(3S,5S)-3-triethylsiloxy-7-oxa-8-cholesten-6-one 、
3-溴丙烯 、
碘化钾 、 在
氧化银(II) 作用下,
以(3S,5S)-3-triethylsiloxy-5-allyl-7-oxa-8-cholesten-6-one (11.0 mg, 24%) were obtained in the same manner as Example 17的产率得到(3S,5S)-3-triethylsiloxy-5-allyl-7-oxa-8-cholesten-6-one