(4-Oxo-4H-1-benzopyran-3-yl)aminooxoacetic acids and their deriv

Details (4-Oxo-4H-1-benzopyran-3-yl)aminooxoacetic acids and their deriv (4-Oxo-4H-1-benzopyran-3-yl)aminooxoacetic acids and their deriv

1976-08-02

1978-02-28

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603455, 424283, 424284, C07D31102, C07D31172, A61K 3135, A61K 31355

Patent

active

040767299

ABSTRACT:
The present invention relates to compounds of the formula: ##STR1## wherein R.sub.1 is hydrogen, halogen, hydroxy, lower alkoxy or lower alkyl, R.sub.2 is hydrogen or lower alkyl; R.sub.3 is hydrogen or lower alkyl.
These compounds, including their corresponding pharmaceutically acceptable salts, are useful in the management of allergic conditions such as hay fever and as a prophylactic in the treatment of bronchial asthma.

REFERENCES:
patent: 3862143 (1975-01-01), Klutchko et al.
patent: 3906005 (1975-09-01), Klutchko et al.

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