Isopropylamine → 1-Isopropyl-6-methyl-4-oxo-1,4-dihydro-pyridine-3-carboxylic acid

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Reaction Steps

A solution of 3-dimethylaminomethylene-6-methyl-pyran-2,4-dione (preparation 3a, 10.00 g, 38.6 mmol based on 70% purity), isopropylamine (5.00 mL, 58.4 mmol) and sodium tert-butoxide (5.50 g, 57.2 mmol) in ethanol (20 mL) is heated for 18 h at 90° C. The reaction mixture is evaporated under reduced pressure, treated with water and extracted with dichloromethane. The aqueous layer is acidified with 4 N aqueous HCl and extracted with dichloromethane. The combined organic layer is washed with water, dried over Na2SO4 and evaporated under reduced pressure. Yield: 7.16 g; ESI mass spectrum: [M+H]+=196; Retention time HPLC: 0.71 min (Z002_006).

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