Pharmaceutical preparation and use of 4-hydroxy-2-quinolinone-3-carboxylic acid esters
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United States of America Patent
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Feb 26, 1980
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N/A
app pub date -
Jun 20, 1977
filing date -
Aug 27, 1973
priority date (Note) -
Expired
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Abstract
Disclosed are compounds which are 4-hydroxy-2-quinolinone-3-carboxylic acid esters, e.g., 1-methyl-4-hydroxy-2-quinolinone-3-carboxylic acid ethyl ester, useful as anti-allergic agents and intermediates for 1-alkyl-4-alkoxy-quinolin-2(1H)-ones, and prepared by reacting an isatoic anhydride with an alkali metal salt of a malonic ester.
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