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。
Visible <scp>Light‐Induced</scp> [3+2] Annulation Reaction of Alkenes with Vinyl Azides: Direct Synthesis of Functionalized Pyrroles
作者:Ming Yang、Xin‐Yu Wang、Jie Wang、Yu‐Long Zhao
DOI:10.1002/cjoc.202300498
日期:2024.1.15
photocatalytic [3+2] annulation of alkenes with vinyl azides was developed under irradiation by visiblelight in the presence of organic dye photocatalysts. Broad substrate scope and high functional group tolerance were demonstrated by more than 50 examples. The reaction provides a novel and efficient method for the synthesis of polyfunctionalized pyrroles under very mild metal-free conditions without other