甲醇 、
euphorianin 在
硫酸 作用下,
反应 1.0h,
以70%的产率得到(1R,1aS,2S,3S,4aS,6S,7S,7aS,10S,11R,11aR,E)-14-ethyl-1,1a,3,6,9,11a-hexamethyl-10-(3-methyl-2-methylenepentyl)-7,11-bis(2-methylallyl)-4-methylene-1,1a,2,3,4,6,7,10,11,11a-decahydro-5H-1,2-ethano-4a,7a-methanocyclopenta[a]cyclopropa[f][11]annulene