(1ξ,3aR,4S,8aS)-1-chloro-2,3,3a,4,5,7,8,8a-octahydro-4-methoxy-8a-methyl-6(1H)-azulenone 6-ethylene acetal 在
potassium tert-butylate 作用下,
以
二甲基亚砜 为溶剂,
反应 14.0h,
以88%的产率得到(3aR,4S,8aS)-3a,4,5,7,8,8a-hexahydro-4-methoxy-8a-methyl-6(3H)-azulenone 6-ethylene acetal