Sodium Carbonate → Tert-butyl 4-{2-[1-(6-methylpyridin-2-yl)piperidin-4-yl]ethyl}piperidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

2-(Dicyclohexylphosphino)biphenyl (71 mg) and (1E,4E)-1,5-diphenyl-1,4-pentadien-3-one-palladium (93 mg) were added to a toluene (10 ml) suspension of tert-butyl 4-(2-piperidin-4-ylethyl)piperidine-1-carboxylate hydrochloride (1.13 g), 2-chloro-6-methylpyridine (431 mg) and sodium tert-butoxide (487 mg), followed by stirring at 120° C. for 1 hour. The reaction liquid was left cooled, then an aqueous saturated sodium carbonate solution was added thereto, followed by extraction with EtOAc. The organic layer was washed with saturated brine and dried over anhydrous magnesium sulfate. Then, the solvent was evaporated and the residue was purified by silica gel column chromatography (eluent: hexane:EtOAc=10:1 (v/v)) to obtain tert-butyl 4-{2-[1-(6-methylpyridin-2-yl)piperidin-4-yl]ethyl}piperidine-1-carboxylate (660 mg) as a red oil.

Provenance & Evidence