Metal-Free Regioselective Alkylation of Imidazo[1,2-a]pyridines with N-Hydroxyphthalimide Esters under Organic Photoredox Catalysis
作者:Can Jin、Bin Sun、Tengwei Xu、Liang Zhang、Rui Zhu、Jin Yang、Min Xu
DOI:10.1055/s-0039-1691567
日期:2020.3
A visible-light-induced direct C–H alkylation of imidazo[1,2-a]pyridines has been developed. It proceeds at room temperature by employing inexpensive Eosin Y as a photocatalyst and alkyl N-hydroxyphthalimide (NHP) esters as alkylation reagents. A variety of NHP esters derived from aliphatic carboxylic acids (primary, secondary, and tertiary) were tolerated in this protocol, giving the corresponding
已开发出可见光诱导的咪唑并 [1,2-a] 吡啶直接 C-H 烷基化。它通过使用廉价的曙红 Y 作为光催化剂和烷基 N-羟基邻苯二甲酰亚胺 (NHP) 酯作为烷基化试剂在室温下进行。该协议允许使用源自脂肪族羧酸(初级、二级和三级)的各种 NHP 酯,从而以中等至极好的收率提供相应的 C-5 烷基化产品。机理研究表明,该过程涉及自由基脱羧偶联途径。