Sodium hydride → (RS)-ethoxy-(3-nitro-2-oxo-2H-pyridin-1-yl)-acetic acid ethyl ester

Participants

Reaction Conditions

Reaction Steps

Sodium hydride (60% dispersion in mineral oil, 1.228 g=0.74 g NaH) was suspended in DMF (45 ml) under an argon atmosphere. The stirred suspension was cooled to 0° C. and 2-hydroxy-3-nitropyridine (4 g) was added portion wise over a period of 45 min. The mixture containing a compact yellow precipitate was then stirred at r.t. for 30 min and was cooled again to 0C. A solution of 2-chloro-2-ethoxyacetic acid ethyl ester (4.99 g) in DMF (5 ml) was then added and stirring at r.t. was continued for 2 h 30. The mixture was diluted with EtOAc and washed with water. The aqueous phase was extracted with EtOAc. The combined organics were washed with water and brine, dried (MgSO4), filtered and concentrated. The crude product was purified by chromatography (silica gel, gradient cyclohexane=>cyclohexane/EtOAc 3:2) to give (RS)-ethoxy-(3-nitro-2-oxo-2H-pyridin-1-yl)-acetic acid ethyl ester (4.32 g) as yellow solid. MS 270.1 ([M]+)

Provenance & Evidence