Facile, One-Pot, Three-Component Synthesis of Benzo[<i>a</i>]naphthacene-8,13-diones
作者:Vakiti Srinivas、Vedula Rajeswar Rao
DOI:10.1080/00397911.2010.524961
日期:2012.2.1
One-pot synthesis of 14-aryl-14H-7-oxa-benzo[a]naphthacene-8,13-diones was developed by the reaction of 2-hydroxynaphthalene-1,4-dione, aromatic aldehydes, and 2-naphthol in the presence of acetic acid. The structures of these compounds were identified by elemental analyses, infrared, H-1 NMR, and mass.
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.
Phosphoric acid supported on alumina (H3PO4/Al2O3) as an efficient and reusable catalyst for the one-pot synthesis of benzoxanthene pigments
Phosphoric acid supported on alumina (H3PO4/Al2O3) is an efficient catalyst for the catalytic multi-component condensation reaction and a wide variety of syntheses of benzoxanthene pigments in good yields. The remarkable features of this new procedure are high conversions, shorter reaction times, cleaner reaction, and simple experimental and work-up procedures.