作者:Lankun Wu、Jaehoon Bae、George Kraus、Eve Syrkin Wurtele
DOI:10.1016/j.phytochem.2004.06.027
日期:2004.9
The syntheses of three diacetylenic isobutylamides of Echinacea angustifolia have been achieved by direct synthetic routes by way of a common intermediate. The key step is the alkylation of the anion of the silylated diacetylene. We report the presence of all three diacetylenic isobutylamides in six of the nine Echinacea species: E. angustifolia, E sanguinea, E. simulata, E. tennesseensis, E. atrorubens and E. laevigata. The accumulation of these amides is sensitive to organ type and age. (C) 2004 Elsevier Ltd. All rights reserved.