反应详情

A 250 mL Erlenmeyer flask, immersed in a water bath at 25° C., was charged with acetone (20 mL,) and 2-fluoro-3-[(4-fluoro-2-nitrophenyl)ethynyl]pyridine (0.443 g, 0.0017 mol). To this solution was added a solution of sodium bicarbonate (0.08 g, 0.001 mol) and magnesium sulfate (0.4 g, 0.003 mol) in water (10 mL). The mixture was stirred with a mechanical stirrer. Powdered potassium permanganate (0.91 g, 0.0058 mol) was then added in one portion, and the mixture was stirred for 4 hours. The unreacted potassium permanganate and the precipitated MnO2 were reduced to soluble Mn2+ ions by adding a minimum quantity of NaNO2 (0.14 g) and 10% H2SO4 (1.4 mL) in small portions. The solution was transferred to a 250 mL separating funnel, saturated with NaCl, and extracted with ethyl acetate 2×, dried over MgSO4, concentrated and was purified by column chromatography on silica gel. (20% ethyl acetate, 80% hexanes) to give 0.45 g of the desired product. 1H NMR (400 MHz, CDCl3): δ 8.51-8.53 (m, 1H), 8.41-8.46 (m, 1H), 7.88-7.95 (m, 2H), 7.58-7.62 (m, 1H), 7.41-7.45 (m, 1H). MS [M+H]=292.9.

1. customA 250 mL Erlenmeyer flask, immersed in a water bath at 25° C.
2. stirringthe mixture was stirred for 4 hours
3. customseparating funnel
4. extractionsaturated with NaCl, and extracted with ethyl acetate 2×
5. dry with materialdried over MgSO4
6. concentrationconcentrated
7. customwas purified by column chromatography on silica gel