Benzyl Bromide → (R)-tert-Butyl 1-(1-benzyl-3-(2,5-difluorophenyl)-1H-1,2,4-triazol-5-yl)-2,2-dimethylpropylcarbamate

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Reaction Steps

To a stirred suspension of (R)-tert-butyl 1-(3-(2,5-difluorophenyl)-1H-1,2,4-triazol-5-yl)-2,2-dimethylpropylcarbamate (5.89 g, 16.1 mmol) and Cs2CO3 (10.5 g, 32.2 mmol) in DMF (46 mL, 0.35 M) was added benzyl bromide (2.11 mL, 17.7 mmol). Once the organic layer was separated and washed with H2O, brine, then dried over Na2SO4, filtered, and evaporated in vacuo to give (R)-tert-butyl 1-(1-benzyl-3-(2,5-difluorophenyl)-1H-1,2,4-triazol-5-yl)-2,2-dimethylpropyl-carbamate. The desired regioisomer was obtained on silica gel column (0% to 100% EtOAc in Hexanes, 3.25 g, 44.3%). The structure was verified by 1H NMR nOe experiments.

Provenance & Evidence