Visible‐Light‐Mediated Cycloaddition of Azobenzenes and Nonstabilized Azomethine Ylides to Access 1,2,4‐Triazolidines
作者:Jingya Yang、Wentong Ma、Shengyu Wang、Jiangjiang Li、Hongyan Zhou
DOI:10.1002/adsc.202300707
日期:2023.12.5
A visible-light-mediated cycloaddition of azobenzenes and nonstabilized azomethine ylides has been developed to access 1,2,4-triazolidines. With readily available organic dye rose bengal as a photocatalyst and alkyl tertiary amines as precursors for azomethine ylides, the reaction proceeded smoothly under visible light irradiation at room temperature, affording various 4-alkyl-1,2-diaryl-1,2,4-triazolidines
偶氮苯和不稳定的偶氮甲碱叶立德通过可见光介导的环加成反应可得到 1,2,4-三唑烷。以易得的有机染料玫瑰红为光催化剂,以烷基叔胺为偶氮甲碱叶立德的前体,反应在室温可见光照射下顺利进行,得到各种4-烷基-1,2-二芳基-1,2,4-三唑烷,收率高达96%。初步机理研究表明,不稳定的偶氮甲碱叶立德是通过光氧化还原催化原位形成的。