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US 4,052,393 AGranted
4-Substituted derivatives of pyrazolo [1,5-a]-quinoxaline-3-carboxylic acids and esters
AssigneeE. R. Squibb & Sons, Inc.
InventorUwe D. Treuner
Life of this patent
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Abstract
New 4-substituted derivatives of pyrazolo[1,5-a]-quinoxaline-3-carboxylic acid, esters and their salts have the formula ##STR1## R.sub.1 is hydrogen, lower alkyl or a salt forming ion; R.sub.2 is hydrogen, lower alkyl, phenyl-lower alkylene or amino-lower alkylene; R.sub.3 is hydrogen, lower alkyl, halogen or lower alkoxy; and X is oxygen or sulfur. The new compounds are useful as anti-inflammatory agents.
Claims12
A compound of the formula ##STR35## wherein R.sub.1 is hydrogen or lower alkyl;
- R.sub.2 is hydrogen, lower alkyl, phenyl-lower alkylene or ##STR36## wherein R.sub.4 and R.sub.5 each is hydrogen or lower alkyl or together with the nitrogen complete one of the heterocyclics pyrrolidion, piperidino, said heterocyclics being unsubstituted or substituted with one or two lower alkyl groups;
- R.sub.3 is hydrogen, lower alkyl, halogen or lower alkoxy;
- X is oxygen or sulfur;
- and salts thereof.
1 more element
Dependencies are inferred from the claim text.