2-Fluorobenzoyl chloride → HCID 15728739, compound

Participants

Reaction Conditions

Reaction Steps

To 3-thiophenecarboxaldehyde dimethylacetal (50.6 g) and ether (500 ml) was added n-butyllithium (132 ml, 2.5M in hexanes) at a rate so as to maintain gentle reflux of the mixture. The reaction mixture was heated at reflux an additional 30 mins, diluted with tetrahydrofuran (600 ml), and cooled to 0° C. A solution of 2-fluorobenzoyl chloride (44.0 ml, 368 mmol) and tetrahydrofuran (500 ml), precooled to -78° C., was added with stirring. The mixture was stirred at -78° C. for 1 hr and then allowed to warm to room temperature overnight. Dilute aqueous ammonium chloride solution and ether were added and the layers were separated. The organic layer was washed with dilute aqueous sodium bicarbonate solution, and the combined aqueous layers were back-extracted with ether. The combined organic layers were washed with brine, dried over anhydrous potassium carbonate, filtered, and concentrated to give 2-(2-fluorobenzoyl)-3-thiophenecarboxaldehyde dimethylacetal.

Provenance & Evidence