(6aS,7aR,8aS,9aR)-3-Isopropyl-9a-methyl-7-methylene-5,6a,7,8a,9,9a-hexahydro-6H-8-oxa-cyclopropa[b]phenanthrene-7a-carboxylic acid methyl ester 在
三氟甲磺酸三甲基硅酯 作用下,
生成 (3bR,9bS,11R)-11-Hydroxy-7-isopropyl-9b-methyl-3b,4,5,9b,10,11-hexahydro-3H-phenanthro[1,2-c]furan-1-one