New neolignans from Krameria tomentosa A. St. -Hil
A phytochemical investigation of the roots of Krameria tomentosa A. St. -Hil. led to the isolation of five neolignans, two of them with novel structures [1,1'-(E)-propenyl-4-methoxy3,4'-oxyneolignan (ottomentosa) and 2-(2'-hydroxy-4',6'-dimethoxyphenyl)benzofuran5-carboxylic acid (sobraline)] and three known compounds [eupomatenoid 6, dihydrocarinatidin and 2-(2',4'-dihydroxyphenyl)-5-(E)-propenylbenzofuran]. The structural characterization of the compounds isolated was established based on infrared spectroscopy, mass spectrometry, one-and two-dimensional nuclear magnetic resonance, along with comparison with spectral data described in the literature.
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| Main Authors: | , , , , , , , |
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| Format: | Digital revista |
| Language: | English |
| Published: |
Sociedade Brasileira de Química
2012
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| Online Access: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-50532012001100010 |
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