Piperidine → tert-Butyl 7-(piperidin-1-yl)-2,3-di-p-tolyl-7,8-dihydropyrido[2,3-b]pyrazine-5(6H)-carboxylate

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Reaction Steps

tert-Butyl-7-acetoxy-2,3-di-p-tolyl-7,8-dihydropyrido[2,3-b]pyrazine-5(6H)-carboxylate (step 5)(210 mg, 0.443 mmol) was treated with piperidine (4380 μl, 44.3 mmol). The resulting pale yellow suspension was sonicated and then stirred at room temperature overnight. The resulting solution was added to water (100 ml) and extracted with DCM (×3), passing the organic extracts through a phase separating column. The filtrate was concentrated under reduced pressure and purification of the crude material by chromatography on silica eluting with 0-40% EtOAc in iso-hexane afforded the titled compound;

Provenance & Evidence