Sodium Carbonate → 5-[3-(Trifluoromethyl)phenyl]pyrazin-2-amine

Participants

Reaction Conditions

Reaction Steps

Into a 500-mL sealed tube purged and maintained with an inert atmosphere of nitrogen, was placed a solution of 5-bromopyrazin-2-amine (4 g, 22.99 mmol, 1.00 equiv) in 1,4-dioxane (68 mL) and methanol (23 mL), 3-(trifluoromethyl)phenylboronic acid (4.46 g, 23.48 mmol, 1.02 equiv), a solution of sodium carbonate (4.88 g, 46.04 mmol, 2.00 equiv) in water (23 mL), and Pd(PPh3)4 (532 mg, 0.46 mmol, 0.02 equiv). The resulting solution was stirred overnight at 135° C. in an oil bath. The resulting mixture was concentrated under vacuum. The residue was applied onto a silica gel column and eluted with ethyl acetate/petroleum ether (1:5). This resulted in 4.4 g (80%) of 5-(3-(trifluoromethyl)phenyl)pyrazin-2-amine as a yellow solid.

Provenance & Evidence