-tetramethyl-1,3-dioxolane 、
3β-t-butyldimethylsilyloxy-pregn-5-en-20-one 生成 (2S)-2-[(3S,8S,9S,10R,13S,14S,17S)-3-[tert-butyl(dimethyl)silyl]oxy-10,13-dimethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl]-4-[(4S)-2,2,5,5-tetramethyl-1,3-dioxolan-4-yl]but-3-yn-2-ol