Domino-reactions of 1,2-benzoxathiin-4(3H)-one 2,2-dioxide, hetarenecarbaldehydes and active methylene nitriles in the construction of new 2-amino-4H-pyrans and the study of their antimicrobial properties

G. V. Grygoriv, D. A. Lega, V. P. Chernykh, T. P. Osolodchenko, L. A. Shemchuk

Abstract


Multicomponent domino reactions are an effective modern approach in the synthesis of different types of organic compounds, including biologically active pyrans.
Aim. To study the three-component interaction of 1,2-benzoxathiin-4(3H)-one 2,2-dioxide with different hetarenecarbaldehydes and active methylene nitriles in order to synthesize new 2-amino-4H-pyran derivatives, as well as the antimicrobial activity of the compounds obtained.
Results and discussion. 2-Amino-4-heteryl-4,6-dihydropyrano[3,2-c][2,1]benzoxathiin-3-carbonitrile 5,5-dioxides were obtained by stepwise and multicomponent reactions of 1,2-benzoxathiin-4(3H)-one 2,2-dioxide with hetarenecarbaldehydes and malononitrile. For the same interaction with ethyl cyanoacetate the reaction selectivity decreased and not only target ethyl 2-amino-4H-pyran-3-carboxylates were obtained, but also triethylammonium salts of bis(1,2-benzoxathiin-2,2-dioxo-4-ol-3-yl)(heteryl)methane. The latter were also purposefully synthesized by the two-component reaction of 1,2-benzoxathiin-4(3H)-one 2,2-dioxide with hetarenecarbaldehydes in the presence of triethylamine. The compounds obtained revealed a higher antimicrobial activity against gram-positive bacteria and fungi compared to the reference drugs.
Experimental part. 3-Amino-4-heteryl-4,6-dihydropyrano[3,2-c][2,1]benzoxathiin-3-carbonitrile 5,5-dioxides and triethylammonium 3-[1-(4-hydroxy-2,2-dioxido-1,2-benzoxathiin-3-yl)heteryl]-1,2-benzoxathiin-4-olate 2,2-dioxides were synthesized. The antimicrobial activity of the compounds synthesized was studied by the agar diffusion method.
Conclusions. It has been proven that the multicomponent format for the three-component interaction of 1,2-benzoxathiin-4(3H)-one 2,2-dioxide with hetarenecarbaldehydes and active methylene nitriles is more favorable and convenient than the stepwise approach to obtain new derivatives of 2-amino-4H-pyrans. Triethylammonium 3-[(4-hydroxy-2,2-dioxido-2,1-benzoxathiin-3-yl)heteryl]-2,1-benzoxathiin-5-olate 2,2-dioxides have been also synthesized. The antimicrobial properties of the compounds obtained are higher than in the reference drugs, especially against gram-positive bacteria and fungi.


Keywords


1,2-benzoxathiin-4(3H)-one 2,2-dioxide; domino reactions; 2-amino-4H-pyran; triethylammonium salt; antimicrobial activity

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References


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DOI: https://doi.org/10.24959/ophcj.18.931

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