Abstract
A series of symmetric polyoxygenated dibenzofurans with 2-methylbutyril moieties at C-4 and C-6 were obtained from commercial phloroglucinol through a sequence of reactions that include monoacylation, iodination, Suzuki-Miyaura coupling, oxidative dimerization and cyclization. Some of the compounds obtained were active against Gram-positive bacteria, including multiresistant Staphylococcus aureus clinical isolates. The dibenzofuran 28 with propyl chains at C-2 and C-8 exhibited the best antibacterial activity with values comparable to those of the natural dibenzofuran achyrofuran. From the obtained results some structure-activity relationships were outlined.
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