Synthesis of (±)-Nanaimoal and (±)-Nanaimool from<i>N,N</i>-Diethylgeranylamine
作者:Takashi Yamada、Kunihiko Takabe
DOI:10.1246/cl.1993.29
日期:1993.1
(±)-Nanaimoal and (±)-nanaimool were synthesized via Diels-Alder Reaction of 1,1-dimethyl-2,3-dimethylenecyclohexane, a novel building block for cyclic terpenoids, easily prepared from N,N-diethylgeranylamine.
Compared with the analogous reaction performed over a ZnCl2 catalyst in the conventional solvent dichloromethane, higher regioselectivity of the ‘para’ cycloadduct and excellent yield were achieved at shorter reaction time in these ionicliquids with optimized molar compositions of MX and ZnCl2. These moisture-insensitive ionicliquids can be easily separated from reaction products after simple washing