(1R,2S,10S,13S,14R,17S)-17-hydroxy-10,14-dimethyl-5-(4-methylphenyl)-7-oxo-6-oxapentacyclo[11.8.0.02,10.04,9.014,19]henicosa-4,8,19-triene-8-carbonitrile 在
环己酮 、 aluminum isopropoxide 作用下,
以
苯 为溶剂,
反应 16.0h,
以65%的产率得到(1R,2S,10S,13S,14R)-10,14-dimethyl-5-(4-methylphenyl)-7,17-dioxo-6-oxapentacyclo[11.8.0.02,10.04,9.014,19]henicosa-4,8,18-triene-8-carbonitrile