反应详情

温度

0 °C

Cyclopropyl amine (11.4 mL, 165 mmol) was added to a solution of 4-(3-pyridyl)cyclohexanone (19.2 g, 110 mmol) in DCE (360 mL) and acetic acid (12.6 mL, 220 mmol). The reaction mixture was cooled to 0° C. and NaBH(OAc)3 (46 g, 220 mmol) was added protionwise. After being stirred for 21 h at 23° C., the reaction was re-cooled to 0° C. and quenched with 1 M NaOH (200 mL). The aqueous layer was extracted with CH2Cl2 (2×200 mL) and the combined organic layers were washed with brine (300 mL), dried with MgSO4, filtered, and concentrated in vacuo. The crude mixture of cis and trans amines was purified by flash column chromatography (gradient elution, 40% EtOAc/hexanes (2.5% TEA)→70% EtOAc/hexanes (2.5% TEA)) to provide trans-N-cyclopropyl-4-(pyridine-3-yl)cyclohexylamine.

1. temperaturethe reaction was re-cooled to 0° C.
2. customquenched with 1 M NaOH (200 mL)
3. extractionThe aqueous layer was extracted with CH2Cl2 (2×200 mL)
4. washthe combined organic layers were washed with brine (300 mL)
5. dry with materialdried with MgSO4
6. filtrationfiltered
7. concentrationconcentrated in vacuo
8. additionThe crude mixture of cis and trans amines
9. customwas purified by flash column chromatography (gradient elution, 40% EtOAc/hexanes (2.5% TEA)→70% EtOAc/hexanes (2.5% TEA))