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This was prepared using the same procedure as for 4-(6-bromo-2-(4-(dimethylamino)phenyl)-3H-imidazo[4,5-b]pyridin-7-yl)-N-phenylpiperazine-1-carboxamide, but here using 5-bromo-3-nitro-4-(4-(1-(pyridin-4-yl)ethyl)piperazin-1-yl)pyridin-2-amine (50 mg, 0.12 mmol), DMF (0.15 mL), ethanol (0.85 mL), 1M Na2S2O4 (3 eq, 0.37 mmol, 0.37 mL) and 3-[(4-methylpiperazin-1-yl)methyl]benzaldehyde (1.1 eq, 0.14 mmol, 29 mg). After 6 h, concentration in vacuo and purification by preparative tlc (CH2Cl2-MeOH, 9:1) gave the product (19 mg, 27%) as a colourless solid; δH (500 MHz, DMSO-d6) 1.37 (d, J=6.7 Hz, 3H, CHCH3), 2.17 (s, br, 4H, piperazine N(CH2)2), 2.37-2.48 (m, br, 4H, piperazine N(CH2)2), 2.55-2.58 (m, br, 4H, piperazine N(CH2)2), 2.64-2.67 (m, br, 4H, piperazine N(CH2)2), 3.56 (s, 2H, NCH2Ar), 3.60 (q, J=6.5 Hz, 1H, CHCH3), 3.68 (s, br, 4H, piperazine N(CH2)2), 7.41 (d, J=5.9 Hz, 2H, pyridine H-3 & H-5), 7.43 (d, J=7.7 Hz, 1H, phenyl H-6), 7.50 (t, J=7.7 Hz, 1H, phenyl H-5), 8.06 (d, J=7.7 Hz, 1H, phenyl H-4), 8.14 (s, br, 1H, phenyl H-2), 8.24 (s, 1H, imidazo[4,5-b]pyridine H-5), 8.56 (d, J=5.9 Hz, 1H, pyridine H-2 & H-6), 13.52 (s, br, 1H, imidazo[4,5-b]pyridine NH);

1. customThis was prepared
2. concentrationconcentration
3. customin vacuo and purification by preparative tlc (CH2Cl2-MeOH, 9:1)