Pyrazines

Pyrazine motifs introduce a more electron-poor diazine core than many other six-membered heteroaromatics, making them useful for tuning polarity and aromatic electronics. Researchers often choose them when a lead series needs a flatter, less basic aza-aromatic unit with recognizable medicinal chemistry behavior. These compounds are relevant to screening-set expansion, ligand design, and heteroaromatic optimisation.