An Approach to the Selenobromination of Aryl(thienyl)alkynes: Access to 3-Bromobenzo[<i>b</i>]selenophenes and Selenophenothiophenes
作者:Edgars Paegle、Sergey Belyakov、Pavel Arsenyan
DOI:10.1002/ejoc.201402095
日期:2014.6
A novel approach for the cyclization of arylalkynes with selenium(IV) bromide prepared in situ has been elaborated. The use of an alkene additive as a bromine scavenger provides a convenient synthetic pathway for the synthesis of a wide variety of 3-bromobenzo[b]selenophenes. Reactions can be performed open to air without the use of moisture-sensitive reagents, anhydrous solvents, or an inert atmosphere
详细阐述了一种用原位制备的溴化硒 (IV) 环化芳炔的新方法。使用烯烃添加剂作为溴清除剂为合成各种 3-溴苯并 [b] 硒酚提供了方便的合成途径。反应可以在空气中进行,无需使用对湿气敏感的试剂、无水溶剂或惰性气氛。乙炔基噻吩的硒溴化作用已用于制备硒酚[3,2-b]-和硒酚[2,3-b]噻吩。代表性衍生物的分子结构已通过 X 射线晶体学分析得到证实。