How is 2-Chloro-7-nitroquinoxaline (CAS: 55686-94-7) typically synthesized?

2-Chloro-7-nitroquinoxaline is typically synthesized by the reaction of 2-aminoquinoxaline with thionyl chloride followed by nitration with nitric acid. The reaction involves the introduction of a chlorine atom and a nitro group into the quinoxaline ring. The process requires careful control of reaction conditions to ensure high yield and selectivity.