FeCl<sub>3</sub>-Catalyzed Decyanative [4 + 2] Annulation of α-Aminonitriles with Alkynes: Access to 2,4-Diaryl Quinolines in Batch and Continuous-Flow Processes
作者:Swetha Sathyendran、Kesavan Muthu、Karthick Govindan、Nian-Qi Chen、Wei-Yu Lin、Gopal Chandru Senadi
DOI:10.1021/acs.orglett.3c01306
日期:2023.6.9
FeCl3-catalyzed decyanation of α-aminonitriles followed by a [4 + 2] annulation with terminal alkynes has been developed to synthesize 2,4-diaryl quinolines. A broad range of aniline, aldehyde, and arylacetylene derivatives were well tolerated to access 2,4-diaryl quinolines in moderate to good yields. The control experiment studies suggested that the reaction proceeds through a nonradical pathway
已开发出FeCl 3催化的 α-氨基腈脱氰反应,然后与末端炔烃进行 [4 + 2] 环化,以合成 2,4-二芳基喹啉。广泛的苯胺、醛和芳基乙炔衍生物具有良好的耐受性,能够以中等到良好的收率获得 2,4-二芳基喹啉。对照实验研究表明,反应通过非自由基途径进行,涉及从原位生成的亚铵物种的 Povarov 型 [4 + 2] 环化。该策略的合成应用 (i) 包括克级合成和 (ii) 在较短的反应时间(22 分钟)内对一些代表性化合物进行连续流动过程,以及 (iii) 作为概念证明与苯乙烯一起使用效果很好.