Citric Acid → (2S)-3-ethoxy-N-(5-methylpyrazin-2-yl)-2-[1-[2-(trifluoromethyl)phenyl]pyrazolo[4,5-e]pyrimidin-4-yl]oxypropanamide

Participants

Reaction Conditions

Reaction Steps

60% Sodium hydride (60.0 mg, 1.50 mmol) was added in one portion to (S)-3-ethoxy-2-hydroxy-N-(5-methylpyrazin-2-yl)propanamide (Intermediate H1) (225 mg, 1.00 mmol) in anhydrous THF (5 mL) and the mixture was cooled to 0° C. under nitrogen. The resulting suspension was stirred at 0° C. for 10 minutes and then 4-chloro-1-(2-(trifluoromethyl)phenyl)-1H-pyrazolo[3,4-d]pyrimidine (Intermediate P1) (298.6 mg, 1.00 mmol) as suspension in dry THF (4 mL) added dropwise over 1 minute. The mixture was stirred at 0° C. for 15 mins, allowed to warm to ambient temperature and stirred for 2 hours. 1M Citric acid (2 mL) was added and the mixture extracted with ethyl acetate (2×20 mL). The organic extracts were washed with water (15 mL) and brine (15 mL), dried (MgSO4) and evaporated. The residue was purified by flash silica chromatography, eluting with 60 to 100% ethyl acetate in isohexane to give the product (440 mg, 88%).

Provenance & Evidence