Cesium carbonate → rac-[1-[({2,5-Dimethyl-7-[4,4,4-trifluoro-3-(trifluoromethyl)butoxy]pyrazolo[1,5-a]pyridin-3-yl}carbonyl)amino]-2-methylpentan-2-yl}carbamic Acid tert-butyl Ester

Participants

Reaction Steps

A solution of 40 mg (0.10 mmol) of rac-[1-{[7-hydroxy-2,5-dimethylpyrazolo[1,5-a]pyridine-3-carbonyl)amino]}-1-methylbutyl)carbamic acid tert-butyl ester (Example 141A) in 1 ml of DMF was admixed with 65 mg (0.2 mmol) of caesium carbonate and 78 mg (0.3 mmol) of 4-bromo-1,1,1-trifluoro-2-(trifluoromethyl)butane (CAS: 203303-02-0). The reaction mixture was stirred at room temperature for 18 hours. The solvent was evaporated off under reduced pressure. The residue was partitioned between dichloromethane and water, the phases were separated and the organic phase was concentrated under reduced pressure, which gave 55 mg (51% yield, 54% pure) of the target compound, which was used in the next step without further purification.

Provenance & Evidence