Diisopropylethylamine → (1-(2-Bromo-5-fluoro-3-nitropyridin-4-yl)piperidin-4-yl)(4-methylpiperazin-1-yl)methanone

Participants

Reaction Steps

A round-bottomed flask was charged with (4-methylpiperazin-1-yl)-(4-piperidyl)methanone dihydrochloride (16.45 g, 57.89 mmol) and DIPEA (23.20 g, 31.27 mL, 179.5 mmol) in NMP (160 mL). 2,4-Dibromo-5-fluoro-3-nitro-pyridine (17.36 g, 57.89 mmol) was added and the reaction mixture was stirred overnight at room temperature under a nitrogen atmosphere. Additional (4-methylpiperazin-1-yl)-(4-piperidyl)methanone dihydrochloride (1.65 g, 0.1 eq) and DIPEA (1 mL, 0.1 eq) was added and stirred at room temperature for a further 3 h. The mixture diluted with EtOAc, washed with water (3×). The aqueous layer was extracted with EtOAc (3×) and the combined organic extracts were combined, washed with brine, dried (sodium sulfate), filtered and concentrated in vacuo. The crude product was purified by chromatography (330 g SiO2, 0 to 5% MeOH (containing 10% ammonium hydroxide)/DCM) to afford product as a yellow solid (20.24 g, 81%). MS (ES+) 432.0.

Provenance & Evidence