Facile Synthesis of 3-Thioxo-3H-benzo[f]chromen-2-yl methanone and 3H-Benzo[f]chromene-3-one Under Solvent Free Condition
作者:Okram Mukherjee Singh、Nepram Sushuma Devi、Laishram Ronibala Devi、Ki-Bum Lim、Yong-Jin Yoon、Sang-Geyong Lee
DOI:10.5012/bkcs.2011.32.1.175
日期:2011.1.20
reaction for the synthesis of coumarin involves the condensation of phenols with β-ketonic esters in the presence of variety of acidiccondensingagents such as sul-furic acid, hydrochloric acid and phosphoric acid, phosphorous pentoxide, trifluoroaceticacid and Lewis acids such as ZnCl
Knoevenagel cyclocondensations of alpha-hydroxy naphthaldehyde with beta-oxodithioesters and ketene dithioacetals yielded 2H-benzo[f]chromene-2-thiones and 2H-benzo[f]chromen-2-ones, respectively, in high yields. The newly synthesized compounds were evaluated for antifungal and antibacterial activities. Among them, compounds (2-furyl)(3-thioxo-3H-benzo[f]chromen-2-yl)methanone and phenyl(3-oxo-3H-benzo[f]chromen-2-yl)methanone exhibited excellent antifungal activity against tested fungi Curvularia lunata and Fusarium moniliforme. The highest antibacterial activity against the tested bacteria Escherichia coli and Staphylococcus aureus was observed for (4-chlorophenyl)(3-oxo-3H-benzo[f]chromen-2-yl)methanone. The results of antimicrobial screening demonstrate that (2-furyl)(3-thioxo-3H-benzo[f]chromen-2-yl)methanone, phenyl(3-oxo-3H-benzo[f]chromen-2-yl)methanone, and (4-chlorophenyl)(3-oxo-3H-benzo[f]chromen-2-yl)methanone are promising as antimicrobial drugs.