Toluene → 6-[2-(2,4-Difluorophenyl)ethynyl]-3-nitro-pyridin-2-amine

Participants

Reaction Conditions

Reaction Steps

6-Chloro-3-nitro-pyridin-2-ylamine (1254 g, 7.23 mol), triethylamine (1510 mL, 10.84 mol) and acetonitrile (10 L) are charged into a 20 L, 4-neck round bottom flask equipped with a mechanical stirrer under nitrogen. To the resulting yellow suspension, copper(I) iodide (13.9 g, 72.3 mmol) and bis(triphenylphosphine)palladium (II) chloride (50.72 g, 72.3 mmol) are added. The resulting pale orange suspension is cooled to 0-5° C. and then degassed during 10 min with nitrogen. A solution of 1-ethynyl-2,4-difluoro-benzene (1100 g, 7.95 mol) dissolved in acetonitrile (2.5 L) is added dropwise during 60 min. The resulting mixture is left stirring at RT (30° C.) overnight. The mixture is cooled to 0-5° C. Toluene (6 L) is added to the suspension and the mixture is stirred for 45 min and filtered though a frit. The solid is washed with toluene (3×3 L), water (2×3 L) and is dried overnight in a vacuum oven, to obtain the title compound as a yellow solid (1750 g, 92%). LC-ES/MS m/z 276 (M+1).

Provenance & Evidence