2012•Journal of Chemical ResearchRequires access

Structural Determination of 3 β ,11 β -Dihydroxyfriedelane from Maytenus Robusta (Celastraceae) by 1D and 2D NMR

Grasiely Faria de Sousa, Fernanda Lopes Ferreira, Lucienir Pains Duarte, Grácia D. F. Silva, Maria Cristina Teixeira Braga Messias, Sidney Augusto Vieira Filho

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Abstract

A new pentacyclic triterpene, 3 β,11 β-dihydroxyfriedelane was isolated from leaves of Maytenus robusta Reissek (Celastraceae) together with other four known compounds: 3-oxofriedelane (friedelin), 3 β-hydroxyfriedelane, 3-oxo-29-hydroxyfriedelane and 3-oxo-11 β-hydroxyfriedelane. The structure and chemical conformation of the new friedelane triterpene were established by 1 H and 13 C NMR, including the 2D experiments, HSQC, HMBC, COSY and NOESY.

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Available abstract

Key concepts: Celastraceae, Friedelin, Triterpene, Stereochemistry, Heteronuclear single quantum coherence spectroscopy, Two-dimensional nuclear magnetic resonance spectroscopy, Chemistry, Triterpenoid