Potassium Carbonate → 8-bromo-7-chloro-2-((6-(trifluoromethyl)pyridin-3-yl)methyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one

Participants

Reaction Conditions

Reaction Steps

To a solution of 8-bromo-7-chloro-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one (515 mg, 2.258 mmol) in anhydrous DMF (10 mL) was added 5-(chloromethyl)-2-(trifluoromethyl)pyridine (883 mg, 4.518 mmol), followed by solid potassium carbonate (624 mg, 4.518 mmol). The resulting suspension was stirred under argon at 80° C. for 1.5 h. After cooling to room temperature, the reaction mixture was partitioned between EtOAc and water, and the aqueous layer was extracted with EtOAc twice. The combined EtOAc extracts were washed with water, then saturated aqueous NaCl, dried over Na2SO4, and evaporated under reduced pressure to provide crude product as a brown solid. The crude product was purified by silica gel (40 g) column chromatography eluting with a gradient of EtOAc (0-60%) in hexanes to obtain the title compound as a beige solid (742 mg, 81%). HPLC/MS: retention time=3.17 min, [M+H]+=407. See 7,8-bis(4-chlorophenyl)-2-((6-(trifluoromethyl)pyridin-3-yl)methyl)-[1,2,4]triazolo[4,3-a]pyridin-3(2H)-one for data addressing the question of N vs. O-alkylation.

Provenance & Evidence