Asymmetric Synthesis of Spirooxindoles via Nucleophilic Epoxidation Promoted by Bifunctional Organocatalysts
作者:Martina Miceli、Andrea Mazziotta、Chiara Palumbo、Elia Roma、Eleonora Tosi、Giovanna Longhi、Sergio Abbate、Paolo Lupattelli、Giuseppe Mazzeo、Tecla Gasperi
DOI:10.3390/molecules23020438
日期:——
catalysts displaying various effects that noticeably differ in terms of steric hindrance and electron demand; (ii) employed α-alkylidene oxindoles decorated with different substituents on the aromatic ring (11a–g), the exocylic double bond (11h–l), and the amide moiety (11m–v). The observed results suggest that the modification of the electron-withdrawing group (EWG) weakly conditions the overall outcomes
考虑到我们实验室开发的缺电子烯烃有机催化环氧化反应的假设反应机理,我们研究了能够对安装在底物/催化剂/氧化剂内部的 H 键网络产生积极影响的关键因素。为了这个目标,我们已经: (i) 测试了一些催化剂,显示出在空间位阻和电子需求方面明显不同的各种效果;(ii) 使用在芳环 (11a-g)、环外双键 (11h-l) 和酰胺部分 (11m-v) 上装饰有不同取代基的 α-亚烷基羟吲哚。观察到的结果表明,吸电子基团 (EWG) 的修饰对整体结果的影响很小,相反,强烈的影响明确归因于 N 保护或 N 未保护的内酰胺框架。