反应详情

温度

80 °C

To a mixture of 5-bromo-3-nitro-4-(4-pyridin-3-ylmethyl-piperazin-1-yl)-pyridin-2-ylamine (0.047 g, 0.12 mmol) and EtOH (3.5 ml) was added 4-morpholin-4-ylmethyl-benzaldehyde (0.032 g, 0.16 mmol) followed by a freshly prepared aqueous solution of Na2S2O4 (1M; 0.48 ml, 0.48 mmol). The reaction mixture was stirred at 80° 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 of the column with a gradient of methanol (2 to 12%) in ethyl acetate/dichloromethane (v:v; 4:1) afforded a yellow solid which was triturated with diethyl ether. The precipitate was collected by filtration, and was successively washed with diethyl ether, water, and diethyl, then dried in vacuo (0.009 g, 14%). 1H-NMR (500 MHz, DMSO-d6) 2.38 (br t, 4H) and 3.59 (t, J=4.6 Hz, 4H) (morpholine N(CH2)2 and morpholine O(CH2)2), 2.62 (br s, 4H, piperazine N(CH2)2), 3.67 (br s, 4H, piperazine N(CH2)2), 3.53 (s, 2H) and 3.62 (s, 2H) (NCH2-pyridyl and C6H4CH2), 7.39 (dd, J=5.3, 7.1 Hz, pyridine 5-H), 7.47 (d, J=7.7 Hz, 2H) and 8.14 (d, J=8.0 Hz, 2H) (3,5-C6H4 and 2,6-C6H4), 7.78 (d, J=7.5 Hz, 1H, pyridine 4-H), 8.23 (s, 1H, imidazo[4,5-b]pyridine 5-H), 8.50 (dd, J=1.6, 4.7 Hz, 1H, pyridine 6-H), 8.56 (d, J=1.6 Hz, 1H, pyridine 6-H), 13.48 (br s, 1H, imidazo[4,5-b]pyridine N—H);

1. temperatureto cool to room temperature
2. concentrationconcentrated in vacuo
3. customThe residue was absorbed on silica gel
4. washthe free-running powder was placed on a 10 g isolute silica column, and elution of the column with a gradient of methanol (2 to 12%) in ethyl acetate/dichloromethane (v:v; 4:1)
5. customafforded a yellow solid which
6. customwas triturated with diethyl ether
7. filtrationThe precipitate was collected by filtration
8. washwas successively washed with diethyl ether, water, and diethyl
9. customdried in vacuo (0.009 g, 14%)