Abstract
A series of furanoflavonoids analogous to karanjin have been synthesized starting from resacetophenone. Initially, resacetophenone was reacted with bromoacetaldehyde diethylacetal, and the resultant phenoxy acetal, on cyclization, produced linear, 5-acetyl-6-hydroxybenzofuran (3) and angular, 5-acetyl-4-hydroxybenzofuran (4). The linear and angular benzofuran on Claisen–Schmidt condensation with a series of substituted aryl aldehyde produced initially furanochalcones, which on cyclization in presence of alkaline hydrogen peroxide produced the corresponding furanoflavonoids. Synthesized compounds were assayed for mosquito larvicidal activity against Culex quinquefasciatus strain. The results showed enhanced toxic effect of analogues on mosquito larvae compared to karanjin. Angular furanochalcone with no substituent on the aryl moiety and its corresponding angular furanoflavonoid were found to be the most toxic among the studied compounds. Angular furanochalcones showed better activity than their corresponding linear counterparts. An interesting observation is higher toxicity towards the studied larval strain of precursor angular furanochalcones compared to their corresponding furanoflavonoids in most cases.
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Authors gratefully acknowledge the financial grant received from the Department of Science and Technology, Govt. of India under Technology System Development (TSD) Program.
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Satyavani, S.R., Kanjilal, S., Rao, M.S. et al. Synthesis and mosquito larvicidal activity of furanochalcones and furanoflavonoids analogous to karanjin. Med Chem Res 24, 842–850 (2015). https://doi.org/10.1007/s00044-014-1160-4
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DOI: https://doi.org/10.1007/s00044-014-1160-4