Process for the preparation of novel benzopyrane derivatives

Details Process for the preparation of novel benzopyrane derivatives Process for the preparation of novel benzopyrane derivatives

1980-01-07

1981-09-08

Chan, Nicky

Drug, bio-affecting and body treating compositions

Nonspecific immunoeffector, per se ; or nonspecific...

Lipid or oil

2603452, C07D31122, A61K 3135

Patent

active

042884500

ABSTRACT:
The present invention relates to novel benzopyrane derivatives, especially 3-oxaloamino-4-oxo-4H-1-benzopyrane derivatives of the formula I ##STR1## in which Ph is substituted or unsubstituted 1,2-phenylene, R is free, esterified or amidated carboxyl and R.sub.1 is hydrogen or a substituted or substituted hydrocarbon radical, in the free from or in the form of a salt, exhibit antiallergic activities and are accordingly useful as active ingredients of antiallergic pharmaceutical preparations.

REFERENCES:
patent: 3862143 (1975-01-01), Klutchko et al.
patent: 3937719 (1976-02-01), Sellstedt et al.
patent: 3952013 (1976-04-01), Hazard et al.
patent: 4076729 (1978-02-01), Connor et al.

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