| abstract |
The present invention relates to a compound of formula (1) wherein X1 represents O or NR6, X2 represents O or NR6, X3 represents O or NR1, R1 represents H or C1 to C3 alkyl, R2 represents H, or a linear or branched C1 - C8 alkyl optionally comprising one or more heteroatoms, cyclopropyl, cyclobutyl, cyclohexyl or oxetanyl or an amino acid side chain or a protected amino acid side chain, or R1 and R2 may form together a 5 or 6 membered ring system which may be saturated, partly saturated or unsaturated, said ring system being optionally substituted, R3 represents H, cyclopentyl, cyclohexyl, aryl or hydroxyaryl, said aryl or hydroxyaryl being optionally substituted by fluorine, or linear or branched C1 to C8 alkyl optionally comprising a hetero atom, R4 represents phenyl or 5- or 6-membered heterocycles comprising one or more nitrogen or oxygen atoms optionally substituted with 1 to 4, respectively 5 fluorine atoms, and R6 represents H, or a linear or branched alkyl chain having 1 to 3 carbon atoms their use as a medicament for the treatment of bacterial infections, in particular for treatment of tuberculosis. |