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The stereochemistry of ledol from Renealmia chrysotrycha: an NMR study
M A Kaplan1, H R Pugialli, D Lopes
1Nucleo de Pesquisa de Produtos Naturais, Universidade Federal do Rio de Janeiro, RJ, Brazil.
Phytochemistry
|February 24, 2001
Abstract:
From the leaves of Renealmia chrysotrycha (Zingiberaceae), we isolated a sesquiterpene alcohol for which spectral data suggested the structure of a 10-aromadendranol. A meticulous NMR investigation, based mainly on vicinal proton-proton coupling constants and NOE interactions, and confirmed by a molecular mechanics calculation, established its relative stereochemistry as that of ledol. This finding resolves several recent literature ambiguities. Three known compounds (aromadendrene, cis-calamenene and palustrol) were also isolated.