Sodium hydride → (2S)-2-(1-(3-chloropyridin-2-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)-4-methoxy-N-(5-methylpyridin-2-yl)butanamide

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Reaction Steps

4-Chloro-1-(3-chloropyridin-2-yl)-1H-pyrazolo[3,4-d]pyrimidine (Intermediate B15) (219 mg, 0.82 mmol) was added to sodium methanesulfinate (75 mg, 0.73 mmol) and sodium hydride (38.0 mg, 0.95 mmol) in THF (5 mL) at 23° C. under nitrogen. The resulting suspension was stirred at ambient temperature for 5 minutes. (S)-2-Hydroxy-4-methoxy-N-(5-methylpyridin-2-yl)butanamide (Intermediate F1) (142 mg, 0.63 mmol) was added dropwise and the suspension was stirred at ambient temperature for a further 30 minutes. The mixture was diluted with EtOAc (50 mL), and washed sequentially with water (2×25 mL) and saturated brine (25 mL). The organic layer was dried (MgSO4) and evaporated. The residue was purified by flash silica chromatography, elution gradient 40 to 100% EtOAc in isohexane to afford (2S)-2-(1-(3-chloropyridin-2-yl)-1H-pyrazolo[3,4-d]pyrimidin-4-yloxy)-4-methoxy-N-(5-methylpyridin-2-yl)butanamide (250 mg, 87%).

Provenance & Evidence