Synthesis, Antimicrobial Activity, and Molecular Docking of N-Phenylcarbamate Derivatives with a Heterocyclic Moiety

By condensing o-phenylenediamine with 2(4)-aminobenzoic acids in 65% polyphosphoric acid at a temperature of 180–190°C for 4 h or by boiling the reagents in o-xylene in the presence of tetrabutoxytitanium, 2-(2(4)-aminophenyl)benzimidazoles were obtained, the acylation of which with methyl chloroformate in the presence of triethylamine led to the production of the corresponding benzimidazoles with a carbamate function. Condensation of o-phenylenediamine and 4-nitro-o-phenylenediamine with glycolic acid in the presence of 70–75% polyphosphoric acid with heating for four hours at 130°C yielded 2-hydroxymethylbenzimidazole with a yield of 81% and 5-nitro-2-hydroxymethylbenzimidazole with a yield of 84%, which, when treated with phenyl isocyanate in tetrahydrofuran at 27–30°C for 3.5 h, were converted into the corresponding benzimidazole derivatives with a yield of 84–86%. In order to find the most promising ones for further biological research, molecular docking of synthesized 2-substituted benzimidazoles, as well as previously obtained carbamate derivatives of pyridazine and N-allyl derivatives of 2-morpholinoethyl-N-phenylcarbamate and 2-(2-pyridinyl)ethyl-N-phenylcarbamate was carried out based on interaction with the enzyme glucosamine-6-phosphate synthase.