Hydrochloric Acid → HCID 58317608, compound

Participants

Reaction Steps

To a butyllithium-hexane solution (100 mL, 160 mmol) in THF (200 mL) was slowly added diisopropylamine (27.4 mL, 192 mmol) in THF (15 mL) at −78° C. The mixture was stirred at the same temperature for 15 min. A solution of 2,6-dichloro-5-fluoronicotinic acid (14.98 g, 71.4 mmol) in THF (15 mL) was added and the mixture was stirred for 2 h. Next, DMF (29.3 mL, 378 mmol) was added and the mixture was stirred for 1 h. Hydrochloric acid (1N, 400 mL) was added and the mixture was subsequently extracted with EtOAc (2×300 mL). The organic phase was basified with saturated aq NaHCO3 solution and the aqueous phase was separated. The aqueous phase was re-acidified with 1N HCl (300 mL) and extracted with EtOAc (2×300 mL). The organic phase was washed with H2O (200 mL) and brine (200 mL), dried over MgSO4, and evaporated. The residue was washed with Hexane/EtOAc (1/8) to give the title compound as a white solid (11.5 g, 67.7%). 1H NMR (500 MHz, DMSO-d6) δ ppm 6.85 (br s, 1 H), 8.82 (br s, 1 H).

Provenance & Evidence