Structural revision of methyl tortuoate D, a bis-cembranoid from Hainan Sarcophyton tortuosum and its absolute stereochemistry.
JOURNAL OF ASIAN NATURAL PRODUCTS RESEARCH(2013)
Abstract
Methyl tortuoate D (1), together with five other known related bis-cembranoids, was isolated from Hainan soft coral Sarcophyton tortuosum. The structure of methyl tortuoate D (1a), firstly isolated and reported by Li et al. from the title organism, was corrected as 1 by an extensive analysis of its one-dimensional and two-dimensional nuclear magnetic resonance data and by comparison with those reported in the literature. In addition, lobophytone K (1b), recently isolated from Hainan soft coral Lobophytum pauciflorum by Lin et al., was proved to be the same compound as 1 and 1a. The absolute configuration of 1 was determined by comparing its electronic circular dichroism curve with that of co-occurring ximaolide A (2).
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Key words
soft coral,Sarcophyton tortuosum,bis-cembranoids
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