NOVEL PYRIDONE CARBOXYLIC ACID DERIVATIVES

摘要

The present invention relates to a compound of the formula: (see fig. I) wherein is 1 or 2; R3 and R4 each represent a hydrogen atom or a lower alkyl group, with a proviso that, if n is 2, one of R3 and R4 is a hydrogen atom; R5 and R6 each represent a hydrogen atom, or a hydroxy, a lower alkoxy or an amino group which is unsubstituted or substituted by a lower alkyl group, with provisos that one of R5 and R6 is a hydrogen atom and that if n is 1 and one of R5 and R6 is an amino group, then at least one of R3 and R4 is other than hydrogen and that if n is 1, at least one of R3, R4, R5, and R6 is other than hydrogen. These compounds are useful as intermediates in preparing antibacterial compounds.