反应详情

To a stirred solution of 6-(trifluoromethyl)pyridin-2-ylhydrazine (3.00 g, 16.4 mmol) and 4-fluorobenzoyl chloride (2.95 g, 18.63 mmol) in anhydrous THF (20 mL) at 0° C. under N2 was added diisopropylethylamine (2.41 g, 18.63 mmol). After 15 min, the solution was allowed to warm to room temperature over 1 h. Water (80 mL) was added, and the aqueous layer was extracted with ethyl acetate (2×100 mL). The organic extracts were combined, washed with water (100 mL), dried over MgSO4, and concentrated in vacuo to a tan solid. Recrystallization from ethyl acetate afforded the title compound of Step A as a white solid (3.16 g). 1H NMR (Me2SO-d6, 400 MHz) δ10.55 (s,1H), 9.10 (s, 1H), 8.00 (m,2H), 7.80 (t, 1H), 7.40 (t,2H), 7.15 (d, 1H), 6.90 (d, 1H).

1. extractionthe aqueous layer was extracted with ethyl acetate (2×100 mL)
2. washwashed with water (100 mL)
3. dry with materialdried over MgSO4
4. concentrationconcentrated in vacuo to a tan solid
5. customRecrystallization from ethyl acetate