FIELD: chemistry.
SUBSTANCE: application relates to a method for preparation of formula (I)
compounds or pharmaceutically acceptable salts thereof, wherein R represents H or F, and each of R3, R4 and R5 independently represents C1-C6 alkyl or hydroxyl group, as well as to intermediates and processes for their preparation.
EFFECT: compounds of formula or salts thereof inhibit bacterial gyrase or topoisomerase IV and are useful for bacterial infections treatment.
18 cl, 2 dwg, 2 ex
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