4-Toluenesulfonyl chloride → 2,2-Difluoroethyl (4-methylphenyl)sulphonate

Participants

Reaction Steps

Combine p-toluenesulfonyl chloride (12.9 g, 67.4 mmol) in pyridine (15 mL) at room temperature and treat dropwise with 2,2-difluoroethanol (5.0 g, 60.9 mmol) via syringe. Stir the reaction mixture under nitrogen for 72 hours, partition between water (20 mL) and dichloromethane (20 mL). Separate the aqueous phase and extract with additional dichloromethane (2×40 mL). Combine the organic extracts and wash sequentially with 1N hydrochloric acid (2×50 mL), sodium bicarbonate (2×50 mL), and brine (2×50 mL). Dry the organic layer over sodium sulfate and concentrate in vacuo to give the title compound as a yellowish oil: 1H NMR (300 MHz, CDCl3): 7.82 (d, 2H, J=9.0 Hz), 7.40 (d, 2H, J=9.0 Hz), 5.92 (tt, 1H, J=55.0, 0.4 Hz), 4.19 (td, 2H, J=12.6, 4.0 Hz), 2.48 (s, 3H).

Provenance & Evidence