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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 (30 mg, 0.074 mmol), DMF (0.15 mL), ethanol (0.85 mL), 1M Na2S2O4 (3 eq, 0.22 mmol, 0.22 mL) and 4-(2-(dimethylamino)ethoxy)benzaldehyde (1.1 eq, 0.088 mmol, 17 mg). After 6 h, concentration in vacuo and purification by preparative tlc (CH2Cl2-MeOH, 85:15) gave the product (9 mg, 21%) as a colourless solid; δH (500 MHz, DMSO-d6) 1.35 (d, J=6.7 Hz, 3H, CHCH3), 2.25 (s, 6H, N(CH3)2), 2.51-2.55 (m, 2H, piperazine NCH2), 2.63-2.65 (m, 2H, piperazine NCH2), 2.67 (t, J=5.6 Hz, 2H, Me2NCH2), 3.57 (q, J=6.7 Hz, 1H, CHCH3), 3.63-3.66 (m, 4H, piperazine N(CH2)2), 4.14 (q, J=5.8 Hz, 2H, OCH2), 7.10 (d, J=8.9 Hz, 2H, phenyl H-3 & H-5), 7.39 (d, J=6.0 Hz, 2H, pyridine H-3 & H-5), 8.11 (d, J=8.8 Hz, 2H, phenyl H-2 & H-6), 8.19 (s, 1H, imidazo[4,5-b]pyridine H-5), 8.54 (d, J=5.9 Hz, 2H, pyridine H-2 & H-6), 13.33 (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, 85:15)