4,10-Dihydro-4,10-dioxo-1H-1-benzopyrano[3,2-b]pyridine-3-carbox

Details 4,10-Dihydro-4,10-dioxo-1H-1-benzopyrano[3,2-b]pyridine-3-carbox 4,10-Dihydro-4,10-dioxo-1H-1-benzopyrano[3,2-b]pyridine-3-carbox

1976-10-29

1978-01-03

Rotman, Alan L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260295T, 2603452, 424256, C07D49104

Patent

active

040666557

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.

REFERENCES:
patent: 3632595 (1972-01-01), Pars et al.
patent: 3878219 (1975-04-01), Lee
patent: 3991194 (1976-11-01), Harris et al.

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