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学科主题: Chemistry, Multidisciplinary; Chemistry, Physical; Spectroscopy
题名: Xylocarpins A and B, two new mexicanolides from the seeds of a Chinese mangrove Xylocarpus granatum: NMR investigation in mixture
作者: Li, MY ; Wu, J ; Zhang, S ; Xiao, Q ; Li, QX
通讯作者: wwujun2003@yahoo.com
关键词: NMR ; H-1 NMR ; C-13 NMR ; 2D NMR ; mexicanolide ; Xylocarpus granatum ; complete NMR assignments ; sodium borohydride ; reduction
刊名: MAGNETIC RESONANCE IN CHEMISTRY
发表日期: 2007
卷: 45, 期:8, 页:705-709
收录类别: sci
部门归属: Chinese Acad Sci, S China Sea Inst Oceanol, Guangdong Key Lab Marine Mat Med, Guangzhou 510301, Peoples R China; Jiangxi Sci & Technol Normal Univ, Inst Organ Chem, Nanchang 330013, Peoples R China
项目归属: 广东省海洋药物重点实验室
摘要: Xylocarpins A and B, two new mexicanolides with a tiglate group at C-3, have been identified in the mixture using NMR spectroscopy. Both compounds were isolated in the mixture from the seeds of a Chinese mangrove Xylocarpus granatum. The first complete assignments of H-1 and C-13 NMR data for these mexicanolides were achieved by means of 2D NMR techniques including H-1-H-1 COSY, HSQC, HMBC and NOESY spectra. In order to separate xylocarpins A (1) and B (2) by chemical method, the mixture of two compounds was reduced with sodium borohydride in anhydrous methanol. However, the reduction led to the opening of the delta-lactone ring in xylocarpin B and afforded compound 3 as the main product. The complete NMR assignments of compound 3 were also achieved by means of the above 2D NMR techniques. Moreover, xylocarpin A was easily transformed into xylocarpin B during our normal liquid column chromatography. From this point of view, xylocarpin A was deemed to be the genuine natural product and xylocarpin B might be an artifact. Copyright (c) 2007 John Wiley & Sons, Ltd.
原文出处: 查看原文
WOS记录号: WOS:000248527100016
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/5224
Appears in Collections:广东省海洋药物重点实验室_期刊论文

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Li, MY; Wu, J; Zhang, S; Xiao, Q; Li, QX.Xylocarpins A and B, two new mexicanolides from the seeds of a Chinese mangrove Xylocarpus granatum: NMR investigation in mixture,MAGNETIC RESONANCE IN CHEMISTRY,2007,45(8):705-709
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