Lithium Hydroxide → N-[5-[3-(2-chloro-4-pyrimidinyl)pyrazolo[1,5-a]pyridin-2-yl]-2-(methyloxy)phenyl]-2,6-difluorobenzamide

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Reaction Steps

A solution of N-[5-[3-(2-chloro-4-pyrimidinyl)pyrazolo[1,5-a]pyridin-2-yl]-2-(methyloxy)phenyl]-2,2,2-trifluoroacetamide (370 mg, 0.83 mmol) and 1M LiOH (4.97 ml, 4.97 mmol) in 10:1 THF:H2O (10 mL) was heated at 50° C. overnight. The reaction was washed with brine (25 mL), aqueous layer extracted with EtOAc (25 mL), organic layers combined, filtered through a cotton plug, and solvent removed by rotary evaporation. After high vacuum removal of residual solvent, the crude mixture was dissolved in THF (25 mL) and to this was added 2,6-difluorobenzoyl chloride (920 mg, 5.25 mmol). After stirring 3 h at rt, DMF (25 mL) was added to dissolve any suspended solids followed by the addition of excess polymer-bound trisamine resin. Upon overnight stirring, the amine resin was removed by vacuum filtration, rinsed with MeOH (50 mL), and filtrate concentrated under reduced pressure to afford the desired amide (410 mg, 79%) as an off-white solid. ESIMS (M+H)+=492.

Provenance & Evidence