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Synthesis 1991; 1991(9): 727-730
DOI: 10.1055/s-1991-26557
DOI: 10.1055/s-1991-26557
paper
© Georg Thieme Verlag, Rüdigerstr. 14, 70469 Stuttgart, Germany. All rights reserved. This journal, including all individual contributions and illustrations published therein, is legally protected by copyright for the duration of the copyright period. Any use, exploitation or commercialization outside the narrow limits set by copyright legislation, without the publisher's consent, is illegal and liable to criminal prosecution. This applies in particular to photostat reproduction, copying, cyclostyling, mimeographing or duplication of any kind, translating, preparation of microfilms, and electronic data processing and storage.
A Comparative Study of Synthetic Approaches to 1-Methyl-2,5,8(1H)-quinolinetrione and 4-Methyl-2,5,8(1H)-quinolinetrione
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Publikationsverlauf
Publikationsdatum:
29. April 2002 (online)
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The best overall yield for 1-methyl-2,5,8(1H)-quinolinetrione was obtained by the dichromate oxidation of 1-methyl-8-hydroxy-2-quinolone. 4-Methyl-2,5,8(1H)-quinolinetrione was synthesized by acetoacetylation of 2,5-dimethoxyaniline with 2,2,6-trimethyl-4H-1,3-dioxin-4-one followed by oxidation with ceric ammonium nitrate.