Oxokohlenstoffe und verwandte Verbindungen; 21. Mitteilung.<sup>1</sup>Diels-Alder Reaktion von 3-Halogeno-3-cyclobuten-1,2-dionen mit 1,1′-Bi-1-cycloalkenylen: Synthese dicycloalkano-anellierter Dihydrobenzocyclobutendione und Benzocyclobutendione
作者:Arthur H. Schmidt、Christian Künz、Marianne Malmbak、Jörg Zylla
DOI:10.1055/s-1994-25490
日期:——
Oxocarbons and Related Compounds; Part 21.1 Diels-Alder Reactions of 3-Halogeno-3-cyclobutene-1,2-diones with 1,1′-Bi-1-cycloalkenyls. Synthesis of Dicycloalkano-annulated Dihydrobenzocyclobutenediones and Benzocyclobutenediones On controlled heating to 100°C, 3-chloro-3-cyclobutene-1,2-diones (5a) reacted with 1,1′-bi-1-cyclohexenyl (6) and 1, 1′-bi-1-cyclopentenyl (13) to give the dicycloalkano-annulated dihydrobenzocyclobutenediones 7 and 16, respectively. Treatment of carbon tetrachloride solutions of 7 and 16 with bromine at reflux temperature afforded the corresponding benzocyclobutenediones 9 and 17. Surprisingly, the reaction of 5a with 1,1′-bi-1-cycloheptenyl (14) and 1,1′-bi-1-cyclooctenyl (15) gave directly the benzocyclobutenediones 20 and 21. The hitherto unknown 3-bromo-3-cyclobutene-1,2-dione (5c) was prepared by treatment of 3-hydroxy-3-cyclobutene-1,2-dione (5b) with oxalic dibromide in 76% yield. Its reaction with the dienes 6, 13, 14 has been investigated.
氧碳化合物及相关化合物;第21.1部分 Diels-Alder反应的3-卤代-3-环丁烯-1,2-二酮与1,1'-双-1-环烷烯的反应。二环烷基并环二氢苯并环丁二烯二酮和苯并环丁二烯二酮的合成 在100°C下加热控制,3-氯-3-环丁烯-1,2-二酮(5a)与1,1'-双-1-环己烯(6)和1,1'-双-1-环戊烯(13)反应,分别得到二环烷基并环二氢苯并环丁二烯二酮7和16。将7和16的四氯化碳溶液在回流温度下与溴反应,分别得到相应的苯并环丁二烯二酮9和17。令人惊讶的是,5a与1,1'-双-1-环庚烯(14)和1,1'-双-1-环辛烯(15)的反应直接得到苯并环丁二烯二酮20和21。迄今未知的3-溴-3-环丁烯-1,2-二酮(5c)通过3-羟基-3-环丁烯-1,2-二酮(5b)与草酸二溴反应制备,产率为76%。其与二烯6、13、14的反应已进行了研究。