Synthesis and Study of Antimicrobial Activity of Water-Soluble Ammonium Acylhydrazones Based on New 1,ω-Alkylenebis(isatins)

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Alkylation of isatin with 1,ω-dihaloalkanes afforded bis(heterocycles) connected by an oligomethylene linker. The reaction of the resulting bis(isatins) with Girard’s T and Girard’s P reagents led to the formation of symmetrical water-soluble acyl hydrazones with high yields. Evaluation of antimicrobial activity of new compounds showed the dependence of the activity level on the hydrocarbon spacer length. The selective activity of nona- and decamethylene derivatives was established with respect to gram-positive bacteria S. aureus 209p and B. cereus 8035. Low hematotoxicity of the obtained heterocycles was revealed.