Síntese de aminoálcoois e aminas derivados do furano e do tiofeno com potencial ação imunossupressora e antimicrobiana

Abstract

Amino alcohols are an important class of organic compounds due to their common occurrence in nature, and they are versatile building blocks for organic synthesis. This can be confirmed by the large number of molecules synthesized each year containing this group, emphasizing compounds with immunosuppressive or antimicrobial activity. This work describes the synthesis of aminoalcohols and amines derivatives of aromatic heterocycles such as furan and thiophene, using FTY720 as a prototype compound. A first series of compounds was obtained by reductive amination of furfural, 5-bromo-furfural and thiophene-2-aldehyde with aminoalcohols or octylamine. The second series of compounds was obtained in two steps by reaction of 2-furfuryl, 5-bromo-furfuryl and 2-thiophen methyl alcohols with epichlorohydrin, followed by the treatment of the obtained glycidic ethers with amino alcohols or octylamine, furnishing the corresponding amino alcohols. After purification and characterization of the compounds through the usual spectroscopic methods (1H and 13C NMR, infrared), their biological properties were evaluated in vitro. The antiinflammatory activity was studied through the ability of the compounds to inhibit the production of nitric oxide by activated macrophages. We also evaluated the cytotoxicity by the MTT method and the antimicrobial potential against M. tuberculosis, Gram-positive and Gram-negative bacteria. The results showed that the activity depends on the lipophilicity of the molecules, since the most active compounds carry the octylamine chain.