Sulphonylbenzyl-substituted imidazolylpropenoic acid derivatives

An aldehyde of the formula ##STR80## in which R.sup.1 represents straight-chain or branched alkyl or alkenyl each having up to 8 carbon atoms, each of which is optionally substituted by cycloalkyl having 3 to 6 carbon atoms, or

• represents cycloalkyl having 3 to 8 carbon atoms,
• R.sup.2 represents hydrogen, halogen or straight-chain or branched perfluoroalkyl having up to 8 carbon atoms,
• R.sup.5 represents hydrogen, halogen or straight-chain or branched alkyl having up to 8 carbon atoms, or represents straight-chain or branched perfluoroalkyl having up to 6 carbon atoms, or
• represents a group of the formula --OX, in which
• X denotes hydrogen, benzyl, a hydroxyl protective group selected from the group consisting of benzyloxycarbonyl, methanesulphonyl, toluenesulphonyl, 2-nitrobenzyl, 4-nitrobenzyl, 2-nitrobenzyloxycarbonyl, 4-nitrobenzyloxycarbonyl, tert-butoxycarbonYl, allyloxycarbonyl, 4-methoxycarbonyl, acetyl, trichloroacetyl, 2,2,2-trichloroethoxycarbonyl, 2,4-dimethoxybenzyloxycarbonyl, 2-(methylthiomethoxy)ethoxycarbonyl, benzoyl, 4-methylbenzoyl, 4-nitrobenzoyl, 4-fluorobenzoyl, 4-chlorobenzoyl or 4-methoxybenzoyl
• or denotes straight-chain or branched alkyi having up to 8 carbon atoms
• A represents pyrrolidinyl which is optionally substituted up to 2 times by identical or different perfluoroalkyl having up to 5 carbon atoms or a salt thereof.