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

1978-07-11

1980-08-05

Chan, Nicky

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603403, 2603405R, 424283, 424278, C07D31122, A61K 3135, C07D31178, C07D49304

Patent

active

042161550

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 form or in the form of a salt, exhibit antiallergic activities and are accordingly useful as active ingredients of antiallergic pharmaceutical preparations.

REFERENCES:
patent: 3937719 (1976-02-01), Sellstedt et al.
patent: 4076729 (1978-02-01), Connor et al.

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