Catalytic Photoredox C–H Arylation of 4-Oxo-4<i>H</i>-pyrido[1,2-<i>a</i>]pyrimidine-3-diazonium Tetrafluoroborates and Related Heteroaryl Diazonium Salts
作者:Kris Antolinc、Helena Brodnik、Uroš Grošelj、Bogdan Štefane、Nejc Petek、Jurij Svete
DOI:10.1021/acs.joc.3c01517
日期:2023.10.6
presence of eosin Y disodium salt (EY-Na2) as a photocatalyst furnished the corresponding arylation products in 8–63% yields. The proposed photocatalytic cycle is analogous to that proposed previously for closely related photoredox C–H arylations with aryl diazonium salts as aryl radical sources. This method has a broad substrate scope and represents a metal-free alternative for the synthesis of 3-heteroaryl-substituted
在曙红 Y 二钠盐 ( EY-Na 2 ) 作为光催化剂的情况下,用绿光 (510 nm) 照射标题重氮盐和杂芳烃的混合物,得到相应的芳基化产物,产率为 8-63%。所提出的光催化循环类似于之前提出的以芳基重氮盐作为芳基自由基源的密切相关的光氧化还原C-H芳基化反应。该方法具有广泛的底物范围,是合成具有桥头氮原子的 3-杂芳基取代的 4 H-喹嗪-4-酮以及叠氮基和偶氮基稠合嘧啶酮的无金属替代方案。