Design, synthesis, and in vitro antibacterial screening of some novel 3-pentyloxy-1-hydroxyxanthone derivatives
作者:Aparoop Das、Md. Mutahar Shaikh、Srabanti Jana
DOI:10.1007/s00044-013-0653-x
日期:2014.1
A series of 3-pentyloxy-1-hydroxyxanthone derivatives were synthesized by four-step reactions: first cyclocondensation between salicylic acid and phloroglucinol in the presence of Eaton's reagents, then alkylation with 1,5-dibromopentane, followed by nucleophilic substitution by different nucleophiles to obtain final compounds. Molecular structures of the synthesized compounds were elucidated by FT-IR, H-1 NMR, C-13 NMR, mass spectral data, and elemental analysis. The in vitro antibacterial activity was evaluated by MIC determination using broth dilution method against representative three Gram-positive and three Gram-negative bacterial strains with reference to ofloxacin. All the synthesized compounds showed antibacterial activity; besides the compounds 7f and 7g showed better Gram-positive and Gram-negative antibacterial activities.