作者:S. Carlsson、S.-O. Lawesson
DOI:10.1016/0040-4020(80)88057-4
日期:1980.1
Enamines (1) derived from cyclohexanone or cyclopentanone are reacted with electrophilic olefins (ethyl acrylate, ethyl 2-methylacrylate, ethyl 2-butenoate) to give the new enamines, 2. When 2 is reacted with LiAlH4, reductive cyclisation takes place giving hexahydrochromane-8a-amines of octahydrocyclopentapyrane-7a-amines, 3, in quantitative yields. 3 is hydrolyzed with dilute aqueous hydrochloric
使衍生自环己酮或环戊酮的烯胺(1)与亲电烯烃(丙烯酸乙酯,2-甲基丙烯酸乙酯,2-丁烯酸乙酯)反应,得到新的烯胺2。当2与反应的LiAlH 4,还原环化需要octahydrocyclopentapyrane-7A-胺,代替给予hexahydrochromane基-8a-胺3,以定量的产率。3用稀盐酸水溶液水解成八氢环戊戊烷-7a-ols的六氢苯并烷-8a-ols(4),并在回流二恶烷中与草酸反应生成缩合的二氢吡喃,5。