Citric Acid → 3-Bromopyridine-2-carbaldehyde

Participants

Reaction Conditions

Reaction Steps

A suspension of 3-bromo-2-dibromomethyl-pyridine (10.0 g, 30.32 mmol) in morpholine (30.0 mL) was heated at 60° C. for 1 h. The reaction mixture was then cooled to rt and diluted with EtOAc (200 mL) followed by adjustment to pH 4 by adding citric acid (40.0 g). The reaction mixture was extracted with EtOAc (3×200 mL). The combined organic layers were dried over Na2SO4 and concentrated under reduced pressure. The resulting residue was purified by column chromatography using silica (100-200 mesh) and 3% EtOAc in hexane as eluent to give 3-bromo-pyridine-2-carbaldehyde. 1H-NMR (400 MHz, CDCl3) δ ppm 10.23 (s, 1H), 8.75 (d, 1H), 8.03 (d, 1H), 7.32 (t, 1H).

Provenance & Evidence