Triethylamine → (R)-1-(2-Amino-5-bromo-pyridin-3-ylmethyl)pyrrolidine-2-carboxylic acid methyl ester

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Reaction Steps

A suspension of 5-bromo-3-bromomethyl-pyridin-2-ylamine hydrobromide (8.00 g, 23.1 mmol) and D-proline methyl ester hydrochloride (4.53 g, 27.4 mmol) in CH3CN (100 mL) was treated with a solution of triethylamine (10.4 mL, 74.0 mmol) in CH3CN (100 mL). After stirring at room temperature for 5 h, the cloudy mixture was diluted with H2O (300 mL) and extracted with EtOAc (3×200 mL). The combined organic layers were washed with brine (100 mL), dried over Na2SO4, filtered and the solvent was removed in vacuo. Purification by flash column chromatography (silica gel, CH2Cl2/MeOH, 99:1 to 98:2) gave the title compound (6.55 g, 90%) as a colorless oil: MS (ESI) m/e 314 (M+H)+

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