N-bromobutanimide → Methyl 6-(bromomethyl)pyridine-2-carboxylate

Beteiligte Stoffe

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6-Bromomethyl-pyridine-2-carboxylic acid methyl ester was prepared according to Wells, G. J. et al. (WO 94/11398): A mixture of 6-methyl-pyridine-2-carboxylic acid methyl ester (6.5 g, 43.0 mmol), benzoyl peroxide (25 mg, 0.1 mmol) and NBS (8.5 g, 47.8 mmol) in carbon tetrachloride (250 mL) was heated at reflux overnight. The reaction mixture was cooled to room temperature, filtered, evaporated, and purified by chromatography on flash silica gel, eluting with 15% ethyl acetate/hexane to give 6-bromomethyl-pyridine-2-carboxylic acid methyl ester (2.0 g, 20%) as a white solid. 1HNMR (CDCl3): δ 8.06 (d, J=8.0 Hz, 1H), 7.87 (dd, J=8.0 Hz, 1H), 7.70 (d, J=8.0 Hz, 1H), 4.65 (s, 2H), 4.02 (s, 3H). MS (APCI+): 231 (45), 235 (42).

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