Synthesis of 1-Aryltetralins and 1-Arylnaphthalenes via (4 + 2) Annulation of β-Ketosulfones with Styryl Bromides
作者:Meng-Yang Chang、Yu-Chieh Cheng
DOI:10.1021/acs.orglett.6b00603
日期:2016.4.1
A novel route has been developed for the synthesis of various substituted 1-aryltetralins 6 and 1-arylnaphthalenes 8 via (1) K2CO3-mediated α-styrylation of β-ketosulfones 3 with bromostyryl bromides 4 and (2) stereocontrolled NaBH4-promoted reduction of the resulting γ-alkenones 5, followed by BF3·OEt2-catalyzed intramolecular annulation of the corresponding γ-alkenols 7 under rt/5 h and reflux/10
通过(1)K 2 CO 3介导的β-酮砜3的α-苯乙烯化与溴代苯乙烯基溴化物4和(2)立体控制的NaBH 4的合成,已开发出一种新的途径来合成各种取代的1-芳基四氢萘6和1-芳基萘8促进的所得γ-烯酮5还原,然后分别在rt / 5 h和回流/ 10 h条件下进行BF 3 ·OEt 2催化的相应γ-烯醇7的分子内环化反应。6和8的关键结构通过X射线晶体学分析证实。已经提出了一种合理的机制。