反应详情

温度

80 °C

To a solution of 6-bromo-N-((tetrahydro-2H-pyran-4-yl)methyl)pyridin-2-amine (20 g, 74 mmol) in acetonitrile (240 mL) was added NCS (9.85 g, 74 mmol). The mixture was heated to 80° C. for 3 hr. The reaction mixture was allowed to cool to ambient temperature and concentrated in vacuo. The resulting residue was diluted with brine (200 mL) and extracted with EtOAc (3×200 mL). The combined organic layers were concentrated in vacuo. The resulting residue was purified by column chromatography [SiO2, EtOAc/heptane=0/100 to 50/50] providing 6-bromo-5-chloro-N-((tetrahydro-2H-pyran-4-yl)methyl)pyridin-2-amine (12 g) and a mixture of 6-bromo-3,5-dichloro-N-((tetrahydro-2H-pyran-4-yl)methyl)pyridin-2-amine/6-bromo-3-chloro-N-((tetrahydro-2H-pyran-4-yl)methyl)pyridin-2-amine (5 g, ratio ˜2:3).

1. temperatureto cool to ambient temperature
2. concentrationconcentrated in vacuo
3. additionThe resulting residue was diluted with brine (200 mL)
4. extractionextracted with EtOAc (3×200 mL)
5. concentrationThe combined organic layers were concentrated in vacuo
6. customThe resulting residue was purified by column chromatography [SiO2, EtOAc/heptane=0/100 to 50/50]