1,4-Dien-3-ones substituted with pendant arylethyl side chains attached at C-1 were readily prepared from substituted dihydrocinnamaldehydes. Treatment with TiCl4 at low temperature effected domino Nazarov electrocyclization arene trapping within 5 min to give racemic benzohydrindenones in near-quantitative yield and with complete diastereoselectivity.Key words: domino process, electrophilic aromatic substitution, Lewis acid, Nazarov cyclization.
1,4-二烯-3-酮,其C-1位上连接有悬垂的芳基乙基侧链,可从取代的二氢肉桂醛中方便地制备。在低温下使用TiCl4处理,可在5分钟内实现多米诺Nazarov电环化-芳环捕捉反应,以近定量的产率和完全的非对映选择性得到外消旋苯并吲哚酮。关键词:多米诺过程,亲电芳香取代,路易斯酸,Nazarov环化。