反应详情

To a suspension of (R)-5-(2-(2,5-difluorophenyl)pyrrolidin-1-yl)pyrazolo[1,5-a]pyrimidine-3-carboxylic acid (Preparation C, 25.0 mg, 0.072 mmol) in CCl4 (1.0 mL) was added thionyl chloride (0.10 mL) and the mixture heated at reflux for 4 hours. The mixture was cooled to ambient temperature and was concentrated to a brittle foam. The foam was dissolved in pyridine (2 mL), 2-amino-3-methyl-pyridine (9.3 mg, 0.086 mmol) was added and the mixture was heated at 90° C. for 20 hours. The reaction was cooled to ambient temperature and the pyridine evaporated. The residue was partitioned into 1M NaOH and EtOAc, mixed and the EtOAc layer removed. The aqueous layer was extracted with EtOAc and combined EtOAc fractions were washed with H2O, saturated NaCl and dried over MgSO4. The solution was filtered and concentrated, and the resulting solid was washed with dry Et2O to afford the title compound as a white solid (7 mg, 29%). MS (apci) m/z=435.1 (M+H).

1. temperaturethe mixture heated
2. temperatureat reflux for 4 hours
3. concentrationwas concentrated to a brittle foam
4. dissolutionThe foam was dissolved in pyridine (2 mL)
5. temperaturethe mixture was heated at 90° C. for 20 hours
6. temperatureThe reaction was cooled to ambient temperature
7. customthe pyridine evaporated
8. customThe residue was partitioned into 1M NaOH and EtOAc
9. additionmixed
10. customthe EtOAc layer removed
11. extractionThe aqueous layer was extracted with EtOAc and combined EtOAc fractions
12. washwere washed with H2O, saturated NaCl
13. dry with materialdried over MgSO4
14. filtrationThe solution was filtered
15. concentrationconcentrated
16. washthe resulting solid was washed with dry Et2O