Gold-Catalyzed Ascorbic Acid-Induced Arylative Carbocyclization of Alkynes with Aryldiazonium Tetrafluoroborates
作者:Ignacio Medina-Mercado、Abraham Colin-Molina、José Enrique Barquera-Lozada、Braulio Rodríguez-Molina、Susana Porcel
DOI:10.1021/acscatal.1c01826
日期:2021.8.6
describe, herein, arylative carbocyclization of alkynes catalyzed by gold. In this process, Au(I) is oxidized to Au(III) with aryldiazonium tetrafluoroborates following a photosensitizer-free and irradiation-free protocol. Ascorbic acid acts as a radical initiator, generating aryl radicals. According to DFT calculations, these radicals are added to Au(I), leading to a Au(II) species that is further oxidized
我们在本文中描述了由金催化的炔烃的芳基碳环化。在这个过程中,按照无光敏剂和无辐射的协议,Au(I) 被四氟硼酸芳基重氮氧化为 Au(III)。抗坏血酸作为自由基引发剂,产生芳基自由基。根据 DFT 计算,这些自由基被添加到 Au(I) 中,导致 Au(II) 物种在四氟硼酸盐阴离子的帮助下进一步氧化为 Au(III)。整个芳基碳环化过程在能量上非常有利,以完全区域和立体选择性的方式将芳炔基醚转化为有价值的 3,4-二芳基-2 H-色烯。此外,我们表明合成的 3,4-二芳基-2 H-色烯表现出多态性,其晶体的颜色存在显着差异,这一特性可能会导致未来有色衍生物的开发。