1H-1,2,3-Triazole → 3,5-difluoro-2-(2H-1,2,3-triazol-2-yl)benzoic acid

Participants

Reaction Steps

Prepared according to the procedure for 2-(2H-1,2,3-triazol-2-yl)-5-(trifluoromethyl)benzoic acid (Intermediate 37a) and 2-(1H-1,2,3-triazol-1-yl)-5-(trifluoromethyl)benzoic acid (Intermediate 37b) from 2H-1,2,3-triazole (CAS number 288-36-8; 1.0 g, 10.86 mmol) and 2-bromo-3,5-difluorobenzoic acid (CAS number 651027-01-9; 1.27 g, 5.43 mmol) in 1,4-dioxane (5 ml) and water (1 ml). The crude solid was purified by using column chromatography (silica, 0-3% methanol/DCM) to afford 3,5-difluoro-2-(2H-1,2,3-triazol-2-yl)benzoic acid (Intermediate 40a). The mixed fractions were further purified by column chromatography (silica, 0-3% methanol/DCM) followed by reverse phase preparative HPLC (eluted with acetonitrile/water containing 0.1% formic acid) to afford 3,5-difluoro-2-(1H-1,2,3-triazol-1-yl)benzoic acid (Intermediate 40b).

Provenance & Evidence