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In an autoclave, <strong>[72716-80-4]5,6-dimethyl-2-oxo-1,2-dihydropyridine-3-carbonitrile</strong> (43.0g, 0.29mol) and 6N sodium hydroxide solution (200mL, 1.20mol) the mixture was heated to 145 within 4h. After completion of the reaction with concentrated hydrochloric acid and the reaction mixture was adjusted to pH4-2, while cooled with ice bath, a solid precipitated. The latter was filtered off with suction, washed with water and dried under reduced pressure at 2h at 55 . To give (68% of theory) of a colorless solid 34.8g.