A new chromanone acid from the bark of Calophyllum dryobalanoides

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• 作者：Ly D. Ha^a ; ^b ; Poul Erik Hansen^b ; ^{poulerik@ruc.dk} ; Fritz Duus^b ; Hung D. Pham^a ; Lien-Hoa D. Nguyen^a
• 关键词：Calophyllum dryobalanoides ; Guttiferae ; Calodryobalanoic acid ; NMR spectroscopy ; DFT calculations
• 刊名：Phytochemistry Letters
• 出版年：2012
• 出版时间：June, 2012
• 年：2012
• 卷：5
• 期：2
• 页码：287-291
• 全文大小：284 K

文摘

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.