反应详情

Ti(OEt)4 (15 mL) was added to a solution of 2-(2-chloro-pyridine-4-carbonyl)-6-fluoro-benzonitrile (3.6 g, 13.81 mmol) and 2-methyl-propane-2-sulfinic acid amide (2.5 g, 20.72 mmol) in dry THF (100 mL) at room temperature. The resulting mixture was stirred to reflux for 40 hours and then treated with CH3OH (50 mL) and saturated sodium bicarbonate solution (10 mL). The resulting suspension was filtered through a pad of Celite® and the solids were washed with THF (50 mL) and CH3OH (20 mL). The filtrate was concentrated under reduced pressure and the residue was purified by flash column chromatography using a gradient of 25-50% EtOAc in hexane to afford the title compound (2.4 g, 48%).

1. temperatureto reflux for 40 hours
2. filtrationThe resulting suspension was filtered through a pad of Celite®
3. washthe solids were washed with THF (50 mL) and CH3OH (20 mL)
4. concentrationThe filtrate was concentrated under reduced pressure
5. customthe residue was purified by flash column chromatography