(20S)-3β-acetoxybisnorchol-5-en-22-al 、 titanium(IV)isopropoxide 、
1-Isopropoxy-1-(trimethylsiloxy)cyclopropane 生成
isopropyl (3β,22R)-3-acetoxy-22-hydroxy-26,27-bis(norcholest-5-en-25-oate) 、 isopropyl (3β,22R)-3-acetoxy-22-hydroxy-26,27-bis(norcholest-5-en-25-oate)