反应详情

To a solution of 2-allyl-3-methoxy-6-nitropyridine (2.0 g, 10.3 mmol) in ethanol (34 mL) was added 10% palladium on carbon (219 mg, 2.06 mmol). The reaction was evacuated and back filled with hydrogen. This was repeated two more times. The reaction mixture was stirred under hydrogen at 1 atm for 16 h, then filtered through a pad of celite and the filter cake washed thoroughly with ethyl acetate. The filtrates were concentrated in vacuo and purified by chromatography (silica, 25 to 90% ethyl acetate in hexanes) to give 5-methoxy-6-propylpyridin-2-amine (1.41 g, 8.48 mmol, 82%) as an off white solid. 1H NMR (400 MHz, CHLOROFORM-d6) δ ppm 7.09 (d, J=8.8 Hz, 1H), 6.38 (d, J=8.8 Hz, 1H), 4.28 (br. s, 2H), 3.77 (s, 3H), 2.68 (t, J=7.9 Hz, 2H), 1.69 (m, 2H), 0.99 (t, J=7.4 Hz, 3H); MS (EI/CI) m/z: 166.8 [M+H].

1. customThe reaction was evacuated
2. additionback filled with hydrogen
3. filtrationfiltered through a pad of celite
4. washthe filter cake washed thoroughly with ethyl acetate
5. concentrationThe filtrates were concentrated in vacuo
6. custompurified by chromatography (silica, 25 to 90% ethyl acetate in hexanes)