Synthesis of 3-Acylindoles by Visible-Light Induced Intramolecular Oxidative Cyclization of <i>o</i>-Alkynylated <i><i>N,N</i></i>-Dialkylamines
作者:Ping Zhang、Tiebo Xiao、Shengwei Xiong、Xichang Dong、Lei Zhou
DOI:10.1021/ol501276j
日期:2014.6.20
A visible-light photoredox synthesis of 3-acylindoles through intramolecular oxidative cyclization of o-alkynylated N,N-dialkylamines is developed. The reaction proceeds effectively under mild reaction conditions using air as the oxidant, and only water is generated as a side product. A plausible mechanism involving the addition of α-amino alkyl radicals to alkynes, followed by C–O bond formation,
通过邻-炔基化的N,N-二烷基胺的分子内氧化环化,开发了3-酰基环戊二烯的可见光光氧化还原合成。使用空气作为氧化剂,在温和的反应条件下,反应可以有效地进行,并且仅生成水作为副产物。提出了一个可行的机制,包括向炔烃中添加α-氨基烷基自由基,然后形成C–O键。