Tetrazole derivatives
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United States of America Patent
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Jan 1, 1985
Issued Date -
N/A
app pub date -
Jul 11, 1980
filing date -
May 5, 1978
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Expired
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Abstract
6-(1H-Tetrazol-5-yl)thiazolo[3,2-a]pyrimidin-5-ones, 3-(1H-tetrazol-5-yl)-4H-pyrimido[2,1-b]benzothiazol-4-ones, and the corresponding imidazo- and triazolo- pyrimidines, thiones, and imines are useful as antiallergy and antiasthmatic compounds by virtue of their inhibitory action on the immediate hypersensitivity reaction in mammals and relaxant action on the tracheal muscle. Intermediates in the synthesis of these substances from 2-aminoazoles and ethoxymethylene malononitrile also have smooth muscle relaxant and immediate hypersensitivity reaction inhibitory activity.
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