Boron tribromide → HCID 68676614, compound

Participants

Reaction Conditions

Reaction Steps

A solution of 335 mg of 2-tert-butyl-8-chloro-6-(4-chloro-phenyl)-2H-[1,2,4]triazolo[4,3-a]pyrazin-3-one in 1,2-dichloroethane (10.0 mL) was treated with 2.35 g of boron tribromide and the solution was heated to 125° C. in a sealed tube. After two h, the reaction was cooled to ambient temperature and the excess boron reagent was carefully destroyed by the careful addition of water. The reaction mixture was basified with 2N NaOH to pH 9 and then acidified with sat. ammonium chloride solution. The aqueous layer was extracted with EtOAc and the organic layers were washed with sat. sodium chloride solution, dried over sodium sulfate, filtered, and concentrated to provide 8-bromo-6-(4-chloro-phenyl)-2H-[1,2,4]triazolo[4,3-a]pyrazin-3-one as a tan solid. MS (M+H+)=438.3.

Provenance & Evidence