反应详情

温度

80 °C

To a mixture of 5-bromo-3-nitro-4-(4-pyridin-4-ylmethyl-piperazin-1-yl)-pyridin-2-ylamine (0.040 g, 0.10 mmol) and EtOH (3.0 ml) was added 4-(2-morpholin-4-yl-ethoxy)-benzaldehyde (0.031 g, 0.13 mmol) with the aid of ethanol (1 ml) followed by a freshly prepared aqueous solution of Na2S2O4 (1M; 0.40 ml, 0.40 mmol). The reaction mixture was stirred at 80° C. for 20 h, then allowed to cool to room temperature and concentrated in vacuo. The resulting residue was absorbed on silica, and the free-running powder was placed on a 10 g isolute silica column. Elution with a gradient of methanol (0 to 10%) in ethyl acetate/dichloromethane (v:v; 1:1). afforded a pale yellow solid. This material was triturated with diethyl ether, and the resulting white precipitate was collected by filtration, and successively washed with diethyl ether, water, and diethyl ether, then dried in vacuo (0.014 g, 24%); 1H-NMR (500 MHz, DMSO-d6) 2.63 (br s, 4H, piperazine N(CH2)2), 2.72 (t, J=5.7 Hz, 2H, OCH2CH2N), 3.59 (t, J=4.7 Hz, 4H, morpholine O(CH2)2), 3.62, (s, 2H, NCH2-pyridyl), 3.68 (br t, 4H, piperazine N(CH2)2), 4.18 (t, J=5.8 Hz, 2H, OCH2CH2N), 7.11 (d, J=8.9 Hz, 2H) and 8.12 (d, J=8.9 Hz, 2H) (3,5-C6H4— and 2,6-C6H4—), 7.39 (d, J=5.9 Hz, 2H, pyridine 3-H, 5-H), 8.20 (s, 1H, imidazo[4,5-b]pyridine 5-H), 8.54 (d, J=5.9 Hz, 2H, pyridine 2-H, 6-H), 13.34 (br s, 1H, imidazo[4,5-b]pyridine N—H);

1. temperatureto cool to room temperature
2. concentrationconcentrated in vacuo
3. customThe resulting residue was absorbed on silica
4. washElution with a gradient of methanol (0 to 10%) in ethyl acetate/dichloromethane (v:v; 1:1)
5. customafforded a pale yellow solid
6. customThis material was triturated with diethyl ether
7. filtrationthe resulting white precipitate was collected by filtration
8. washsuccessively washed with diethyl ether, water, and diethyl ether
9. customdried in vacuo (0.014 g, 24%)