Silica supported perchloric acid: an efficient catalyst for the synthesis of 14-aryl-14H-dibenzo[a,i]xanthene-8,13-diones
作者:Li Qiang Wu、Yan Fang Wu、Chun Guang Yang、Li Min Yang、Li Juan Yang
DOI:10.1590/s0103-50532010000500025
日期:——
The condensation of beta-naphthol with aromatic aldehydes and 2-hydroxynaphthalene-1,4-dione in presence of silica supported perchloric acid under solvent-free media to afford the corresponding 14-aryl-14H-dibenzo[a,i]xanthene-8,13-diones in excellent yields and short reaction times is described. The reaction work-up is very simple and the catalyst can be easily separated from the reaction mixture and reused several times in subsequent reactions.
Synthesis of benzoxanthene derivatives using Brønsted acidic ionic liquids (BAILs), 2-pyrrolidonium hydrogen sulfate and (4-sulfobutyl)tris(4-sulfophenyl)phosphonium hydrogen sulfate
Bronsted acidic ionic liquids (BAILs), 2-pyrrolidonium hydrogen sulfate and (4-sulfobutyl)tris(4-sulfophenyl)phosphonium hydrogen sulfate are found to be efficient catalysts for synthesis of 14-aryl-14H-dibenzo[a,i]xanthene-8,13-dione, 3,4-dihydro-1H-benzo[b]xanthene-1,6,1 1(2H,12H)-trione, and aryl-5H-dibenzo[b,i]xanthene-5,7,12,14(13H)-tetraone derivatives. (C) 2011 Elsevier B.V. All rights reserved.
Silica chloride catalyzed synthesis of 14-aryl-14H-dibenzo[a,i]xanthene-8,13-diones
作者:Liqiang Wu、Jiangli Zhang、Lizhen Fang、Chunguang Yang、Fulin Yan
DOI:10.1016/j.dyepig.2009.12.008
日期:2010.6
A simple and facile synthesis of 14-aryl-14H-dibenzo[a,i]xanthene-8,13-dione derivatives was accomplished by the one-pot condensation of beta-naphthol, aldehydes, and 2-hydroxy-1,4-naphthoquinone under solvent-free conditions in the presence of the heterogeneous catalyst, silica chloride. This method has the advantages of high yield, clean reaction, simple methodology and short reaction time. The catalyst could be recycled and reused three times without significant loss of activity. The structures of the novel compounds were confirmed by IR, (1)H NMR, (13)C NMR, and elemental analysis. (C) 2009 Published by Elsevier Ltd.