Importance

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Abstract

Compounds of formula I: ##STR1## are described in which R.sup.1 is a linear or branched alkyl radical containing between 1 and 5 carbon atoms, the alkyl radical being unsubstituted or substituted by an alkoxy group; R.sup.2 is an unsubstituted phenyl of phenyl substituted by a nitro group; R.sup.3 is hydrogen or a linear or branched alkyl residue containing between 1 and 4 carbon atoms, the alkyl radical being unsubstituted or substituted by at least one alkoxy or fluorine atom or both alkoxy and fluorine atoms; R.sup.4 is hydrogen or a linear or branched alkyl containing between 1 and 4 carbon atoms, the alkyl radical being unsubstituted or substituted by alkoxy, carbalkoxy, dialkylamino, 1-aryl or 1-heteroarylpiperazinyl, aryl or a monocyclic 5 or 6 membered heterocycle in which at least one of the heteroatoms is N,O,S such as 1-piperidinyl, 4-morpholinyl or R.sub.4 is alkenyl or cyclo(C.sub.3 -C.sub.6)alkyl; and enantiomers, racemates, diastereoisomers and isomers (E) and (Z) and their salts with pharmaceutically acceptable acids. The novel compounds exhibit calcium-antagonistic activity.

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First Claim