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

Chinese Journal of Magnetic Resonance ›› 2004, Vol. 21 ›› Issue (3): 311-315.

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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. 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

Abstract

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

CLC Number:

O641

LIANG Qiao-Li, GONG Zhu-Nan, SHI Guo-Xin. APPLICATION OF THE NOESY TECHNIQUE IN STRUCTURE ELUCIDATION OF SESQUITERPENOIDES ISOLATED FROM ELEPHANTOPUS SCABER(Ⅱ)[J]. Chinese Journal of Magnetic Resonance, 2004, 21(3): 311-315.

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

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