K<sub>2</sub>CO<sub>3</sub>-Catalyzed Dual C–C-Coupled Cyclization to 3-Amino-4-benzoylbiphenyls and In Situ I<sub>2</sub>-Catalyzed C–N Bond Forming Annulation: A Metal-Free Synthesis of Arylacridones
作者:Aranya Das、Sudipto Debnath、Poulami Hota、Tuluma Das、Dilip K. Maiti
DOI:10.1021/acs.joc.3c01010
日期:2023.9.15
cyclization catalysis reactions are developed in a highly regioselective fashion to synthesize 3-amino-4-benzoyl biphenyls and arylacridones with high atom economy. Catalytic K2CO3 is utilized as the only reagent for the unusual rapid dual C–C-coupled cyclization between β-keto enamines and cinnamaldehydes to furnish the functionalized biphenyls. Its C(sp2)–H functionalized C–N bond-forming cyclization was
以高度区域选择性的方式开发了前所未有的无金属环化催化反应,以合成具有高原子经济性的3-氨基-4-苯甲酰联苯和芳基吖啶酮。催化 K 2 CO 3被用作 β-酮烯胺和肉桂醛之间异常快速的双 C-C 偶联环化的唯一试剂,以提供官能化联苯。使用分子 I 2作为催化剂,其 C(sp 2 )–H 官能化 C–N 键形成环化反应原位进行,以提供有价值的芳基吖啶酮。通过进行各种对照实验和 ESI-MS 分析,预测了新环化反应的合理机制。
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