Citric Acid → (2-Amino-5-bromo-3-pyridyl)-phenylketone

Participants

Reaction Conditions

Reaction Steps

1.00 g (3.38 mmol) of N-methoxy-N-methyl-2-amino-5-bromonicotinamide hydrochloride was suspended in 50 ml of anhydrous THF under nitrogen. The suspension was cooled to −50° C. and 13.5 ml of a 1.0 M solution of phenylmagnesium bromide in ether was added rapidly to afford an orange solution. The mixture was stirred, and slowly warmed to room temperature. The resulting yellow-orange solution was distributed between 75 ml of a 10% aqueous citric acid solution and 200 ml of ethyl acetate. The organic phase was separated and washed with 75 ml of a 10% aqueous citric acid solution and 75 ml of saturated aqueous sodium bicarbonate solution. The organic phase was then dried over sodium sulfate and evaporated to afford 985 mg of a yellow crystalline solid. 1H-NMR (d6-DMSO) δ: 8.34 [1H] d, 7.72 [2H] s, 7.70 [1H] d, 7.65 [1H] t(m), 7.63 [2H] d(m), 7.56 [2H] t(m). MS: m/z 277 [MH+].

Provenance & Evidence