Flavanones from Vernonia diffusa
From the methanolic extract of the wood of Vernonia diffusa two flavanones were isolated and identified: hesperidin and a new flavanone, 3'-methylhesperetin (homoesperetin) and sucrose, which was identified as its acetyl derivative. The homoesperetin was identified as the aglicone obtained in the hydrolysis of the new natural flavanone glycoside, homoesperetin-7-O-rutinoside. From the dichloromethane extract, a mixture of sitosterol and stigmasterol was isolated together with a mixture of aliphatic acids. The new octaacetylhesperidin derivative was also prepared. Structural determination was made by ¹H and 13C-NMR spectrometric data including DEPT, ¹Hx¹H-COSY, and ¹Hx13C-COSY and NOEDIFF techniques.
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| Main Authors: | , , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Sociedade Brasileira de Química
1999
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| Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50531999000200015 |
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| Summary: | From the methanolic extract of the wood of Vernonia diffusa two flavanones were isolated and identified: hesperidin and a new flavanone, 3'-methylhesperetin (homoesperetin) and sucrose, which was identified as its acetyl derivative. The homoesperetin was identified as the aglicone obtained in the hydrolysis of the new natural flavanone glycoside, homoesperetin-7-O-rutinoside. From the dichloromethane extract, a mixture of sitosterol and stigmasterol was isolated together with a mixture of aliphatic acids. The new octaacetylhesperidin derivative was also prepared. Structural determination was made by ¹H and 13C-NMR spectrometric data including DEPT, ¹Hx¹H-COSY, and ¹Hx13C-COSY and NOEDIFF techniques. |
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