CC1(C)C(C)(C)OB([C:9]2[CH:10]=[CH:11][C:12]([NH2:15])=[N:13][CH:14]=2)O1.Br[C:18]1[CH:23]=[CH:22][N:21]=[N:20][CH:19]=1.[O-]P([O-])([O-])=O.[K+].[K+].[K+].O1CCOCC1>C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.O>[N:20]1[CH:19]=[CH:18][C:23]([C:9]2[CH:10]=[CH:11][C:12]([NH2:15])=[N:13][CH:14]=2)=[CH:22][N:21]=1To a reaction tube were added 5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-amine (220 mg, 1.00 mmol), 4-bromopyridazine (159 mg, 1.00 mmol), Pd(PPh3)4 (57.7 mg, 0.05 mmol) and K3PO4 (424 mg, 2.00 mmol). The tube was subjected to vacuum and back filled with argon. Dioxane (3.0 ml) and water (0.3 ml) were added and the mixture was heated at 96° C. overnight. After cooled to room temperature, the reaction mixture was filtered through celite (washed with ethyl acetate) and concentrated by evaporation. Subsequent silica gel column chromatography with 5% methanol in DCM as eluent gave 5-(pyridazin-4-yl)pyridin-2-amine 134-1 as brown solid.
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