反应详情

A mixture of tert-butyl 6-bromopyridin-2-yl((2,2-dimethyltetrahydro-2H-pyran-4-yl)methyl)carbamate (710 mg, 1.778 mmol), 5-chloro-2-fluoropyridin-4-ylboronic acid, PdCl2(dppf).CH2Cl2 adduct (145 mg, 0.178 mmol) in DME (7 mL) and 2M aqueous Na2CO3 solution (2.3 mL, 1.778 mmol) was heated in a sealed tube at about 98° C. for 2 hr. The mixture was cooled to ambient temperature and diluted with EtOAc (˜100 mL) and saturated aqueous NaHCOs solution. The separated organic layer was washed with saturated aqueous NaHCO3 (2×), dried over Na2SO4, filtered off and concentrated in vacuo. The resulting residue was purified by column chromatography [SiO2, 40 g, 25 min, EtOAc/heptane=0/100 to 25/75over 25 min] providing (R/S)-tert-butyl 5′-chloro-2′-fluoro-2,4′-bipyridin-6-yl((2,2-dimethyltetrahydro-2H-pyran-4-yl)methyl)carbamate as a highly viscous, colorless oil. Yield: 605 mg. LCMS (m/z): 394.1 {loss of tert Bu-group}/450.2[M+H]+; Retention time=1.24 min.

1. washThe separated organic layer was washed with saturated aqueous NaHCO3 (2×)
2. dry with materialdried over Na2SO4
3. filtrationfiltered off
4. concentrationconcentrated in vacuo
5. customThe resulting residue was purified by column chromatography [SiO2, 40 g, 25 min, EtOAc/heptane=0/100 to 25/75over 25 min]