(3S,5R,8S,9R,10R,13R,14R,17R)-17-((2R,5R,E)-5,6-dimethylhept-3-en-2-yl)-7-formyl-10,13-dimethyl-1,3,4,9,10,11,12,13,14,15,16,17-dodecahydro-2H-5,8-ethenocyclopenta[a]phenanthren-3-yl acetate 在
PTA 作用下,
以
甲苯 为溶剂,
生成
(1'R,4'S,5R,6R,13S)-13-Hydroxy-6,10-dimethyl-5-<1,4,5-trimethyl-(2E)-2-hexenyl>tetracyclo<13.2.2.02.6>nonadeca-1(17),9,15,18-tetraen-17-carbaldehyd-dimethylacetal