Synthesis, structural revision, and biological activities of 4′-chloroaurone, a metabolite of marine brown alga Spatoglossum variabile |
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Authors: | Somepalli Venkateswarlu |
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Institution: | Laila Research Centre, Unit 1, Phase III, Jawahar Autonagar, Vijayawada 520 007, Andhra Pradesh, India |
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Abstract: | 4′-Chloroaurone (1a), the only aurone reported from a marine source, Spatoglossum variabile was synthesized from 2-hydroxyacetophenone along with six structural analogs. The products obtained were Z-isomers and these were converted into E-isomers by photoisomerization. The E and Z isomers of aurones showed distinct proton and carbon chemical shifts. However, the spectroscopic data of either Z-4′-chloroaurone (1a) or its E-isomer (2a) did not match with those reported for the natural product and thus requires revision of the structure assigned. The proton NMR spectroscopic data reported for the natural product matches with those reported for a known isocoumarin (5). The synthesized E and Z aurones were evaluated for their antioxidant and antibacterial activities. The aurone, Z-2-(3,4-dihydroxyphenyl)methylene]benzob]furan-3-one exhibited significant antioxidant activity. Interestingly, Z-aurones are active against Gram-positive and Gram-negative bacteria, whereas the corresponding E-aurones were inactive. |
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Keywords: | 4&prime -Chloroaurone Spatoglossum variabile Synthesis Structural revision Isocoumarin Antioxidant Antibacterial |
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