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

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

1976-10-29

1977-09-06

Weinberger, Lorraine A.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

424263, 2603452, C07D49104

Patent

active

040467694

ABSTRACT:
There is disclosed 4,10-dihydro-4,10-dioxo-1H-1-benzopyrano[3,2-b]pyridine-2-carboxylic acids, salts and esters of 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 useful in the management of allergic conditions such as bronchial asthma, hay fever and so on.

REFERENCES:
patent: 3689497 (1972-09-01), Brown et al.
patent: 3706764 (1972-12-01), Oita et al.

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