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Synthetic Communications1, 42: 2574–2584, 2012 Copyright # Taylor Francis Group, LLC ISSN: 0039-7911 print=1532-2432 online DOI: 10.10802011.563022 OXIDANT EFFECT OF H O FOR THE SYNTHESES OF 2 2 QUINOLINE DERIVATIVES VIA ONE-POT REACTION OF ANILINE AND ALDEHYDE Qiaoxia Guo, Wennian Wang, Weiling Teng, Liwei Chen, Yanqing Wang, and Baojian Shen State Key Laboratory of Heavy Oil Processing, College of Science, China University of Petroleum, Beijing, China GRAPHICAL ABSTRACT Abstract A convenient one-pot method for the synthesis of substituted quinolines via the reaction of aniline and aldehyde in the presence of a Lewis acid (AlCl ) and an oxidant 3 (H O ) has been developed. Hydrogen peroxide was found to promote the reaction by 2 2 its function as a hydrogen hunter, hindering the formation of by-product N-alkylaniline. The effect of the oxidant on the yield and selectivity was studied. When the molar ratio of aniline, n-butyraldehyde, and H O was 1:3:0.5 at 25 C, the yield of 3-ethyl-2-propyl- 2 2 quinoline was improved from 64% (reaction without H O ) to 84% (with H O ), and 2 2 2 2 the quinoline selectivity was improved to almost 100%. Moreover, the reaction time was obviously reduced. The substi

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