RuCl2(dmso)4 Catalyzes the Solvent-Free Indirect Friedländer Synthesis of Polysubstituted Quinolines from Alcohols
作者:Ricardo Martínez、Diego J. Ramón、Miguel Yus
DOI:10.1002/ejoc.200600945
日期:2007.4
The first synthesis of polysubstituted quinoline derivatives from aromatic or aliphatic alcohols with RuCl2(dmso)4 as catalyst under solvent-free conditions is described. The reaction involves the in situ oxidation of alcohols to the corresponding carbonyl compounds through a hydrogen-transfer, followed by a Friedlander annulation process. The whole process is a mild, efficient, selective, and high-yielding
2,4-Disubstituted quinolines have been synthesized by reactions of o-isocyano-beta-methoxystyrenes, which can be easily prepared from commercially available o-aminophenyl ketones in three steps, with alkyl(or aryl)lithiums in generally good yields. Subsequently, oisocyano-beta-methoxystyrenes have also proved to react efficiently with lithium dialkylamides to afford the corresponding 4-substituted N,Ndialkylquinolin-2-amines in satisfactory yields. (C) 2004 Elsevier Ltd. All rights reserved.