2-Bromopyridine → (S)-tert-butyl 2-methyl-4-(pyridin-2-yl)piperazine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl (2S)-2-methylpiperazine-1-carboxylate (8 g, 39.94 mmol) in DMSO (25 ml) was added 2-bromopyridine (6.594 g, 41.74 mmol), and DIEA (15.48 g, 119.78 mmol). After stirring 2 days at 120° C., the resulting solution was quenched by the addition of DCM (200 ml), washed with water (3×300 ml), dried over anhydrous magnesium sulfate and concentrated under reduced pressure to afford a residue, which was purified via silica gel chromatography (3% ethyl acetate in petroleum ether) to afford (S)-tert-butyl 2-methyl-4-(pyridin-2-yl)piperazine-1-carboxylate as a red oil (5.2 g, 47%).

Provenance & Evidence