Cycloalkanecarbaldehydes in synthesis of novel 1,2-benzoxathiin-4(3H)-on 2,2-dioxide derivatives and study of the antimicrobial activity of synthesized compounds

摘要

Purpose: This paper is dedicated to the investigation of cycloalkanecarbaldehydes, 1,2-benzoxathiin-4(3H)-on 2,2-dioxide and active methylene nitriles interaction and to studying antimicrobial properties of the obtained compounds.Methods: As initial products were used cycloalkanecarbaldehydes 1,2-benzoxathiin-4(3H)-on 2,2-dioxide and active methylene nitriles. During the course of the research were applied the methods of organic synthesis. The structures of the obtained compounds were confirmed by elemental analysis and 1H NMR spectroscopy. The antimicrobial activity was measured with the agar “well” diffusion method.Results: New 2-amino-4H-pyrans were synthesized by three-component reaction of cycloalkanecarbaldehydes, 1,2-benzoxathiin-4(3H)-on 2,2-dioxide and malononitrile. The replacement of the latter with ethylcyanoacetate in the case of cyclohexanecarbaldehyde led to the isolation of triethylammonium3-[(4-hydroxy-2,2-dioxido-2,1-benzoxathiin-3-yl)(cyclohexyl)methyl]-2,1-benzoxathiin-5-olat 2,2-dioxide. Based on this result and considering originality of such ammonium salts the latter were purposefully synthesized with two-component approach using a range of secondary and tertiary amines. The synthesized compounds demonstrated higher antimicrobial activity than the reference drugs against the gram-positive strains.Conclusions: The current research showed the prospective pathway for the expanding of the existing 2-amino-4H-pyrans diversity by utilizing in their synthesis such enolnucleophile and carbonyl compounds as 1,2-benzoxathiin-4(3H)-one 2,2-dioxide and cycloalkanecarbaldehydes respectively. The revealed antimicrobial activity of the obtained compounds against gram-positive microorganisms gives the opportunity for further investigations of narrow spectrum antibiotics among this group