Iodopentafluoroethane → 1-Bromo-4-(pentafluoroethyl)benzene

1-(4-Pentafluoroethyl-phenyl)-3-p-tolyl-1H-[1,2,4]triazole. Pentafluoroethyl iodide (521 mg, 2.12 mmol) was condensed into a vial containing 1-bromo-4-iodobenzene (300 mg, 1.06 mmol), copper(0) powder (135 mg, 2.12 mmol), and DMSO (5 mL). The vial was then sealed and subjected to microwave irradiation at 150° C. for 60 min. GC-MS proved consumption of the starting material yielding both 1-bromo-4-pentafluoroethylbenzene and 1-iodo-4-pentafluoroethylbenzene intermediates. The mixture (1.06 mmol) was transferred to a 250 mL round bottom flask and 3-p-tolyl-1H-[1,2,4]triazole (169 mg, 1.06 mmol), Cs2CO3 (1.38 g, 4.24 mmol), CuI (202 mg, 1.06 mmol), 8-hydroxyquinoline (2 mg, 0.011 mmol), and DMF/H2O (12 mL; 10:1 solution) were added. The solution was stirred at reflux at 160° C. for 6 h. Upon completion, the cooled contents were poured into H2O and precipitation was allowed for 1 h. The precipitate was collected by vacuum filtration and dried overnight in a 45° C. vacuum oven. The crude 1-(4-pentafluoroethylphenyl)-3-p-tolyl-1H-[1,2,4]triazole intermediate was used in step 2 without further purification.

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ORD record

ord-6fc0d1e3f4b745febc4277485952c9ef

Source dataset

uspto-grants-2014_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08674109B2