Palladium-Catalyzed Vinylation of Haloazulenes and Halotropolones with Olefins. Utility of the Heck Reaction in the Conjugated Carbon Chain Preparation
作者:Hiroshi Horino、Toyonobu Asao、Naoto Inoue
DOI:10.1246/bcsj.64.183
日期:1991.1
The reactions of 3-iodotropolone with styrenes (styrene, p-methoxystyrene, and 2-vinylpyridine), methyl acrylate, and allylic compounds (methyl 3-butenoate, 3-butenenitrile, 1-allyl-3,4-dimethoxybenzene, and 1-allyl-3,4-methylenedioxybenzene) were carried out, according to the modified Heck’s procedure, to give 3-styryl-, 3-(2-carboxyvinyl)-, and 3-(3-substituted 1-propenyl)tropolones, respectively. Similarly, 4-bromo- or 5-bromotropolone was made to react with these olefins to yield 4-styryltropolone or the corresponding 5-(2-substituted vinyl)- and 5-(3-substituted 1-propenyl)tropolones. Substitution of 2-chlorotropone by styrenes produced 2-styryltropones. Extension of the vinylation to 2-amino-6-bromoazulenes, ethyl 3-bromo-1-azulenecarboxylate, and diethyl 2-chloro-1,3-azulenedicarboxylate resulted in a similar substitution.
根据改进的 Heck 反应程序,3-碘苯并烯酮与苯乙烯(苯乙烯、对甲氧基苯乙烯和 2-乙烯基吡啶)、丙烯酸甲酯和烯丙基化合物(3-丁烯酸甲酯、3-丁烯腈、1-烯丙基-3,4-二甲氧基苯和 1-烯丙基-3,4-亚甲基二氧基苯)发生反应,得到 3-苯乙烯基、3-(2-羧基乙烯基)和 1-烯丙基-3,4-亚甲基二氧基苯、和 1-烯丙基-3,4-亚甲二氧基苯),分别得到 3-苯乙烯基、3-(2-羧基乙烯基)- 和 3-(3-取代的 1-丙烯基)- 叔戊酮。同样,4-溴-或 5-溴ropolone 也能与这些烯烃发生反应,生成 4-苯乙烯基-tropolone 或相应的 5-(2-取代乙烯基)- 和 5-(3-取代 1-丙烯基)-tropolone。苯乙烯取代 2-氯托丙酮生成 2-苯乙烯基托丙酮。将乙烯基化反应扩展到 2-氨基-6-溴偶氮苯、3-溴-1-偶氮苯甲酸乙酯和 2-氯-1,3-偶氮二甲酸二乙酯会产生类似的取代反应。