8-azaxanthine derivatives, and pharmaceutical compositions containing them
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United States of America Patent
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Jun 5, 1990
Issued Date -
N/A
app pub date -
Aug 25, 1988
filing date -
Dec 16, 1986
priority date (Note) -
Expired
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Abstract
The present invention relates to 8-azaxanthines derivatives having antiasthmatic activity and the general formula: ##STR1## wherein: R.sub.1 is a hydrogen or a lower alkyl of from one to six carbon atoms or an arylalkyl group; R.sub.2 is a lower alkyl of from one to six carbon atoms or an aryl or an arylalkyl group; n=from 1 to 3 ##STR2## wherein: R.sub.3 and R.sub.4 are lower alkyl of one to four carbon atoms or complete together a five or six member heterocycle; and wherein the substitution in the triazole ring concerns the 7- or 8- or 9- positions: their salts which are physiologically acceptable, their pharmaceutical compositions and the process for preparing them.
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