Structure Determination of Nephalsterol A and B with 19-hydroxy Group from Soft Corals Nephthea

Chem. J. Chinese Universities ›› 1992, Vol. 13 ›› Issue (5): 623.

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Structure Determination of Nephalsterol A and B with 19-hydroxy Group from Soft Corals Nephthea

WANG Guiyang-sheng¹, LI Feng-ying¹, ZENG Long-mei¹, MA Li-bin², TU Guang-zhong²

1. Department of Chemistry, Zhongshan University, Guangzhou, 510075;
2. Beijing Microchemical Institute, Beijing

Received:1991-08-03 Online:1992-05-24 Published:1992-05-24

Abstract

Abstract: Two 19-hydroxylated sterols, name ne phalsterd-A (1) and B (2) were isolated from the soft corals, Nephthea albida and Nephthea tiexieral verseveldt collected off Xisha and Nansha Islands respectively.On the basis of one and two dimensional NMR and other spectroscopy methods, the structures of 1 and 2 were characterized as 24-methylene-cholestan-3β,5α,6β,19-tetrol and 24-methylene-cholestan-5-ene-3β, 7β, 19-triol respectively.1 is an unknown compound.The structure of 2 is identical with the sterols which was isolated from the soft coral Litophyton viridis by M.Bortolotto.The ¹H and ¹³C NMR data of 1 and 2 were first assigned from the ¹H-¹H and ¹³C-1H COSY and COLOC spectra in this paper.

Key words: Soft corals, Polyhydroxylated sterols, Nephthea albida, Nephthea tiexieral verse-veldt, NMR spectra

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WANG Guiyang-sheng, LI Feng-ying, ZENG Long-mei, MA Li-bin, TU Guang-zhong. Structure Determination of Nephalsterol A and B with 19-hydroxy Group from Soft Corals Nephthea[J]. Chem. J. Chinese Universities, 1992, 13(5): 623.

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Structure Determination of Nephalsterol A and B with 19-hydroxy Group from Soft Corals Nephthea

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