反应详情

A mixture of 6-bromo-3,5-dichloro-N-((tetrahydro-2H-pyran-4-yl)methyl)pyridin-2-amine (1 g, 2.94 mmol), 5-chloro-2-fluoropyridin-4-ylboronic acid (0.774 g, 4.41 mmol), PdCl2(dppf).CH2Cl2 adduct (0.240 g, 0.294 mmol) in DME (12 mL) and 2M aqueous Na2CO3 solution (4 mL, 2.94 mmol) in a sealed tube was heated at 90° C. for 2 hr. The mixture was allowed to cool to ambient temperature and was diluted with EtOAc (˜100 mL) and saturated aqueous NaHCO3. The separated organic layer was washed with saturated aqueous NaHCO3 (2×), brine, dried over Na2SO4, filtered off and concentrated in vacuo. The resulting residue was purified by column chromatography [SiO2, 80 g, EtOAc/heptane= 0/100 to 30/70 over 25 min] providing 3,5,5′-trichloro-2′-fluoro-N-((tetrahydro-2H-pyran-4-yl)methyl)-2,4′-bipyridin-6-amine as a colorless liquid. Yield: 510 mg. LCMS (m/z): 391.9 [M+H]+; Retention time=1.14 min.

1. washThe separated organic layer was washed with saturated aqueous NaHCO3 (2×), brine
2. dry with materialdried over Na2SO4
3. filtrationfiltered off
4. concentrationconcentrated in vacuo
5. customThe resulting residue was purified by column chromatography [SiO2, 80 g, EtOAc/heptane= 0/100 to 30/70 over 25 min]