反应详情

温度

70 °C

To a solution consisting of N-(2-oxo-2-phenylethyl)-2-phenylpyrimidine-5-carboxamide (Step A, 80 mg, 0.25 mmol) in POCl3 (1.0 mL) was added pyridine (2.0 mL). The solution was heated at 70° C. for six hours and was subsequently allowed to cool to room temperature. The solution was diluted with ethyl acetate (10 mL) and poured into a chilled saturated aqueous sodium bicarbonate solution (40 mL). After stirring for 15 minutes, the mixture was extracted with ethyl acetate (3×25 mL) and the combined organics were dried with anhydrous sodium sulfate, filtered, and concentrated. The residue was purified by silica gel flash chromatography (0-5% methanol in dichloromethane gradient) through a 40-g Silicycle® flash silica cartridge to afford the title compound as an off-white solid (49 mg, 65% yield); Rf 0.80 with 2% methanol in dichloromethane; 1H-NMR (300 MHz; DMSO-d6) δ 9.52 (s, 2H), 8.48 (dd, 2H), 7.99 (s, 1H), 7.94 (dd, 2H), 7.43-7.60 (m, 6H); MS (ESI+) m/z 300 (M+1); H-PGDS FPBA IC50: >20 μM.

1. temperatureto cool to room temperature
2. extractionthe mixture was extracted with ethyl acetate (3×25 mL)
3. dry with materialthe combined organics were dried with anhydrous sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated
6. customThe residue was purified by silica gel flash chromatography (0-5% methanol in dichloromethane gradient) through a 40-g Silicycle® flash silica cartridge