Acetic Acid → 6-Isopropyl-2-oxo-1,2-dihydropyridine-3-carbonitrile

Participants

Reaction Steps

To a solution of the product of Example 36A (5.35 g, 0.0393 mol) and 2-cyanoacetamide (3.47 g, 0.0413 mol) in water (35 mL) was stirred at room temperature for 10 minutes. To this mixture was added 2.5 mL of a stock piperidine acetate solution (prepared from 9.8 mL of piperidine, 6 mL of acetic acid and 10 mL of water), and the solution was heated under reflux for 2 hours. The mixture was then cooled to room temperature and taken to pH 4 by the addition of glacial acetic acid. The resulting light yellow solid was isolated by vacuum filtration, rinsed with water (2×30 mL), and dried under vacuum to provide the title product (4.36 g, 68%).

Provenance & Evidence