反应详情

4-amino-2-(trifluoromethyl)nicotinic acid (4.4 g, 18.14 mmol) was suspended in a mixture of anhydrous DMF (100 mL) and anhydrous dichloromethane (200 mL). To this was added triethylamine (6 g, 60 mmol), followed by 1-(3,4-difluorophenyl)propan-2-amine (3.75 g, 21.90 mmol). HBTU (9.63 g, 25.4 mmol) was added and the mixture was allowed to stir at room temperature overnight. The reaction mixture was concentrated in vacuo to remove dichloromethane. The resultant DMF solution was poured into water and extracted twice with ethyl acetate. The organic layer was washed successively with 1N NaOH and water, then dried over magnesium sulfate, filtered and concentrated in vacuo to give an oil. This oil was purified by silica gel column chromatography using 20-40% acetone/hexanes as eluant to provide the product as a colorless solid (6.57 g, 55% yield). 1H NMR (400 MHz, CDCl3) δ 8.2 (d, 1H), 7.1 (m, 2H), 6.95 (m, 1H), 6.7 (d, 1H), 4.07 (m, 1H), 4.9 (bd, 2H), 4.4 (m, 1H), 2.7-2.9 (dd, 2H), 1.2 (d, 2H). MS m/z 360.2 (M+H)+.

1. concentrationThe reaction mixture was concentrated in vacuo
2. customto remove dichloromethane
3. additionThe resultant DMF solution was poured into water
4. extractionextracted twice with ethyl acetate
5. washThe organic layer was washed successively with 1N NaOH and water
6. dry with materialdried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated in vacuo
9. customto give an oil
10. customThis oil was purified by silica gel column chromatography