反应详情

温度

-5 °C

5-(trifluoromethyl)pyridin-2-amine (15 g, 92.5 mmole) was taken up in DCM (190 ml) under nitrogen and NEt3 (16 ml, 115.7 mmole) was added. The solution was cooled to −5° C., a solution of trimethyl acetyl chloride (12.5 ml, 101.8 mmole) in DCM (65 ml) was added dropwise, and the mixture was stirred for a further 15 minutes in an ice bath. The mixture was then stirred for 2 hours at RT. The suspension was washed with H2O (150 ml), then with dilute NaHCO3 solution, and the organic phase was dried over MgSO4. After filtering off the drying agent and removing the solvent on a rotary evaporator the residue was crystallised. N-(5-(trifluoromethyl)pyridin-2-yl)pivalamide (20.8 g, 91) was obtained.

1. stirringThe mixture was then stirred for 2 hours at RT
2. washThe suspension was washed with H2O (150 ml)
3. dry with materialwith dilute NaHCO3 solution, and the organic phase was dried over MgSO4
4. filtrationAfter filtering off the drying agent
5. customremoving the solvent
6. customon a rotary evaporator the residue
7. customwas crystallised