[CH2:1]([N:8]1[C:12]2=[C:13](Cl)[N:14]=[N:15][CH:16]=[C:11]2[C:10]([Br:18])=[C:9]1[CH3:19])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.O.Cl>C(N)C1C=CC=CC=1>[CH2:1]([N:8]1[C:12]2=[C:13]([NH:8][CH2:1][C:2]3[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=3)[N:14]=[N:15][CH:16]=[C:11]2[C:10]([Br:18])=[C:9]1[CH3:19])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1A solution of 1.0 g (2.97 retool) of 1-benzyl-3 -bromo-7-chloro-2-methylpyrrolo [2,3-d]pyridazine in 5 ml of benzylamine is heated to 150° C. for 5 h and subsequently cooled to room temperature. The solution is then treated with 50 ml of water, adjusted to pH 6 with 2 N hydrochloric acid and extracted with 2×50 ml of dichloromethane. The organic extracts are dried over magnesium sulfate and concentrated. The residue which remains is chromatographed on silica gel (eluent: toluene/dioxane=2:1). After concentration of the fractions of Rf=0.25 and crystallization from diisopropyl ether, 1.01 g (84%) of the title compound are isolated. M.p.: 185°-188° C.
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