Trimethylsilyldiazomethane → Methyl 2-(5-bromopyridin-3-yl)acetate

Participants

Reaction Steps

To a cooled (0° C.) solution of (5-bromo-3-pyridinyl)acetic acid (1.00 g, 4.63 mmol) in diethyl ether (17 mL) and methanol (11 mL) was added a solution of (trimethylsilyl)diazomethane in diethyl ether (2.0 M, 4.6 ml, 9.3 mmol). The reaction was warmed to room temperature and then quenched by the dropwise addition of acetic acid. Once gas evolution ceased, the solution was concentrated under reduced pressure. The resulting material was diluted with ethyl acetate and washed with water and saturated aqueous sodium chloride solution. The organic layers were combined, dried over sodium sulfate, filtered and concentrated under reduced pressure. Purification by flash chromatography on silica gel (20-80% ethyl acetate in hexanes) provided the title compound: LCMS m/z 231.66 [M+2+H]+; 1H NMR (500 MHz, CD3OD) δ 7.01 (s, 1H), 6.88 (s, 1H), 6.45 (s, 1H), 2.21 (s, 2H), 2.17 (s, 3H).

Provenance & Evidence