Phosphorus oxychloride → Methyl 2-(chloromethyl)pyridine-3-carboxylate

Participants

Reaction Steps

The crude 3-(methoxycarbonyl)-2-methylpyridine-1-oxide (35 g, 210 mmol) was added in small portion to POCl3 (300 g) at room temperature. After the addition, the reaction mixture was refluxed for 3 hours before it was concentrated in vacuo. The residue was poured into ice-water, neutralized with aq. NaHCO3 solution and extracted with AcOEt (125 mL×3). The combined organic layers were washed with brine, dried over anhy. NazSO4, filtered, and concentrated in vacuo to afford a crude product which was then purified by column chromatography to give title compound (12 g, yield 30%).

Provenance & Evidence