1-Bromo-2,3-difluorobenzene → 5-(2,3-Difluorophenyl)nona-1,8-dien-5-ol

Participants

Reaction Conditions

Reaction Steps

In an oven-dried 250 mL round-bottomed flask (t=g) was added 1-Bromo-2,3-difluorobenzene (2.304 mL, 20.58 mmol) in THF (60 mL) to give a colorless solution. After cooling to −78° C., BuLi (8.23 mL, 20.58 mmol) was added dropwise via syringe. The mixture was stirred at −78° C. for 20 minutes, and nona-1,8-dien-5-one (2.37 g, 17.15 mmol) (azeotroped with dry benzene) was added dropwise via canuula (plus 6 ml THF rinse). The mixture was warmed up to room temperature over 1 hour. Quenched with water and the THF solvent was stripped off. The remaining mixture was extracted with EtOAc. The layers were separated and the organic layer was washed with brine, dried with Na2SO4, and concentrated to a yellow oil. The residue was purified by FCC up to 35% Et2O/hexane. The desired fractions were pooled and concentrated to the product as a colorless oil (2.39 g, 55.3%). 1H NMR (400 MHz, CDCl3) δ 7.30-7.22 (m, 1H), 7.10-7.03 (m, 2H), 5.82-5.70 (m, 2H), 4.97-4.85 (m, 4H), 2.20-2.00 (m, 4H), 2.00-1.75 (m, 4H).

Provenance & Evidence