Controlled Photochemical Synthesis of Substituted Isoquinoline-1,3,4(2<i>H</i>)-triones, 3-Hydroxyisoindolin-1-ones, and Phthalimides via Amidyl Radical Cyclization Cascade
作者:Mandapati Bhargava Reddy、Kesavan Prasanth、Ramasamy Anandhan
DOI:10.1021/acs.orglett.2c01296
日期:2022.5.27
We report a controlled radical cyclization cascade of isoquinoline-1,3,4(2H)-triones, 3-hydroxyisoindolin-1-ones, and phthalimides from o-alkynylated benzamides by metal-free photoredox catalyzed amidyl N-centered radical addition to the C–C triple bond using the proton-coupled electron transfer (PCET) process under mild reaction conditions. A time tunable synthesis of 3-hydroxyisoindolin-1-ones and
我们报告了异喹啉-1,3,4( 2H )-三酮、3-羟基异吲哚啉-1-酮和邻苯二甲酰亚胺的可控自由基环化级联反应,通过无金属光氧化还原催化的酰胺基 N 中心自由基加成在温和的反应条件下,使用质子耦合电子转移 (PCET) 过程形成 C-C 三键。在可见光照射下,还实现了通过 β-羰基-C(sp 3 ) 键断裂合成 3-羟基异吲哚啉-1-酮和邻苯二甲酰亚胺的时间可调合成。各种控制和淬火实验以及 EPR 研究支持自由基环化级联的机械原理。