HETEROARYL SUBSTITUIERTE HYDROXYLAMINDERIVATE ALS LIPOXYGENASE-INHIBITOREN

Disclosed are the compound of the formula wherein R represents hydrogen, lower alkyl, aryl, biaryl, C3-C7-cycloalkyl, aryl-lower alkyl, aryl-lower alkenyl, aryl-lower alkynyl, aryloxy-lower alkyl, arylthio-lower alkyl, C3-C7-cycloalkyl-lower alkyl, biaryl-lower alkyl, aryl-C3-C7-cycloalkyl, aryl-C3-C7-cycloalkyl-lower alkyl or aryloxy-aryl-lower alkyl; and aryl represents carbocyclic or heterocyclic aryl; Z represents C1-C3-alkylene or vinylene, each unsubstituted or substituted by lower alkyl; Y represents SO2 (sulfonyl) or CO (carbonyl); A represents O (oxygen), S (sulfur), or a direct bond; B represents lower alkylene; or B represents lower alkenylene provided that A represents a direct bond; X represents oxygen or sulfur, R1 represents hydrogen, acyl, lower alkoxycarbonyl, aminocarbonyl, mono- or di-lower alkylaminocarbonyl, lower alkenylaminocarbonyl, lower alkynylaminocarbonyl, carbocyclic or heterocyclic aryl-lower alkylaminocarbonyl, carbocyclic or heterocyclic arylaminocarbonyl, C3-C7-cycloalkylaminocarbonyl or C3-C7-cycloalkyl-lower alkylaminocarbonyl; R2 represents lower alkyl, lower alkoxycarbonyl-lower alkyl, C3-C7-cycloalkyl, carbocyclic or heterocyclic aryl, carbocyclic or heterocyclic aryl-lower alkyl, C3-C7-cycloalkyl-lower alkyl, amino, mono- or di-lower alkylamino, lower alkenylamino, lower alkynylamino, carbocyclic or heterocyclic aryl-lower alkylamino, carbocyclic or heterocyclic arylamino, C3-C7-cycloalkylamino, C3-C7-cycloalkyl-lower alkylamino or lower alkoxycarbonyl-lower alkylamino; R3 and R4 independently represent hydrogen or lower alkyl; Ra represents hydrogen, lower alkyl, halo, trifluoromethyl or lower alkoxy; and pharmaceutically acceptable salts thereof; which are useful as lipoxygenase inhibitors.