Hydrochloric Acid → Ethyl 5-cyano-4-methyl-6-oxo-1,6-dihydropyridine-2-carboxylate

関与物質

反応条件

反応手順

To a stirred solution of ethyl 4-ethoxy-2-oxopent-3-enoate (22.5 g, 121 mmol) and 2-cyanoacetamide (9.0 g, 107 mmol) in acetone (250 mL) was added potassium carbonate (15.8 g, 114 mmol). The reaction was refluxed (85° C. oil bath) for 10 hr (the reaction formed a thick ppt. in a deep red solution). The slurry was added to cold 1N HCl (230 mL) in ice. After stirring for 30 min. the suspension was filtered, washed with water and dried under vacuum to give the product ethyl 5-cyano-4-methyl-6-oxo-1,6-dihydropyridine-2-carboxylate (14.51 g, 70.4 mmol, 65.7% yield) as a light pink solid. 1H NMR (400 MHz, DMSO-d6) δ12.60 (br. s., 1H), 7.05 (br. s., 1H), 4.34 (q, J=7.1 Hz, 2H), 2.45 (s, 3H), 1.32 (t, J=7.1 Hz, 3H). MS(ES)+ m/e 206.8 [M+H]+.

情報源と証拠