Radical Cyclizations as Key Step for the Stereoselective Synthesis of Bi- and Tricyclic Sesquiterpene Lactones
作者:Oliver Reiser、Eva Jezek、Andreas Schall、Peter Kreitmeier
DOI:10.1055/s-2005-864827
日期:——
A strategy towards the stereoselective synthesis of bi-and tricyclic sesquiterpene lactones is reported. As key step radical cyclizations of appropriately functionalized trans-4,5-disubstituted γ-butyrolactones, which arereadily available from methyl 2-furoate, were carried out to give rise to 5,6-, 5,7- and 5,7,5-ring systems in diastereo- and enantiomerically pure form.
报道了双环和三环倍半萜内酯立体选择性合成的策略。作为关键步骤,适当官能化的反式-4,5-二取代 γ-丁内酯可从 2-糠酸甲酯中获得,进行自由基环化以产生 5,6-、5,7- 和 5,7,5 -非对映体和对映体纯形式的环系统。