Construction of Nitrated Benzo[3.3.1]bicyclic Acetal/Ketal Core via Nitration of <i>o</i>-Carbonyl Allylbenzenes
作者:Chieh-Kai Chan、Yu-Lin Tsai、Meng-Yang Chang
DOI:10.1021/acs.orglett.7b00245
日期:2017.3.17
Intramolecular annulation of o-carbonyl allylbenzenes was achieved to construct novel nitrated [6,6,6]tricycles having an acetal or ketal motif in good yields. The expeditious one-step nitration route provides 4 or 5 new bond formations, including 2 or 3 C–N bonds and 2 C–O bonds. The structural framework of benzobicycle [3.3.1] is confirmed by X-ray crystallographic analysis. A plausible mechanism
实现了邻羰基烯丙基苯的分子内环化反应,以高收率构建了具有缩醛或缩酮基序的新型硝化[6,6,6]三环。快速的一步硝化路线提供了4或5个新的键形成,包括2或3个C–N键和2个C–O键。X射线晶体学分析证实了苯并双环[3.3.1]的结构框架。提出了一个合理的机制。