Domino Three-Component <i>N</i>-Acylation/[4 + 2] Cycloaddition/Alder-ene Synthesis of Polysubstituted Benzo[<i>f</i>]isoindole-4-carboxylic Acids
作者:Kseniya A. Alekseeva、Maryana A. Nadirova、Vladimir P. Zaytsev、Evgeniya V. Nikitina、Mikhail S. Grigoriev、Anton P. Novikov、Irina A. Kolesnik、Bernhard Mayer、Thomas J. J. Müller、Fedor I. Zubkov
DOI:10.1021/acs.joc.3c01476
日期:2023.11.3
adjacent chiral centers and leading to a single diastereoisomer of the title compound. The efficiency of the transformation is secured by thermal conditions or utilization of soft Lewis acids (Yb(OTf)3) as catalysts. The kinetics and mechanism of the 3CR were studied by using dynamic 19F NMR. Based on the NMR data and density functional theory (DFT) calculations, the IMDAV, not the Alder-ene, reaction
以肉桂胺(3-芳基烯丙胺)、马来酰亚胺和马来酸酐为原料,通过新的三组分反应(3CR)合成了不同取代的部分饱和苯并[f]异吲哚-4-羧酸。该过程包括马来酸酐对胺的N-酰化、乙烯基芳烃的分子内 [4 + 2] 环加成(IMDAV 反应)以及 Diels-Alder 中间体和马来酰亚胺之间的 Alder-ene 反应。所有反应步骤均以高度区域和立体选择性的方式进行,提供五个相邻的手性中心并产生标题化合物的单一非对映异构体。通过热条件或使用软路易斯酸(Yb(OTf) 3 )作为催化剂来确保转化效率。通过动态19 F NMR研究了 3CR 的动力学和机理。根据 NMR 数据和密度泛函理论 (DFT) 计算,IMDAV(而非 Alder-ene)反应是整个过程的限速步骤。