Used as a key intermediate in the synthesis of quinolone antibiotics, particularly in the production of oxazino-fused fluoroquinolones such as ofloxacin and levofloxacin. Its structure allows for functionalization at multiple sites, enabling the construction of the fused oxazine ring system and introduction of essential moieties for enhanced antimicrobial activity. Commonly employed in pharmaceutical research and development for optimizing antibiotic efficacy against a broad spectrum of bacteria, including Gram-negative and some Gram-positive strains. Also explored in the preparation of novel heterocyclic compounds with potential biological activity.