Water → 2-[5-bromo-6-(trifluoromethyl)pyridin-3-yl]-N,N-dimethylethanamine

Temperature

105 °C

To a solution of 3-bromo-5-[(E)-2-ethoxyvinyl]-2-(trifluoromethyl)-pyridine (0.35 g, 1.18 mmol) in AcOH (9 mL) was added water (3 mL). The resulting mixture was allowed to stir overnight at 105° C. The mixture was allowed to cool to rt. Dimethylamine hydrochloride (0.96 g, 11.8 mmol) and DCM (40 mL) were added. The resulting mixture was allowed to stir for 2 h. Sodium triacetoxyborohydride (0.50 g, 2.36 mmol) was added in portions over 50 min. The resulting mixture was allowed to stir for 3 h and was then concentrated. To the residue was added saturated NaHCO3 (40 mL), and the mixture was extracted with EtOAc (2×30 mL). The organic solutions were combined, dried over Na2SO4, filtered and concentrated. The residue was purified by column chromatography to give 2-[5-bromo-6-(trifluoromethyl)pyridin-3-yl]-N,N-dimethylethanamine (0.052 g, 15%) as a solid. LCMS (AA): Rt=1.24 min, m/z=297.0 (M+H).

1. temperatureto cool to rt
2. stirringto stir for 2 h
3. stirringto stir for 3 h
4. concentrationwas then concentrated
5. additionTo the residue was added saturated NaHCO3 (40 mL)
6. extractionthe mixture was extracted with EtOAc (2×30 mL)
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated
10. customThe residue was purified by column chromatography

ORD record

ord-4e272cd398104f059c755545c0ceb835

Source dataset

uspto-grants-2012_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08268992B2