Chromenone Glucosides Acylated with Monoterpene Acids from the Leaves of Eucalyptus camaldulensis var. obtusa

Helvetica Chimica Acta
2011.0

Abstract

<jats:title>Abstract</jats:title><jats:p>Three new chromenone glucosides acylated with monoterpene acids, eucamaldusides A (<jats:bold>1</jats:bold>), B (<jats:bold>2</jats:bold>), and C (<jats:bold>3</jats:bold>), were isolated from the leaves of <jats:italic>Eucalyptus camaldulensis</jats:italic> var. <jats:italic>obtusa</jats:italic>, together with the five known compounds ursolic acid lactone, obtusilin, <jats:italic>β</jats:italic>‐sitosterol glucoside, 4‐hydroxybenzoic acid, and cypellocarpin C. The structures of the new compounds were established by exhaustive 1D‐ and 2D‐NMR spectroscopic studies. Their configuration was determined by measuring the [<jats:italic>α</jats:italic>]<jats:sub>D</jats:sub> of the known methyl esters of the monoterpene acids obtained by methanolysis of <jats:bold>1</jats:bold>–<jats:bold>3</jats:bold>.

Knowledge Graph

Similar Paper