反应详情

N-Chloro succinimide (329 g, 2.46 mmol) was added to a solution of 2-(chloromethyl)imidazo[1,2-a]pyridine (450 mg, 2.2 mmol) in DCM (15 ml) at RT under an atmosphere of nitrogen. Stirring was continued for 2 h (reaction was monitored by TLC) upon which the reaction mixture was diluted with DCM and washed with water and brine solution. The organic layer was dried over sodium sulfate, filtered and concentrated under reduced pressure. The residue was purified by flash column chromatography using 10% ethyl acetate in n-hexane and silica gel (230-400 mesh) to afford 3-chloro-2-(chloromethyl)imidazo[1,2-a]pyridine (400 mg, 76%,) as Off-white solid. 1H NMR: 200 MHz, CDCl3: δ 8.4 (d, 1H), 7.7 (d, 1H), 7.5 (t, 1H), 7.1 (t, 1H), 4.85 (s, 2H). MS: [M+H]+: m/z=201.8. HPLC: (98.3%, Condition-A).

1. custom(reaction was monitored by TLC) upon which the reaction mixture
2. washwashed with water and brine solution
3. dry with materialThe organic layer was dried over sodium sulfate
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe residue was purified by flash column chromatography