A new chromanone acid from the bark of Calophyllum dryobalanoides |
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Authors: | Ly D. Ha Poul Erik Hansen Fritz Duus Hung D. Pham Lien-Hoa D. Nguyen |
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Affiliation: | 1. Faculty of Chemistry, Ho Chi Minh City University of Science, 227 Nguyen Van Cu, Ho Chi Minh City, Viet Nam;2. Department of Science, Systems and Models, Roskilde University, P.O. Box 260, DK-4000, Roskilde, Denmark |
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Abstract: | A new chromanone acid, calodryobalanoic acid, along with six known compounds, apetalic acid, isoblancoic acid, lupeol, 1-hydroxy-2-methoxyxanthone, 1,7-dihydroxy-3-methoxyxanthone, and 5,7,4′-trihydroxyflavanone, was isolated from the bark of Calophyllum dryobalanoides collected in Vietnam. The structure of the new compound was elucidated using mainly 1-D and 2-D NMR techniques (1H and 13C NMR, HSQC, HMBC, COSY, and NOESY) and IR spectroscopy. The stereochemistry was determined on the basis of NMR results and DFT calculations. |
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