2-(Tributylstannyl)pyrazine → Tert-butyl 4-[6-(6-pyrazin-2-ylpyrazolo[4,3-c]pyridin-1-yl)-2-pyridyl]piperazine-1-carboxylate

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A solution of tert-butyl 4-[6-(6-chloropyrazolo[4,3-c]pyridin-1-yl)-2-pyridyl]piperazine-1-carboxylate (40 mg, 0.096 mmol) and palladium(0)tetrakis(triphenylphosphine) (11 mg, 0.0095 mmol) in N,N-dimethylacetamide 1 mL was added (2-pyrazinyl)tributyltin (0.064 mL, 0.19 mmol). The reaction mixture heated at 150° C. for 45 min in biotage microwave. The reaction mixture was filtered through celite and concentrated. The crude product was diluted with EtOAc then washed with water. The organic layers was dried with sodium sulfate, filtered, and concentrated in vacuum. The crude product was purified by flash chromatography (EtOAc/Heptane eluted at 20% EtOAc) to give tert-butyl 4-[6-(6-pyrazin-2-ylpyrazolo[4,3-c]pyridin-1-yl)-2-pyridyl]piperazine-1-carboxylate 30 mg 67% yield.

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