反应详情

To a solution of 2-chloro-5-aminopyridine (500 mg, 3.88 mmol) and acetone (250 μL, 4.27 mmol) in dichloroethane (13 mL) was added NaBH(OAc)3 (989 mg, 4.66 mmol) and AcOH (330 μL, 5.82 mmol). The reaction was stirred for 24 hours and was diluted with 1N NaOH. The aqueous solution was washed with CH2Cl2 (3×). The combined organic solutions were dried (Na2SO4), filtered and concentrated. Purification by medium pressure chromatography eluting with a solvent gradient (2% MeOH in CH2Cl2 to 5% MeOH in CH2Cl2) provided 505.2 mg of (6-chloro-pyridin-3-yl)-isopropyl-amine. 1H NMR (CD3OD) δ 7.64 (d, 1H), 7.10 (d, 1H), 6.99 (dd, 1H), 3.55 (m, 1H), 1.17 (d, 6H).

1. washThe aqueous solution was washed with CH2Cl2 (3×)
2. dry with materialThe combined organic solutions were dried (Na2SO4)
3. filtrationfiltered
4. concentrationconcentrated
5. customPurification by medium pressure chromatography
6. washeluting with a solvent gradient (2% MeOH in CH2Cl2 to 5% MeOH in CH2Cl2)