Photocatalytic Benzylic C–H Oxidation/Cyclization of Enaminones to the Synthesis of Polysubstituted Oxazoles
作者:Mingrui Li、Zhiqin He、Wei Zhao、Yang Yu、Fei Huang、Jonathan B. Baell
DOI:10.1021/acs.joc.3c00269
日期:2023.7.7
benzylic C–H oxidation/cyclization of enaminones was efficiently achieved to afford oxazole derivatives under mild conditions. The oxygen in the oxazole ring originated from green oxidant molecular oxygen. The synthetic protocol features broad substrate scopes and good functional group tolerance. The combined experimental and theoretical studies reveal that in suit benzylic C–H oxidation/cyclization is involved
An oxidative free-radical C(sp2)–H bond chlorination strategy of enaminones has been developed by using LiCl as a chlorinating reagent and K2S2O8 as an oxidant. This transformation provides a new and straightforward synthetic methodology to afford highly functionalized α-chlorinated enaminones with a Z-configuration in good to excellent yields.
以LiCl为氯化剂、K 2 S 2 O 8为氧化剂,开发了烯胺酮的氧化自由基C(sp 2 )–H键氯化策略。这种转化提供了一种新的、简单的合成方法,以良好至优异的产率提供具有Z构型的高度官能化的 α-氯化烯胺。