Abstract: The present invention relates to new compounds of the general formula: ##STR1## in which Ar represents thienyl, furyl, pyridyl or an optionally substituted phenyl group,R represents a linear or branched alkyl group with 1 to 7 carbon atoms, andeither X.sub.1 or X.sub.2 represents nitrogen, the other being carbon,and pharmaceutically acceptable acid addition salts thereof, having valuable cardiovascular properties.

Abstract: The invention is dealing with compounds of the formula: ##STR1## and pharmaceutically acceptable salts thereof, in which R.sub.1 and R.sub.2 each represent a lower alkyl radical or a phenyl radical, or, together with the carbon atom to which they are bound, a cycloalkyl radical having at the most 7 carbon atoms; R.sub.3 represents hydrogen, a lower alkyl radical, or the phenyl radical; R.sub.4 and R.sub.5 each represent a lower alkyl radical, or, together with the nitrogen atom to which they are bound, a heterocyclic amino radical such as the pyrrolidinyl or morpholino radicals; and R.sub.6 represents a lower alkyl radical, a phenyl radical, a benzyl radical, or the 1-ethynyl-cyclohexyl radical, which compounds can be used in the treatment of angina pectoris.