How is Ethyl 3-amino-6-bromo-2-pyrazinecarboxylate (CAS: 612835-51-5) typically synthesized?

Ethyl 3-amino-6-bromo-2-pyrazinecarboxylate (CAS: 612835-51-5) is synthesized through a multi-step process involving the bromination of 2-pyrazinecarboxylic acid ethyl ester followed by amino substitution. Commonly, this involves using N-bromosuccinimide (NBS) as the brominating agent and an amine like ammonia or aniline as the amino source. The reaction is typically carried out in a solvent like dichloromethane or acetonitrile with a yield of around 70-80%.