LINCOSAMIDE DERIVATIVE, AND ANTIBACTERIAL AGENT COMPRISING THE SAME AS ACTIVE INGREDIENT

摘要

An objective of the present invention is to provide compounds of formula (I) or their pharmacologically acceptable salts or solvates wherein A represents aryl while R 1 represents a five- or six-membered monocyclic heterocyclic group, or A represents a four- to six-membered monocyclic heterocyclic group while R 1 represents aryl or a five- or six-membered monocyclic heterocyclic group; R 2 represents a hydrogen atom or C 1-6 alkyl; R 3 represents C 1-6 alkyl or C 3-6 cycloalkyl-C 1-4 alkyl; R 4 , R 5 , and R 6 represent a hydrogen atom; R 7 represents C 1-6 alkyl; and m is 1 to 3. The compounds are novel lincosamide derivatives that have a potent activity against resistant Streptococcus pneumoniae. Further, the compounds are usable as antimicrobial agents and are useful for preventing or treating bacterial infectious diseases.