Pyridine → N-[2-(5-formyl-2,4-dimethoxyphenylethynyl)phenyl]acetamide

Participants

Reaction Conditions

Reaction Steps

Pyridine (453 μL, 5.61 mmol) was added to a suspension of 5-(2-amino-phenylethynyl)-2,4-dimethoxybenzaldehyde (Ex-35C, 750 mg, 2.67 mmol) in anhydrous methylene chloride (20 mL) and chilled to 0° C. The reaction mixture was treated dropwise with acetyl chloride (9.25 mL, 75.1 mmol). Upon completion the reaction was quenched with IN HCl (10 mL) and the layers were separated. The organic layer was washed with brine, dried over sodium sulfate, and concentrated to dryness. The crude solid was purified by silica gel chromatography (5% MeOH/CH2Cl2) to yield 671 mg (78%) of N-[2-(5-formyl-2,4-dimethoxyphenylethynyl)phenyl]acetamide as an off-white solid. 1H-NMR (300 MHz, DMSO-d6) 10.15 (s, 1H), 9.23 (br s, 1H), 7.82 (m, 2H), 7.80 (s, 1H), 7.50 (dd, 1H, J=0.9, 7.8 Hz), 7.35 (dt, 1H, J=1.8, 9.3 Hz), 7.12 (t, 1H, J=7.8 Hz), 6.82 (s, 1H), 4.00 (s, 3.99 (s, 3H), 2.10 (s, 3H).

Provenance & Evidence