Pyridine → HCID 59544195, compound

Participants

Reaction Steps

4-Fluoro-N-(4-methoxyphenyl)aniline (1c) (90.78 g, 0.418 mol) and 3-fluoro-4-methoxybenzoyl chloride (94.55 g, 0.501 mol) were mixed together and dissolved in anhydrous THF (200 mL) in a dry 1 L three-necked round-bottomed flask fitted with a stifling bar, a reflux condenser and an argon inlet. Anhydrous pyridine (132.22 g, 1.672 mol) was added via a syringe at room temperature under argon. The reaction mixture was stirred and heated to reflux overnight. Then, the reaction mixture was cooled to room temperature and filtered to remove pyridine salt. The solution was concentrated to remove THF solvent. The residue oil was washed with 200 mL of 2N HCl solution and extracted with ethyl acetate (2×200 mL). The combined organic layer was washed with a saturated aqueous Na2CO3 solution (150 mL) to remove excess benzoyl chloride and acid, dried over MgSO4 (50 g), filtered, and concentrated under reduced pressure to give an oil. The residue was purified by flash column chromatography using silica-gel with CH2Cl2/acetone (50/1 v/v) to afford the pure corresponding benzamide compound as a yellow solid. M.p. 54-56° C. MS (ESI) m/z 370.1 [M+H]+, 1H NMR (CDCl3/TMS) δ 7.24-7.11 (m, 4H), 7.05-6.97 (m, 4H), 6.85-6.78 (m, 3H), 3.86 (s, 3H), 3.79 (s, 3H).

Provenance & Evidence