2-Fluoro-5-formylbenzonitrile → HCID 59363799, compound

Participants

Reaction Steps

To a solution of commercially available 2-fluoro-5-formylbenzonitrile (2.49 g, 10 mmol) in dichloromethane (40 mL) was added (1-(2-isobutoxyphenyl)vinyloxy)trimethylsilane (1.49 g, 10 mmol), followed by titanium tetrachloride (1.5 eq). The reaction was stirred at room temperature for 5 hours and then heated at 40° C. for overnight. The reaction was cooled and quenched with 1 N HCl (40 mL). The mixture was stirred for 2 hours and diluted with dichloromethane/water. The organic layer was separated, dried over sodium sulfate and concentrated under reduced pressure. The residue was purified by the chromatography to give (E)-2-fluoro-5-(3-(2-isobutoxyphenyl)-3-oxoprop-1-enyl)benzonitrile as a white solid (1.60 g, 50% yield). 1H NMR (400 MHz, CDCl3): δ 7.88-7.75 (m, 2H), 7.70 (d, 1H), 7.57 (d, 1H), 7.54-7.45 (m, 2H), 7.28 (d, 1H), 7.08-6.98 (m, 2H), 3.84 (d, 2H), 2.17-2.03 (m, 1H), 1.00 (d, 6H). MS (EI) for C20H18FNO2: 268 (MH+).

Provenance & Evidence