Abstract
N,N′-Diaryl-bishydrazones of [1,1′-biphenyl]-3,4′-dicarboxaldehyde, [1,1′-biphenyl]-4,4′-dicarboxaldehyde, and 4,4′-bisacetyl-1,1-biphenyl exhibited excellent antifungal activity against a broad spectrum of filamentous and non-filamentous fungi. These N,N′-diaryl-bishydrazones displayed no antibacterial activity in contrast to previously reported N,N′-diamidino-bishydrazones and N-amidino-N′-aryl-bishydrazones. The leading candidate, 4,4′-bis((E)-1-(2-(4-fluorophenyl)hydrazono)ethyl)-1,1′-biphenyl, displayed less hemolysis of murine red blood cells at concentrations at or below that of a control antifungal agent (voriconazole), was fungistatic in a time-kill study, and possessed no mammalian cytotoxicity and no toxicity with respect to hERG inhibition.
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