Author/Authors :
Ito، نويسنده , , Tetsuro and Furusawa، نويسنده , , Miyuki and Iliya، نويسنده , , Ibrahim and Tanaka، نويسنده , , Toshiyuki and Nakaya، نويسنده , , Ken-ichi and Sawa، نويسنده , , Ryuichi and Kubota، نويسنده , , Yumiko and Takahashi، نويسنده , , Yoshikazu and Riswan، نويسنده , , Soedarsono and Iinuma، نويسنده , , Munekazu، نويسنده ,
Abstract :
A new resveratrol tetramer, shoreaketone, was isolated from the stem bark of Shorea uliginosa (Dipterocarpaceae). The structure and the relative configuration were confirmed on the basis of 1D- and 2D-NMR spectral data. The structure has a novel framework of fused heptacyclic ring system including an α,β-unsaturated carbonyl group. In NMR spectra, shoreaketone is observed as two different conformers due to rotational isomerism.
Keywords :
Rotational isomer , Shoreaketone , Resveratrol tetramer , Shorea uliginosa , Dipterocarpaceae
