Cycloaddition of Acyclic Conjugated Dienes with a Tetrachloro-Substituted Oxyallyl Intermediate Generated from Pentachloroacetone
作者:Baldur Föhlisch、Hilmar Korfant、Holger Meining、Wolfgang Frey
DOI:10.1002/1099-0690(200004)2000:7<1335::aid-ejoc1335>3.0.co;2-2
日期:2000.4
Pentachloroacetone (1) reacts with several conjugated dienes in the presence of sodium trifluoroethoxide/trifluoroethanol to form cycloadducts of a tetrachlorooxyallyl intermediate 6, mainly in the [4+3] mode. Representative [4+3] cycloadducts, i.e. α,α,α′,α′-tetrachlorocycloheptenones 9, have been dehalogenated and dehydrohalogenated, furnishing α,α′-dichlorotropones 15 in high yields.
五氯丙酮 (1) 在三氟乙醇钠/三氟乙醇的存在下与几种共轭二烯反应,形成四氯氧基烯丙基中间体 6 的环加合物,主要以 [4+3] 模式进行。代表性的 [4+3] 环加合物,即 α,α,α',α'-四氯环庚烯酮 9,已被脱卤和脱卤化氢,以高产率提供 α,α'-二氯托酮 15。