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温度

0 °C

To a suspension of 1-(3-bromobenzyl)-5-methyl-1H-1,2,4-triazole-3-carboxamide (50 mg, 0.17 mmol) and Et3N (47 μL, 0.34 mmol) in DCM (2 mL) was slowly added a solution of trifluoroacetic anhydride (29 μL, 0.20 mmol) in DCM (2 mL) at 0° C. The reaction was stirred at 0° C. for 2 h, and was then warmed to RT while stirring overnight. The reaction was then quenched with H2O (3 mL) and washed with NaOH (1N, 5 mL) and brine (2×5 mL) before being concentrated under reduced pressure. The crude product was purified on a Biotage pre-packed silica gel column with a gradient of 12% to 80% EtOAc:Hexanes to afford 1-(3-bromobenzyl)-5-methyl-1H-1,2,4-triazole-3-carbonitrile (39 mg, 83%) as a viscous oil. MS (ES+) C11H9BrN4 requires: 276, 278 found: 277, 279 [M+H]+(1:1).

1. temperaturewas then warmed to RT
2. stirringwhile stirring overnight
3. customThe reaction was then quenched with H2O (3 mL)
4. washwashed with NaOH (1N, 5 mL) and brine (2×5 mL)
5. concentrationbefore being concentrated under reduced pressure
6. customThe crude product was purified on a Biotage pre-packed silica gel column with a gradient of 12% to 80% EtOAc