Trifluoroacetic acid → 3-ethyl-6-fluoro-1-(tetrahydro-2H-pyran-4-yl)-1H-pyrazolo[3,4-b]pyridine

Temperature

75 °C

A mixture of tert-butyl 2-(tetrahydro-2H-pyran-4-yl)hydrazinecarboxylate (3.8 g, 0.018 mol) and trifluoroacetic acid (20 mL, 0.3 mol) were stirred in dichloromethane (20 mL) for 90 minutes. The mixture was concentrated, and the residue was taken up in acetonitrile (30 mL). 1-(2,6-difluoropyridin-3-yl)propan-1-one (2.34 g, 0.0137 mol) was then added, and the resulting mixture was stirred at 75° C. for 72 hours. After cooling to room temperature, the mixture was concentrated, and the residue was purified by flash chromatography on silica gel using a 10-50% hexane:ethyl acetate gradient (flow rate 20 mL/min). The organics were combined and the crude product was then extracted with ethyl acetate. The combined extracts were washed with saturated sodium bicarbonate and then concentrated to afford 2.86 g (83.9%) of 3-ethyl-6-fluoro-1-(tetrahydro-2H-pyran-4-yl)-1H-pyrazolo[3,4-b]pyridine as a white solid. LC/MS (EI) tR 3.5 (Method E), m/z 250 (M++1).

1. concentrationThe mixture was concentrated
2. temperatureAfter cooling to room temperature
3. concentrationthe mixture was concentrated
4. customthe residue was purified by flash chromatography on silica gel using a 10-50% hexane
5. extractionthe crude product was then extracted with ethyl acetate
6. washThe combined extracts were washed with saturated sodium bicarbonate
7. concentrationconcentrated

ORD record

ord-08096a1c736b44bdbd5a407a8a0f56ed

Source dataset

uspto-grants-2010_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07723348B2