Trace amount Cu (ppm)-catalyzed intramolecular cyclization of 2-(gem-dibromovinyl)phenols(thiophenols) to 2-bromobenzofurans(thiophenes)
作者:Yong Ji、Pinhua Li、Xiuli Zhang、Lei Wang
DOI:10.1039/c3ob40531a
日期:——
An intramolecular cyclization of 2-(gem-dibromovinyl)phenols(thiophenols) to give 2-bromobenzofurans(thiophenes) in the presence of a trace amount of Cu (0.0064 mol%, 25 ppm) has been developed. The reaction provides the desired products in excellent yields under fluoride-free and mild reaction conditions and with a TON (turnover number) of up to 1.5 × 104.
在痕量铜(0.0064 mol%,25 ppm)存在下,开发了一种 2-(gem-dibromovinyl)苯酚(噻吩酚)分子内环化生成 2-溴苯并呋喃(噻吩)的方法。在无氟和温和的反应条件下,该反应能以极高的产率提供所需的产物,其 TON(转化率)高达 1.5 × 104。