One-pot synthesis of alkyl 3-cyclopropylamino-2-Ä2,4-dibromo-3-(difluoromethoxy)benzoylÜ-2-propenoate as a useful intermediate for antibacterial quinolone medicaments

摘要

The present invention relates to a new and industrially advantageous one-pot process for the preparation of alkyl 3-cyclopropyl amino-2-[2,4-dibromo-3-(difluoromethoxy) benzoyl]-2-propenoates in which R represents methyl or ethyl, which are valuable intermediates for the production of highly active antibacterial quinolone medicaments.