SUBSTITUTED ISOXAZOLES AND THE USE THEREOF AS ANTIBIOTICS

摘要

Compounds of formula (I), wherein X is O, S, NH, OCO, NH-CO, NH-COO, NH-CO-NH, NH-CS or NH-CS-NH; R4 is H, (C1-C3)-alkyl optionally substituted by halogen, or a C-linked heterocyclic radical selected from several possibilities; R1 and R3 are H or F; and R2 is an N-linked or C-linked heterocyclic radical, are useful in the treatment of microbial infections in human or animal body.