1α,3β-bis(tert-butyldimethylsilyloxy)-20(R)-hydroxypregna-5,7,16-triene 、
sodium;hydride 、
15-冠醚-5 、 (Z)-1-bromo-4-methyl-4-triethylsilyloxy-2-pentene 在
正己烷 、
乙酸乙酯 作用下,
以
四氢呋喃 为溶剂,
以ethyl acetate=30:1, developed once) to give the title compound as a colorless oil (70.3 mg, 85%)的产率得到1α,3β-bis(tert-butyldimethylsilyloxy)-20(R)-{(Z)-(4-methyl-4-triethyl-silyloxy-2-pentenyloxy)}pregna-5,7,16-triene