反应详情

To a solution of methyl-(2-methyl-5-pyridin-3-yl-2H-pyrazol-3-yl)-amine (150 mg, 0.8 mmol) in ice-cold DCE (2 mL) under N2 was added a solution of phosgene in toluene (20%, 0.43 mL, 0.88 mmol). The ice bath was removed after 30 min, and the mixture was stirred at room temperature for 1 h and at reflux for 2 h. The mixture was cooled to room temperature and then more phosgene (0.86 mL, 1.76 mmol) was added. The mixture was stirred at reflux for 90 min and then cooled in an ice bath. To this was added a solution of 2-methylthioethylamine (80 mg, 0.88 mmol) in DCE (2 mL). The ice bath was removed after 10 min, and the reaction mixture was stirred at reflux for 14 h, cooled, and diluted with DCE (30 mL). The diluted reaction mixture was washed with saturated NaHCO3 (20 mL), dried over MgSO4, adsorbed onto silica gel and purified using silica gel chromatography eluting with a gradient of methanol in dichloromethane to afford 1-methyl-1-(2-methyl-5-pyridin-3-yl-2H-pyrazol-3-yl)-3-(2-methylsulfanyl-ethyl)-urea as a yellow gum (14 mg, 6%): 1H NMR (400 MHz, CDCl3) δ 8.99 (d, J=1.5 Hz, 1H), 8.57 (dd, J=4.8, 1.5 Hz, 1H), 8.08 (ddd, J=8.1, 2.1, 2.1 Hz, 1H), 7.34 (dd, J=7.9, 4.8 Hz, 1H), 6.52 (s, 1H), 4.88 (br t, J=5.5 Hz, 1H), 3.80 (s, 3H), 3.41 (q, J=6.3 Hz, 2H), 3.24 (s, 3H), 2.61 (t, J=6.3, 2H), 2.06 (s, 3H); ESIMS (m/z) 292.2 [M+2].

1. customThe ice bath was removed after 30 min
2. temperatureat reflux for 2 h
3. temperatureThe mixture was cooled to room temperature
4. stirringThe mixture was stirred
5. temperatureat reflux for 90 min
6. temperaturecooled in an ice bath
7. customThe ice bath was removed after 10 min
8. stirringthe reaction mixture was stirred
9. temperatureat reflux for 14 h
10. temperaturecooled
11. additiondiluted with DCE (30 mL)
12. customThe diluted reaction mixture
13. washwas washed with saturated NaHCO3 (20 mL)
14. dry with materialdried over MgSO4
15. custompurified
16. washeluting with a gradient of methanol in dichloromethane