2-Bromo-5-iodopyrazine

2-Bromo-5-iodopyrazine (CAS 622392-04-5) is a strategically bifunctional halogenated pyrazine scaffold engineered for sequential cross-coupling reactions, pharmaceutical intermediate synthesis, and materials science development. This molecule integrates an electron-deficient pyrazine core—a six-membered aromatic diazine ring with nitrogen atoms at para positions (1,4)—with a bromine substituent at the C2 position and an iodine atom at the C5 position. The dual halogen architecture with differentiated reactivity (I > Br) enables chemoselective functionalization, allowing researchers to introduce distinct substituents at each position through controlled Pd-catalyzed cross-coupling (Suzuki, Stille, Negishi, Sonogashira). The 2,5-substitution pattern creates a symmetric geometry across the ring center, while the iodine handle offers faster oxidative addition kinetics compared to the bromine site. This intermediate is particularly valuable for constructing asymmetric ligands, fused heterocycles (pyrazino-fused systems), kinase inhibitor cores, and conjugated materials where stepwise derivatization is critical. Manufactured with purity ≥98% under controlled conditions, it supports drug discovery programs requiring modular access to differentially halogenated electron-deficient heterocycles.