Compounds of the formula I ** Formula ** wherein R1 represents Ar or Het, R2 represents an unsaturated, saturated or aromatic 6-membered heterocycle with 1 to 4 atoms of N-, O- and / or S, which is mono- , di- or tri- substituted by N>； = CR3N (R3) 2, SR3, NO2, CN, COOR3； CON (R3) 2, NR3COA, NR3SO2A, SO2N (R3) 2, S (O) mA, [C (R3) 2] nN (R3) 2, [C (R3) 2] nHet, O [C (R3) 2] pOR3, O [C (R3) 2] nN (R3) 2, O [C (R3) 2] nC>； = C [C (R3) 2] nN (R3) 2, O [C (R3) 2 ] nN + O- (R3) 2, O [C (R3) 2] nHet, S [C (R3) 2] nN (R3) 2, S [C (R3) 2] nHet, NR3 [C (R3) 2] nN (R3) 2, NR3 [C (R3) 2] nHet, NHCON (R3) 2, NHCONH [C (R3) 2] nN (R3) 2, NHCONH [C (R3) 2] nHet, [C (R3) 2] nNHCO [C (R3) 2] nN (R3) 2, [C (R3) 2] nNHCO [C (R3) 2] nHet, CON (R3) 2, CONR3 [C (R3) 2] nN (R3) 2, CONR3 [C (R3) 2] nNR3COOA, CONR3 [C (R3) 2] nOR3, CONR3 [C (R3) 2] nHet, COHet, COA, CH>； = CH-COOR3 and / or CH >； = CH-N (R3) 2, R3 represents H or A, R4, R4, respectively independently of each other, represent H, Hal, A, OR3, CN, COOR3, CON (R3) 2, NR3COA, NR3SO2A, SO2N (R3) 2 or S (O) mA, Ar represents phenyl, naphthyl or unsubstituted biphenyl or mono-, di- or tri- substituted by Hal, A, [C (R3) 2] nOR3, [C ( R3) 2] nN (R3) 2, SR3, NO2, CN, COOR3, CON (R3) 2, NR3COA, NR3SO2A, SO2N (R3) 2, S (O) mA, CO-Het, Het, O [C ( R3) 2] nN (R3) 2. O [C (R3) 2] nHet, NHCOOA, NHCON (R3) 2, NHCOO [C (R3) 2] nN (R3) 2, NHCOO [C (R3) 2] nHet, NHCONH [C (R3) 2] nN (R3) 2, NHCONH [C (R3) 2] nHet, OCONH [C (R3) 2] nN (R3) 2, OCONH [C (R3) 2] nHet, CONR3 [C (R3) 2] nN ( R3) 2, CONR3 [C (R320) 2] nHet and / or COA, Het represents a saturated, unsaturated or aromatic mononuclear, binuclear or trinuclear heterocycle with 1 to 4 atoms of N, O and / or S, which may not be substituted or mono- di-, tri-, tetra- or penta- substituted by Hal, A, [C (R3) 2] nOR3, [C (R3) 2] nN (R3) 2, SR3, NO2, CN, COOR3 , WITH (R3) 2, NR3COA, NR3SO2A, SO2N (R3) 2, S (O) mA, CO-Het1, [C (R3) 2] nHet1, O [C (R3) 2] n (R3) 2, O [C (R3) 2] nHet1,
