Synthesis of 2,4,5-Trisubstituted Oxazoles from Copper-Mediated Benzylic sp<sup>3</sup> C–H Aerobic Oxidative Annulation of Ketones and Amines via a Cascade Reaction
作者:Mncedisi Mazibuko、Vineet Jeena
DOI:10.1021/acs.joc.2c02148
日期:2023.1.20
potent organic compounds. A facile synthesis of 2,4,5-trisubstituted oxazoles through an oxidative, copper-catalyzed, and solvent-free annulation is described. Various arylated oxazoles were efficaciously synthesized at a mild temperature from readily available substrates under a molecular oxygen atmosphere. Preliminary mechanistic studies suggested that the reaction proceeds via an anionic-type mechanism
sp 3碳的功能化被认为在合成有机化学中具有挑战性,但在生产有效有机化合物方面具有巨大潜力。描述了通过氧化、铜催化和无溶剂环化轻松合成 2,4,5-三取代恶唑。在温和的温度下,在分子氧气氛下,从容易获得的底物有效地合成了各种芳基化的恶唑。初步的机理研究表明,反应通过阴离子型机制进行,并表明形成了酮-亚胺中间体。该反应以六个氢原子的提取、一个 sp 2碳和两个 sp 3碳的官能化以及 C–O 和 C–N 键的形成而著称。