Facile Approach for the Synthesis of 2,3,4,9-Tetrahydro-1<i>H</i>-xanthen-1-ones and 8,9,10,12-Tetrahydro-11<i>H</i>-benzo[<i>a</i>]xanthen-11-ones via Trapping of <i>o</i>-Quinone Methides
作者:Vitaly A. Osyanin、Elena A. Ivleva、Yuri N. Klimochkin
DOI:10.1080/00397911.2010.545164
日期:2012.6.15
Abstract An efficient, simple synthesis of 2,3,4,9-tetrahydro-1H-xanthene-1-ones and 8,9,10,12-tetrahydro-11H-benzo[a]xanthen-11-ones is reported by one-pot condensation of 3-dimethylamino-2-cyclohexen-1-ones with hydroxybenzyl alcohols, phenol, and 2-naphthol Mannich bases or their quaternized derivatives. The mechanism of the reaction is believed to involve the formation of the o-quinone methide
摘要 2,3,4,9-四氢-1H-xanthene-1-ones 和 8,9,10,12-四氢-11H-benzo[a]xanthene-11-ones 的一种高效、简单的合成方法报道了- 3-二甲氨基-2-环己烯-1-酮与羟基苄醇、苯酚和2-萘酚曼尼希碱或其季铵化衍生物的锅缩合。据信该反应的机理涉及邻醌甲基化物中间体的形成。图形概要