1-ethyl-1-methylpropyl acrylate 、 1α,3β-bis(tert-butyldimethylsilyloxy)-20(S)-hydroxy-9,10-secopregna-5,7,10(19),16-tetraene 以
四氢呋喃 为溶剂,
生成 1α,3β-bis(tert-butyldimethylsilyloxy)-20(S)-{2-(1-ethyl-1-methylpropoxycarbonyl)ethoxy}-9,10-secopregna-5,7,10(19),16-tetraene