Bromine → 3-(4-Bromophenyl)-1-methyl-4,5-dihydro-1H-1,2,4-triazol-5-one

Participants

Reaction Conditions

Reaction Steps

To a solution of compound 10a (5.80 g, 22.6 mmol) in AcOH (20 mL), was added Br2 (7.30 g, 45.7 mmol) dropwise. The reaction mixture was stirred at 95° C. for 30 min. After cooling to rt, the product was precipitated by addition of Et2O and collected by filtration and washed with Et2O to obtain compound 10b as a yellow solid (5.50 g, 96% yield). Mass Spectrum (LCMS, ESI pos.): Calcd. for C9H8BrN3O: 254.0 (M+H). Found 254.1.

Provenance & Evidence