反应详情

A mixture of the above 2-methoxy-4,6-dimethyl-3-vinylpyridine (0.66 g, 4.05 mmol), 5% palladium on charcoal and ethyl alcohol (10 mL) is stirred under an atmosphere of hydrogen for 4 hr. The catalyst is removed by filtration through a pad of Hi-Flo and the filtrate is concentrated. The residue is purified by chromatography eluting with dichloromethane. Product containing fractions are combined and concentrated to afford 3-ethyl-2-methoxy-4,6-dimethylpyridine (265 mg, 22.4% yield for two steps). LC/MS: MS m/e=166 (M+H); RT 3.76 min; 1H NMR (CDCl3, δ ppm) 6.50 (1H, s), 3.90 (3H, s); 2.58 (2H, q), 2.38 (3H, s); 2.21 (3H, s), 1.07 (3H, t).

1. customThe catalyst is removed by filtration through a pad of Hi-Flo
2. concentrationthe filtrate is concentrated
3. customThe residue is purified by chromatography
4. washeluting with dichloromethane
5. additionProduct containing fractions
6. concentrationconcentrated