tert-Butyl piperazine-1-carboxylate → (8-Methyl-4-quinolyl)piperazine

Participants

Reaction Conditions

Reaction Steps

8-Methyl-4-chloroquinoline (355 mg, 2 mmol) was suspended in dipropyleneglycolmonomethylether (4 ml), a solution of tert-butyl piperazine-1-carboxylate (440 mg, 2.4 mmol) in dipropyleneglycolmonomethylether (4 ml) was added and the mixture was stirred at 140° C. overnight and the solvent was evaporated under reduced pressure. The residue was dissolved in a mixture of dichloromethane and trifluoroacetic acid (1:1, 4 ml) and stirred at room temperature for 90 minutes. The mixture was evaporated to dryness under reduced pressure and the residue was dissolved in dichloromethane. The solution was washed with 5% sodium bicarbonate solution and water, dried over sodium sulfate and evaporated to dryness under reduced pressure. The residue was purified by column chromatography (prepacked silica column, gradient ethyl acetate/methanol with the addition of 1% ammonia) to yield 364 mg of a solid (1.6 mmol, 80%). MS (APCI): m/z=227.9 [M+1]+.

Provenance & Evidence