New chromenochalcones from Flemingia |
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Authors: | Barbara Cardillo Angelo Gennaro Lucio Merlini Gianluca Nasini Stefano Servi |
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Institution: | Politecnico, Istituto di Chimica, Centro del C.N.R. per lo Studio delle Sostanze Organiche Naturali, 20133 Milano, Italia |
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Abstract: | 2-Methyl-2-(4′-methylpent-3′-enyl)-5,8-dihydroxy-6-(4-hydroxycinnamoyl)-chromene (flemingin-D) has been isolated from inflorescences of Flemingia congesta, together with the known flemingin-C and two other chalcones. These (flemingin-E and -F) are allylic alcohols which differ from flemingin-D by an additional OH group in the side chain. Photooxidation of model 2-methyl-2-(4′-methylpent-3′-enyl)-chromenes gave pairs of allylic alcohols with the same structural feature. The known flemingin-A, -B, -C and homoflemingins have been isolated from F. grahamiana, and another new chalcone from F. bracteata. |
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Keywords: | Legurninosae chromenes chalcones photooxidation |
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