Ethanol → HCID 178488862, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of 5-bromo-4-(4-cyclopropylmethyl-piperazin-1-yl)-3-nitro-pyridin-2-ylamine (0.043 g, 0.12 mmol) and EtOH (3 ml) was added 4-methoxybenzaldehyde (0.027 g, 0.18 mmol) with the aid of EtOH (1 ml), followed by a freshly prepared aqueous solution of Na2S2O4 (1M; 0.48 ml, 0.48 mmol). The reaction mixture was stirred at 70° C. for 20 h, then allowed to cool to room temperature and concentrated in vacuo. The residue was absorbed on silica gel, the free-running powder was placed on a 10 g isolute silica column and elution with a gradient of methanol (0 to 4%) in ethyl acetate/dichloromethane (v:v; 1:1) afforded a yellow solid. The title compound was obtained as a white solid after trituration with diethyl ether (0.012 g, 23%). 1H-NMR (500 MHz, DMSO-d6) 0.12 (m, 2H) and 0.50 (m, 2H) (cyclopropyl CH2), 0.90 (m, 1H, cyclopropyl CH), 2.27 (d, J=6.4 Hz, 2H, N—CH2cyclopropyl), 2.67 (br s, 4H, piperazine N(CH2)2), 3.66 (br s, 4H, piperazine N(CH2)2), 3.84 (s, 3H, OCH3), 7.10 (d, J=8.8 Hz, 2H) and 8.14 (d, J=8.8 Hz, 2H) (3,5-C6H4OMe and 2,6-C6H4OMe), 8.20 (s, 1H, imidazo[4,5-b]pyridine 5-H), 13.34 (br s, 1H, imidazo[4,5-b]pyridine N—H);

Provenance & Evidence