Abstract
In order to overcome butirosin-resistant microorganisms of 3'-O-phosphorylation type, 3', 4'-dideoxybutirosin A (2) was synthesized according to the method of Umezawa, et al. The synthesized 3', 4'-dideoxy derivative (2) exhibited significant activities agaisnt both butirosin-sensitive and resistant strains in vitro and in vivo and its acute toxicity was found to be at a similar level to that of butirosin.