反应详情

温度

72 °C

2-Fluoro-4-[7-(quinolin-6-ylmethyl)imidazo[1,2-b][1,2,4]triazin-2-yl]benzoic acid dihydrochloride (14, 50.00 g, 0.1059 mol) was added toluene (300 mL) and followed by thionyl chloride (SOCl2, 77.2 mL, 1.06 mol, 10.0 equiv) at room temperature. The resulting reaction mixture was heated at 72° C. under N2 and the reaction was followed by HPLC analysis of the disappearance of the starting material benzoic acid (14). After 48 h, HPLC indicated ˜4% starting material remaining and the reaction was stopped. The reaction mixture was concentrated to dryness by vacuum distillation at 40-50° C. The residual solids were added toluene (300 mL) and the solvent was removed by vacuum distillation at 40-50° C. THF (250 mL) was added and the mixture was cooled with an ice-water bath. A 2.0 M of methylamine (MeNH2) in THF (529 mL, 1.06 mol, 10 equiv) was added dropwise. The resulting reaction mixture was allowed to warm up to room temperature and stirred at room temperature for 17 h. Water (600 mL) was added to the reaction mixture and THF (400-500 mL) was removed by vacuum distillation at 40° C. Sodium carbonate (15.60 g, 0.147 mol) was added and the mixture was stirred at room temperature for 30 min. The mixture was filtered and the solid was washed with water (3×30 mL) and dried. The solid was dissolved in pre-mixed methylene chloride (CH2Cl2, 1000 mL) and methanol (MeOH, 300 mL). With vigorous stirring, a solution of 0.236 M of sodium carbonate (Na2CO3) in water (1000 mL) was added dropwise. Solid was slowly precipitated out after addition of aqueous solution of sodium carbonate (Na2CO3). Hexane (1000 mL) was then added dropwise with stirring. The mixture was stirred at room temperature for 30-40 min and the solids were collected by filtration. The solids collected were washed with water (3×200 mL) and dried in vacuum at 40-50° C. to constant weight to afford 2-fluoro-N-methyl-4-(7-(quinolin-6-ylmethyl)imidazo[1,2-b][1,2,4]triazin-2-yl)benzamide (15, 42.2 g, 43.67 g theoretical, 96.6% yield) as a bright yellow solid, which was found to be identical to the material made by Method A in every comparable aspect. For 15: 1H NMR (400 MHz, DMSO-d6) δ ppm 9.20 (s, 1H), 8.82 (dd, 1H, J=4.05, 1.56 Hz), 8.38 (br m, 1H), 8.27 (dd, 1H, J=8.50 Hz, 1.25 Hz), 8.06-7.93 (m, 5H), 7.81-7.74 (m, 2H), 7.49 (dd, 1H, J=8.40 Hz, 4.35 Hz), 4.62 (s, 2H), 2.78 (d, 3H, J=4.36 Hz); C23H17FN6O (MW 412.42), LCMS (EI) m/e 413.1 (M++H).

1. customThe resulting reaction mixture
2. concentrationThe reaction mixture was concentrated to dryness by vacuum distillation at 40-50° C
3. additionThe residual solids were added toluene (300 mL)
4. customthe solvent was removed by vacuum distillation at 40-50° C
5. additionTHF (250 mL) was added
6. temperaturethe mixture was cooled with an ice-water bath
7. customThe resulting reaction mixture
8. temperatureto warm up to room temperature
9. customwas removed by vacuum distillation at 40° C
10. stirringthe mixture was stirred at room temperature for 30 min
11. filtrationThe mixture was filtered
12. washthe solid was washed with water (3×30 mL)
13. customdried
14. dissolutionThe solid was dissolved in pre-mixed methylene chloride (CH2Cl2, 1000 mL)
15. additionWith vigorous stirring, a solution of 0.236 M of sodium carbonate (Na2CO3) in water (1000 mL) was added dropwise
16. customSolid was slowly precipitated out
17. additionafter addition of aqueous solution of sodium carbonate (Na2CO3)
18. additionHexane (1000 mL) was then added dropwise
19. stirringwith stirring
20. stirringThe mixture was stirred at room temperature for 30-40 min
21. filtrationthe solids were collected by filtration
22. customThe solids collected
23. washwere washed with water (3×200 mL)
24. customdried in vacuum at 40-50° C. to constant weight