反应详情

To a solution of tert-butyl 3-bromo-8-oxo-5,6-dihydro-[1,2,4]triazolo[4,3-a]pyrazine-7(8H)-carboxylate (663 mg, 2.1 mmol) in DCM (21 mL) was added TFA (4.2 mL, 55 mmol). After 30 minutes, the reaction was concentrated and the residue was diluted with EtOAc, sonicated, and filtered to provide the desired product as a white solid (393 mg, 87%). MS (ESI): mass calcd. for C5H5BrN4O, 216.0; m/z found, 217.0 [M+H]+.

1. concentrationthe reaction was concentrated
2. additionthe residue was diluted with EtOAc
3. customsonicated
4. filtrationfiltered