Synthesis of novel pyridocoumarins and benzo-fused 6-azacoumarins
摘要:
Benzo[7,8]-fused 6-azacoumarins are prepared from 4-quinolinol by treatment with PPh3 and DMAD, or from 3-formyl-4-quinolinol by Wittig reaction with carbalkoxyalkylidene(triphenyl) phosphoranes. Angular pyridocoumarins are prepared from 8- or 6-quinolinols with PPh3 and DMAD, or from the reactions of 5,6- or 7,8-quinolinediones with carbalkoxymethylene(triphenyl) phosphoranes. (c) 2007 Elsevier Ltd. All rights reserved.
Twenty-five 8-amino-5, 6-quinolinediones were prepared by copper(II)-catalyzed oxidation of 6-quinolinol in methanol with secondary amines, or by oxidative demethylation of the corresponding 5, 6-dimethoxyquinolines in aqueous acetonitrile with cerium(IV) ammonium nitrate.
Synthesis of novel pyridocoumarins and benzo-fused 6-azacoumarins
作者:Evangelia Galariniotou、Vakis Fragos、Aristea Makri、Konstantinos E. Litinas、Demetrios N. Nicolaides
DOI:10.1016/j.tet.2007.05.102
日期:2007.8
Benzo[7,8]-fused 6-azacoumarins are prepared from 4-quinolinol by treatment with PPh3 and DMAD, or from 3-formyl-4-quinolinol by Wittig reaction with carbalkoxyalkylidene(triphenyl) phosphoranes. Angular pyridocoumarins are prepared from 8- or 6-quinolinols with PPh3 and DMAD, or from the reactions of 5,6- or 7,8-quinolinediones with carbalkoxymethylene(triphenyl) phosphoranes. (c) 2007 Elsevier Ltd. All rights reserved.