反应详情

温度

80 °C

To a mixture of 2-[4-(2-amino-5-chloro-3-nitro-pyridin-4-yl)-piperazin-1-yl]-N-thiazol-2-yl-acetamide (0.044 g, 0.11 mmol) and EtOH (4.0 ml) was added 4-morpholin-4-ylmethyl-benzaldehyde (0.029 g, 0.14 mmol) followed by a freshly prepared aqueous solution of Na2S2O4 (1M; 0.44 ml, 0.44 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 6%) in ethyl acetate/dichloromethane (v:v; 1:1) afforded a yellow solid. The title compound was obtained as a pale yellow solid after trituration with diethyl ether (0.020 g, 33%); 1H-NMR (500 MHz, DMSO-d6) 2.38 (br s, 4H) and 3.59 (t, J=4.5 Hz, 4H) (morpholine N(CH2)2 and morpholine O(CH2)2), 2.78 (br s, 4H, piperazine N(CH2)2), 3.40 (s, 2H) and 3.53 (s, 2H) (C6H4CH2N and NCH2CO), 3.75 (br s, 4H, piperazine N(CH2)2), 7.24 (d, J=3.5 Hz, 1H, thiazole-H), 7.48 (m, 3H, 3,5-C6H4— and thiazole-H), 8.12 (d, J=9.7 Hz, 2H, 2,6-C6H4—), 8.15 (s, 1H, imidazo[4,5-b]pyridine 5-H), 11.89 (s, 1H, CONH), 13.46 (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 6%) in ethyl acetate/dichloromethane (v:v; 1:1)
5. customafforded a yellow solid