Carboxyhydrazides of the aglycone of teicoplanin. Synthesis and antibacterial activity.

The condensation of the terminal carboxyl group of the deglucoteicoplanin (TD) with various substituted hydrazines produced hydrazide derivatives having different physico-chemical properties. This chemical modification of the carboxyl function does not affect the ability of teicoplanin antibiotics to interfere in bacterial cell-wall synthesis. The antibacterial activity of deglucoteicoplanin hydrazides (V) were found to depend mostly on their ionic character. All the hydrazides were slightly more active than TD on Escherichia coli. Those possessing an additional basic group were more in vitro active than TD against Gram-negative microorganisms. In Experimental Streptococcus pyogenes septicemia in the mouse, basic hydrazides were more active than other derivatives when administered subcutaneously although they are as potent as TD.