[NH2:1][C:2]1[C:3]([C:9]([NH:11][CH3:12])=[O:10])=[N:4][C:5](Br)=[CH:6][N:7]=1.CN(C)C=O.ClCCl.[NH2:21][C:22]1[CH:23]=[C:24](B(O)O)[CH:25]=[CH:26][CH:27]=1.C(N(CC)CC)C>Cl>[NH2:1][C:2]1[C:3]([C:9]([NH:11][CH3:12])=[O:10])=[N:4][C:5]([C:26]2[CH:25]=[CH:24][CH:23]=[C:22]([NH2:21])[CH:27]=2)=[CH:6][N:7]=1To a solution of 3-amino-6-bromo-N-methyl-2-pyrazinecarboxamide (1.23 g, 5.30 mmol) in N,N-dimethylformamide (30 mmol) were added [1,1′-bis(diphenylphosphino)-ferrocene]dichloropalladium(II) complex with dichloromethane (1:1, 433 mg, 0.53 mmol), 3-aminophenylboronic acid (1.15 g, 7.41 mmol), and triethylamine (1.07 g, 10.6mmol). The solution was degassed with nitrogen 3-5 min. The reaction was heated at 85-90° C. for 15 h with stirring. The reaction was allowed to cool to room temperature and diluted with ethyl acetate (400 mL). The organic layer was washed with saturated aqueous sodium bicarbonate (50 mL), saturated aqueous sodium chloride (50 mL), dried over magnesium sulfate, filtered, and concentrated to give crude product. To the crude product was added 4.0 N hydrochloric acid (1,4-dioxane solution, 30 mL). The resulting solid was filtered and washed with diethyl ether/methanol (4:1). The solid was dissolved in methanol and neutralized with sufficient AG 1-X8 Resin (hydroxide form) that the pH of the solution became basic. The mixture was filtered, and the filtrate was concentrated on a rotary evaporator at reduced pressure to afford 3-Amino-6-(3-aminophenyl)-N-methylpyrazine-2-carboxamide (0.70 g, 54% yield) as dark green solid. 1H NMR (400 MHz, d6-DMSO): 8.70(br s, 1H), 8.62 (s, 1H), 7.60 (br s, 2H), 7.25 (m, 2H), 7.10 (t,. 1H), 6.15 (d, 1H), 5.06 (s, 2H), 2.8 (br s, 3H); MS (EID for C12H13N5O: 244 ).
불러오는 중…
