Green Approach for the Synthesis of Chalcogenyl-2,3-dihydrobenzofuran Derivatives Through Allyl-phenols/ Naphthols and Their Potential as MAO-B Inhibitors

This work presents the design, synthesis, and MAO-B inhibitor activity of a series of chalcogenyl-2,3-dihydrobenzofurans derivatives. Using solvent- and metal-free methodology, a series of chalcogen-containing dihydrobenzofurans 7-9 was obtained with yields ranging from 40% to 99%, using an I2/DMSO catalytic system. All compounds were fully structurally characterized using 1H and 13C NMR analysis, and the unprecedented compounds were additionally analyzed using high-resolution mass spectrometry (HRMS). In addition, the mechanistic proposal that iodide is the most likely species to act in the transfer of protons along the reaction path was studied through theoretical calculations. Finally, the compounds 7b-e, 8a-e, and 9a showed great promise as inhibitors against MAO-B activity. This study focuses on the design, synthesis, and activity of chalcogenyl-2,3-dihydrobenzofuran derivatives as MAO-B inhibitors. A series of chalcogen-containing dihydrobenzofurans were successfully synthesized using a solvent- and metal-free approach with high yields. The proposed mechanism involving iodide species was investigated through theoretical calculations. Promising MAO-B inhibitory activity was observed for some of the synthesized compounds.image