Redox-Neutral Couplings between Amides and Alkynes via Cobalt(III)-Catalyzed C–H Activation
作者:Lingheng Kong、Songjie Yu、Xukai Zhou、Xingwei Li
DOI:10.1021/acs.orglett.5b03629
日期:2016.2.5
construction of heterocycles. This is ideally catalyzed by earth-abundant and eco-friendly transition metals. We report Co(III)-catalyzedredox-neutralcoupling between arenes and alkynes using an NH amide as an electrophilic directing group. The redox-neutral C–H activation/coupling afforded quinolines with water as the sole byproduct.
intermediate enables the switchable synthesis of quinoline and indole from amides and alkynes through C–H activation using Cp*Co(III). The keys to this strategy are (1) introducing a Lewis acid to greatly accelerate the dehydrative cyclization, which can outcompete dehydrogenative cyclization, and (2) tuning the directing group to facilitate the dehydrogenative cyclization and inhibit dehydrative cyclization
Domino Nitro Reduction-Friedländer Heterocyclization for the Preparation of Quinolines
作者:Kwabena Fobi、Richard A. Bunce
DOI:10.3390/molecules27134123
日期:——
presence of active methylene compounds (AMCs) to produce substituted quinolines in high yields. The conditions are mild enough to tolerate a wide range of functionality in both reacting partners and promote reactions not only with phenyl and benzyl ketones, but also with β-keto-esters, β-keto-nitriles, β-keto-sulfones and β-diketones. The reaction of 2-nitroaromatic ketones with unsymmetrical AMCs is
Spontaneously or under various heating conditions, 2-alkyl- or 2-aryl-(iminoalkyl)benzenamines react with ketones and triflic acid (1:1:1) to give quinolinium salts. When working under milder thermal conditions, intermediate 1,2-dihydroquinazolinium derivatives can be isolated or detected in solution but decompose upon standing or heating to give the corresponding quinolinium salts. (C) 2011 Elsevier Ltd. All rights reserved.
PHENYL LINKED QUINOLINYL MODULATORS OF ROR-GAMMA-T