tert-Butyl 4-ethynylpiperidine-1-carboxylate → HCID 90412447, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of N-(4-chloro-5-fluoro-3-iodopyridin-2-yl)pivalamide (1 g, 2.80 mmol), tert-butyl 4-ethynylpiperidine-1-carboxylate (0.880 g, 4.21 mmol), copper(I) iodide (0.053 g, 0.28 mmol), and bis(triphenylphosphine)palladium(II) dichloride (0.197 g, 0.280 mmol) in 50 mL tetrahydrofuran was degassed with nitrogen. The mixture was stirred at room temperature for 48 hours and at 50° C. for 8 hours. The mixture was filtered and the filtrate was diluted with water and extracted with ethyl acetate. The organic phase was washed with brine, dried over sodium sulfate, filtered and concentrated. The residue was purified by silica-gel column chromatography eluting with 0-40% ethyl acetate in heptane to afford the title compound. MS (ESI(+)) m/e 438 (M+H)+.

Provenance & Evidence