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US 4,066,655 AGranted
4,10-Dihydro-4,10-dioxo-1H-1-benzopyrano[3,2-b]pyridine-3-carboxylic acids, salts and esters
AssigneeWarner-Lambert Company
InventorsDavid T. Connor, Patricia A. Young, Max VON Strandtmann
Life of this patent
Estimating the term…
Abstract
The present invention relates to 4,10-dihydro-4,10-dioxo-1H-1-benzopyrano[3,2-b]pyridine-3-carboxylic acids, salts and esters having the formula: ##STR1## wherein R.sub.1 is hydrogen, lower alkyl, halogen, hydroxy or lower alkoxy; R.sub.2 is hydrogen, aralkyl or lower alkyl; R.sub.3 is hydrogen or lower alkyl and their pharmaceutically acceptable salts. These compounds are indicated in the management of allergic conditions such as bronchial asthma, hay fever and the like.
Claims15
A compound of the formula:
- ##STR23## wherein R.sub.1 is hydrogen, lower alkyl, halogen, hydroxy or lower alkoxy;
- R.sub.2 is hydrogen phenyl lower alkyl or lower alkyl;
- R.sub.3 is hydrogen or lower alkyl and their pharmaceutically acceptable salts.
Dependencies are inferred from the claim text.