波谱学杂志 ›› 2004, Vol. 21 ›› Issue (3): 311-315.

• 研究论文 • 上一篇    下一篇

NOESY谱在地胆草倍半萜内酯化合物结构鉴定中的应用(Ⅱ)

梁侨丽1, 2,龚祝南1,施国新1   

  1. 1.南京师范大学 生命科学学院, 江苏 南京 210097;  2.南京中医药大学 药学院, 江苏 南京 210029
  • 收稿日期:2003-10-20 修回日期:2004-03-04 出版日期:2004-09-05 发布日期:2004-09-05

APPLICATION OF THE NOESY TECHNIQUE IN STRUCTURE ELUCIDATION OF  SESQUITERPENOIDES ISOLATED FROM ELEPHANTOPUS SCABER(Ⅱ)

 LIANG Qiao-Li,1, 2 GONG Zhu-Nan1, SHI Guo-Xin1   

  1. 1. Nanjing Normal University, Nanjing 210097,China; 2. Nanjing University of Traditional Chinese Medicine, Nanjing 210029, China
  • Received:2003-10-20 Revised:2004-03-04 Online:2004-09-05 Published:2004-09-05

摘要:

目的 [HTSS]正确归属从地胆草中分离得到的两对牻牛儿内酯型的立体异构体即地胆草种内酯(scabertopin)和异地胆草种内酯(isoscabertopin)以及异去氧地胆草内酯(isodeoxyelephantopin)和去氧地胆草内酯(deoxyelephantopin)的1H NMR谱信号;方法 利用NOESY技术,并结合这4个化合物的1H NMR谱信息. 结果 地胆草牻牛儿内酯型立体异构体化合物十元环中3位上的两个质子以及9位上的两个质子在1H NMR谱中的信号位置都是相反的.  结论 分析两对立体异构体的NOESY谱差异,可以对其1H NMR谱中3位和9位亚甲基的质子信号进行正确归属.

关键词: 核磁共振, 归属, NOESY谱, 地胆草, 倍半萜内酯

Abstract:

Two pairs of stereo-isomers with germacranolide type, sabertopin and isoscabertopin, and isodeoxyelephantopin and deoxyelephantopin, were isolated from Elephantopus scaber. Their 1H chemical shifts were assigned correctly by the NOESY technique. The two protons signals of C-3 in the stereo-isomers were found to be in opposite positions, and so were the two protons signals of C-9.

Key words: NMR, assignments, NOESY, Elephantopus scaber, sesquiterpenoides

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