反应详情

温度

85 °C

To a mixture of 5-bromo-3-nitro-4-(4-(thiazol-4-ylmethyl)piperazin-1-yl)pyridin-2-amine (0.045 g, 0.11 mmol), EtOH (2.6 mL) and DMF (0.35 mL), p-anisaldehyde (0.017 g, 0.12 mmol) was added followed by a freshly prepared aqueous solution of Na2S2O4 (1M; 0.33 mL, 0.33 mmol). The reaction mixture was heated at 85° C. for 24 h, then allowed to cool to room temperature and diluted with DCM and a few drops of aqueous NH3 until complete dissolution was observed. This solution was deposited on two preparative silica TLC plates and eluted with DCM/MeOH (v/v 96:4) to give the title compound as a white solid (0.026 g, 49%); 1H-NMR (500 Mz, DMSO-d6): δ 2.64-2.72 (m, 4H, piperazine N(CH2)2), 3.61-3.70 (m, 4H, piperazine N(CH2)2), 3.77 (br s, 2H, NCH2), 3.84 (s, 3H, OMe), 7.10 (d; J=9.0 Hz, 2H, ArH, C6H4), 7.58 (d, J=2.0 Hz, 1H, thiazole 5-H), 8.14 (d, J=7.0 Hz, 2H, ArH, C6H4), 8.20 (s, 1H, imidazo[4,5-b]pyridine 5-H), 9.07 (d, J=2.0 Hz, 1H, thiazole 2-H), 13.33 (br s, 1H, imidazo[4,5-b]pyridine N—H); LC (Method B)-MS (ESI, m/z) 3.07 min—485/487 [(M+H)+, Br isotopic pattern]. ESI-HRMS: Found: 485.0759, calculated for C21H22BrN6OS (M+H)+: 485.0742.

1. additionwas added
2. temperatureto cool to room temperature
3. washeluted with DCM/MeOH (v/v 96:4)