Synthesis, Characterization and Antimicrobial Activities of Pentacyclic Oxadiazadiborinanes

In this study we have expanded upon a family of substituted pentacyclic oxadiazadiborinane derivatives from the condensation of carbohydrazide with ortho-formylphenyl boronic acid derivatives containing a variety of chemical and physical properties. All new complexes have been characterized fully including two single crystal X-ray diffraction studies which confirm the solid-state structure of these species along with an unusual methanol activation product, which appears to be a minor solid-state side product. The lack of inherent solubility of these compounds in common physiological media precluded us from doing traditional antimicrobial activities. To circumvent this problem, we incorporated these boron compounds into chitosan films. Only weak or moderate activities against Gram-negative and Gram-positive bacteria were observed in this study.