Chromene derivatives useful as bronchodilators and anti-arrhythmics

摘要

The present invention relates to compounds of the general formula: (I) in which: R1 is selected from hydrogen and alkoxy having 1-7 carbon atoms, R2 is hydrogen, n is selected from zero and 1, X and Y are hydrogen atoms, and Z is hydroxy, or Y and Z taken together represent an oxygen atom, or, when n=1, X and Z may represent a single bond, A represents an amino radical, and their pharmaceutically acceptable acid addition salts. These compounds are useful in particular for the treatment of asthma.