Process for the preparation of novel benzopyrane derivatives
AssigneeCiba-Geigy Corporation
InventorsGeorges Haas, Alberto Rossi, Knut A. Jaeggi, Alex Sele
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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.
Claims8
A 3-oxaloamino-4-oxo-4H-1-benzopyrane derivative of the formula I ##STR9## in which R is carboxyl, lower alkoxycarbonyl or carbamyl which is unsubstituted or mono- or di-sub-stituted by lower alkyl, Ph is 1,2-phenylene which is di-substituted by lower alkyl, or, at two adjacent carbon atoms, by 3-membered or 4-membered lower alkylene, and R.sub.1 is hydrogen or lower alkyl, in the free form or in the form of a salt.
Dependencies are inferred from the claim text.