Triethyloxonium tetrafluoroborate → HCID 90308796, compound

Participants

Reaction Steps

Triethyl oxonium tetrafluoroborate (2.5 g) was added to a solution of 5-bromo-7-chloro-1H-indazole (1.38 g) in ethyl acetate (15 mL), and the reaction solution was stirred at room temperature overnight. After dilution with ethyl acetate, the reaction solution was washed successively with water and a saturated saline solution, dried over anhydrous sodium sulfate, and the solvent was evaporated under vacuum. The resultant residue was purified by column chromatography on silica gel (developing solvent:hexane/ethyl acetate) to obtain 5-bromo-7-chloro-2-ethyl-2H-indazole.

Provenance & Evidence