Oxalyl chloride → 4-(2-Fluoro-phenyl)-2-morpholin-4-yl-pyrimidine-5-carboxylic acid benzyl-isopropyl-amide

Participants

Reaction Conditions

Reaction Steps

To an ice-cooled solution of 4-(2-fluoro-phenyl)-2-morpholin-4-yl-pyrimidine-5-carboxylic acid (4.321 g, 14.25 mmol) in CH2Cl2 (100 mL) and DMF (2 drops) was added oxalyl chloride (1.5 mL, 2.21 g, 17.5 mmol) dropwise. Most solids dissolved at first, later a precipitate formed. The suspension was stirred for 1 hour at 0° C., and then allowed to warm to room temperature (all solids dissolved). The solution was concentrated to a dark oil, which crystallized upon standing. The crude acid chloride was taken up in toluene (50 mL, distilled, dried over Na2SO4) and cooled in ice. N-Isopropylbenzylamine (9.5 mL, 8.5 g, 56.8 mmol) was added. The resulting suspension was stirred at room temperature for 90 minutes, washed with water and a saturated aqueous NaCl solution, dried over Na2SO4, and concentrated. The crude product was purified by column chromatography (400 mL silica, EtOAc/heptanes 1:1). All fractions containing the product were combined and concentrated. Some of the excess amine eluted with the product. A solution of the mixture in CH2Cl2 (50 mL) was washed with a 10% aqueous citric acid solution (2×25 mL), water (25.mL), and saturated aqueous NaCl solution (25 mL), dried over Na2SO4, and concentrated to give pure 4-(2-fluoro-phenyl)-2-morpholin-4-yl-pyrimidine-5-carboxylic acid benzyl-isopropyl-amide as a yellowish foam (5.685 g, 13.08 mmol, 92%).

Provenance & Evidence