Pyridazinone derivatives

A compound of the formula I

• in which
• R1 denotes H, A, Ar or Het,
• R2 denotes H, A, Hal, OR3, N(R3)2, N═CR3N(R3)2, SR3, NO2, CN, COORS, CON(R3)2, NR3COA, NR3SO2A, SO2N(R3)2, S(O)mA, Het, —[C(R3)2]nN(R3)2, —[C(R3)2]nHet, O[C(R3)2]nN(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, NHCO[C(R3)2]nN(R3)2, NHCO[C(R3)2]nHet, CON(R3)2, CONR3[C(R3)2]nN(R3)2, CONR3[C(R3)2]nHet, COHet or COA,
• R3 denotes H or A,
• W denotes a five- or six-membered unsaturated or aromatic heterocycle having 1 to 3 N, O and/or S atoms, which may be unsubstituted or mono-, di- or trisubstituted by Hal and/or A,
• D denotes a five- or six-membered unsaturated or aromatic heterocycle having 1 to 3 N, O and/or S atoms, which may be unsubstituted or mono-, di- or trisubstituted by Hal and/or A,
• A denotes unbranched or branched alkyl having 1-10 C atoms, in which 1-7H atoms may be replaced by OH, F, Cl and/or Br, and/or in which one or two CH2 groups may be replaced by O, NH, S, SO, SO2 and/or CH═CH groups,
• or
• cyclic alkyl having 3-7 C atoms,
• Ar denotes phenyl, naphthyl or biphenyl, each of which is unsubstituted or mono-, di- or trisubstituted by Hal, A, OR3, N(R3)2, SR3, NO2, CN, COOR3, CON(R3)2, NR3COA, NR3SO2A, SO2N(R3)2 and/or S(O)mA,
• Het denotes a mono-, bi- or tricyclic saturated, unsaturated or aromatic heterocycle having 1 to 4 N, O and/or S atoms, which may be unsubstituted or mono-, di- or trisubstituted by Hal, A, OR3, N(R3)2, SR3, NO2, CN, COOR3, CON(R3)2, NR3COA, NR3SO2A, SO2N(R3)2, S(O)mA, CO-Het1, Het1, [C(R3)2]n—N(R3)2, [C(R3)2]nHet1, O[C(R3)2]nN(R3)2, O[C(R3)2]nHet1, NHCOOA, NHCON(R3)2, NHCOO[C(R3)2]nN(R3)2, NHCOO[C(R3)2]nHet1, NHCONH[C(R3)2]nN(R3)2, NHCONH[C(R3)2]nHet1, OCONH[C(R3)2]nN(R3)2, OCONH[C(R3)2]nHet1, CO-Het1, CHO, COA, ═S, ═NH, ═NA and/or ═O (carbonyl oxygen),
• Het1 denotes a monocyclic saturated heterocycle having 1 to 2 N and/or O atoms, which may be mono- or disubstituted by A, OA, OH, Hal and/or ═O (carbonyl oxygen),
• Hal denotes F, Cl, Br or I,
• m denotes 0, 1 or 2,
• n denotes 1, 2, 3 or 4,
• and pharmaceutically usable salts, tautomers and stereoisomers thereof, including mixtures thereof in all ratios.