[Br:1][C:2]1[CH:3]=[CH:4][C:5](I)=[C:6]([CH2:8][NH2:9])[CH:7]=1.C(N(CC)C(C)C)(C)C.[C:20](#[N:24])[CH2:21][C:22]#[N:23].N>CN(C)C=O.CCOCC>[NH2:24][C:20]1[N:9]=[CH:8][C:6]2[C:5]([C:21]=1[C:22]#[N:23])=[CH:4][CH:3]=[C:2]([Br:1])[CH:7]=2
To a stirred solution of (5-bromo-2-iodophenyl)methanamine (40 g, 0.129 mol) in N,N-dimethylformamide (500 mL) was sequentially added N,N-diisopropylethylamine (33.3 g, 0.257 mol), malononitrile (16.9 g, 0.257 mol) and CuBr (36.9 g, 0.257 mol). The mixture was stirred at room temperature overnight. After that, to the reaction mixture was added ether and 10% NH3 (1 L, 1:1) and stirred at room temperature overnight open to the air. The mixture was separated and the residue was extracted with ethyl acetate three times, and the combined organic extracts were washed with brine, filtered, and evaporated to yield 20 g (62%) of 3-amino-7-bromoisoquinoline-4-carbonitrile. LCMS (ESI): M+H=247.7; 1H NMR (400 MHz, DMSO-d6) δ 9.03 (s, 1H), 8.23 (d, J=2.0 Hz, 1H), 7.81 (dd, J=2.0, 9.2 Hz, 1H), 7.56 (d, J=9.2 Hz, 1H), 7.42 (s, 2H).
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