Importance

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Abstract

The invention concerns compounds of formula ##STR1## or salts thereof; wherein: .alpha. and .beta. together represent a bond and additionally when B is an electron withdrawing group .alpha. can also represent OH and .beta. can represent hydrogen; Ar is an optionally substituted aryl or heteroaryl radical; R represents hydrogen or an optionally substituted alkyl or aralkyl group; R.sup.1 and R.sup.2 are the same or different and are selected from hydrogen and saturated or unsaturated, cyclic or acyclic aliphatic hydrocarbon residues optionally substituted by one or more groups selected from halogen, OH, carboxy, CN, alkoxy, alkylthio, aryloxy, alkoxycarbonyl, amino, substituted amino, and optioanlly substituted aryl or heteroaryl; A represents a group of formula --XR.sup.3 wherein X is a group of formula --(CHR.sup.6).sub.p --Y--(CHR.sup.7).sub.q -- in which formula: Y represents --O--, --S--, NR.sup.8 or a direct bond, p and q each represent 0, 1 or 2 R.sup.6, R.sup.7 and R.sup.8 independently represent hydrogen or lower alkyl and R.sup.3 is an optionally substituted nitrogen ring heteroaryl radical optionally containing other ring heteratoms selected from oxygen, nitrogen or sulphur; B represents haloalkyl, optionally substituted phenyl, --CN, --CHO, --CH(Oloweralkyl).sub.2 or --CH.sub.2 OH.

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First Claim