Direct alkenylation of alkylazaarenes with aldehydes through C(sp3)–H functionalization under catalytic InCl3 activation
作者:Zaini Jamal、Yong-Chua Teo、Gina Shiyun Lim
DOI:10.1016/j.tet.2016.03.004
日期:2016.4
Under the influence of InCl3 as a Lewis acid catalyst, a methodology on the C(sp3)–H functionalization of alkylazaarenes has been demonstrated through the activation of benzylic C–H bonds towards their addition reaction with the appropriate electrophiles. This methodology was chiefly applied in the direct alkenylation of primary and secondarybenzylic C–H bonds of alkylazaarenes with aldehydes. A variety
ligand-free MnO2 mediated sequentialoxidation and olefination has been developed for the facile synthesis of a broad range of unsaturated N-heteroazaarenes from simple alkyl-substituted heteroarenes and alcohols. The procedure tolerates a series of functional groups, such as methoxyl, chloro, bromo, iodo, vinyl, phenolic and hetero groups, providing the olefination products in moderate to good yields
Nickel-catalysed direct α-olefination of alkyl substituted N-heteroarenes with alcohols
作者:Jagadish Das、Mari Vellakkaran、Debasis Banerjee
DOI:10.1039/c9cc03591e
日期:——
dehydrogenative coupling is presented. A simple nickel catalyst system stabilised by readily available nitrogen ligands enables a series of interesting E-configured vinylarenes (confirmed by X-ray crystal-structureanalysis) to be synthesised in good to excellent yields with olefin/alkane selectivity of >20 : 1. Hydrogen and water are generated as byproducts and quantitative determination of H2 was performed
Iron/TEMPO-catalyzed direct aerobic oxidative coupling of methyl-mubstituted N-heteroazaarenes with alcohols
作者:Zhiguang Zhang、Yantao Ma、Siwei Dai、Ling Li、Yong Zhang、Hao Li
DOI:10.1016/j.tetlet.2020.151885
日期:2020.5
A novel direct oxidative coupling of methyl-substituted N-heteroazaarenes with alcohols has been developed to construct olefins under mild condition. The reaction is catalyzed by Fe(NO3)3·9H2O/TEMPO with oxygen as terminal oxidant. A variety of E-disubstituted olefins bearing diverse functional groups could be obtained selectively in moderate to excellent yields. The reaction is environmentally friendly
已经开发了甲基取代的N-杂氮杂芳烃与醇的新颖的直接氧化偶联,以在温和的条件下构建烯烃。Fe(NO 3)3 ·9H 2 O / TEMPO以氧为末端氧化剂催化反应。可以以中等至优异的产率选择性地获得各种带有不同官能团的E-二取代的烯烃。该反应对环境友好且不含配体。