Zigmuntas Jonas Beresnevičius

The synthesis of azole derivatives from 3-[(4-methylphenyl)amino]propanehydrazide and its N′-phenylcarbamoyl derivatives, and their antibacterial activity

Abstract5-[2-[(4-Methylphenyl)amino]ethyl]-1,3,4-oxadiazol-2(3H)-thione, 5-[2-[(4-methylphenyl)amino]ethyl]-1,3,4-oxadiazol-2(3H)-one, N-(2,5-dimethyl-1H-pyrrol-1-yl)-3-[(4-methylphenyl)amino]propanamide, and a series of N-[(phenylcarbamoyl)amino]-3-[(4-methylphenyl)amino]propanamides and 3-[(4-methylphenyl)(phenylcarbamoyl)amino]-N-[(phenylcarbamoyl)amino]propanamides, and their thio analogues were synthesized from 3-[(4-methylphenyl)amino]propanehydrazide. 1,3,4-Oxadiazole-2(3H)-thione was converted to 4-amino-2,4-dihydro-5-[2-[(4-methylphenyl)amino]ethyl]-3H-1,2,4-triazole-3-thione, whereas cyclization of N′-phenylcarbamoyl derivatives provided thiazole, oxadiazoles, and thiadiazole, as well as triazole derivatives. Two of the synthesized compounds exhibited good antibacterial activity against Rhizobium radiobacter.Graphical abstract

13C NMR Study of Dihydropyrimidinedione and Dihydropyrimidine‐2‐thione Derivatives

The 13C NMR spectral data for 18 dihydropyrimidinediones and their 2‐thio analogues are presented. The influence of substituents on the shielding of neighbouring atoms was analysed and the resonances were unambiguously assigned. 13C NMR spectroscopy was shown to be useful for structural determination of dihydropyrimidinediones and thioanalogues and allowed the facile distinction of otherwise similar compounds from the two classes.

4-Amino-substituted Benzenesulfonamides as Inhibitors of Human Carbonic Anhydrases

A series of N-aryl-β-alanine derivatives and diazobenzenesulfonamides containing aliphatic rings were designed, synthesized, and their binding to carbonic anhydrases (CA) I, II, VI, VII, XII, and XIII was studied by the fluorescent thermal shift assay and isothermal titration calorimetry. The results showed that 4-substituted diazobenzenesulfonamides were more potent CA binders than N-aryl-β-alanine derivatives. Most of the N-aryl-β-alanine derivatives showed better affinity for CA II while diazobenzenesulfonamides possessed nanomolar affinities towards CA I isozyme. X-ray crystallographic structures showed the modes of binding of both compound groups.

The synthesis of S-substituted derivatives of 3-[2-[(4-methylphenyl)amino]ethyl]-4-phenyl-4,5-dihydro-1H-1,2,4-triazole-5-thiones and their antioxidative activity

A series of novel S-substituted derivatives of 3-[2-[(4-methylphenyl)amino]ethyl]-4-phenyl-4,5-dihydro-1H-1,2,4-triazole-5-thiones was synthesized by the reaction of 1,2,4-triazole-5-thiones with alkyl, benzyl, and phenacyl halides as well as halogen-containing esters or amides. The reactions were carried out in DMF in the presence of KOH, K2CO3, or triethylamine, or in dioxane in the presence of NaH. The synthesized compounds were screened for their free radical scavenging activity. N-[2-[5-(Butylsulfanyl)-4-phenyl-4H-1,2,4-triazol-3-yl]ethyl]-4-methylaniline showed excellent antioxidant activity, 2.5 times higher than that of the antibiotic control (cefazolin).Graphical abstract

N′-(1,3-Dithiolan-2-ylidene)-3-(phenylamino)propanehydrazide

A synthesis of N′-(1,3-dithiolan-2-ylidene)-3-(phenylamino)propanehydrazide from 3-(phenylamino)propanehydrazide, carbon disulfide and 1,2-dibromoethane is reported. The title compound was characterized by 1H NMR, 13C NMR, ESI/MS, and elemental analysis.

Alkylation of 1-(3,4-Disubstituted Phenyl)-2-thioxo-1,2,5,6-tetrahydropyrimidin-4(3H)-ones

The results of a comprehensive investigation of the alkylation of the title compounds with MeI in butanone in the presence of K2CO3 are presented.

Synthesis of novel 1,2- and 2-substituted benzimidazoles with high antibacterial and antioxidant activity

Benzimidazole derivatives are potential candidates for drug development. They are efficiently synthesized and possess various biological properties including antibacterial activity. A series of functionalized benzimidazole derivatives bearing N-(4-chloro- or fluorophenyl)pyrrolidin-2-one or N-(4-chloro- or fluorophenyl)aminobutanoic acid moiety were synthesized. Compounds possessing a very high antibacterial activity, comparable to that of a commercial antibacterial agent oxytetracycline, against Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Bacillus cereus were identified. Some of the synthesized compounds exhibited significant antioxidant activity.Graphical abstract