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Radical Cyclizations as Key Step for the Stereoselective Synthesis of Bi- and Tricyclic Sesquiterpene Lactones

Jezek, Eva ; Schall, Andreas ; Kreitmeier, Peter ; Reiser, Oliver



Abstract

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 gamma-butyrolactones, which are readily 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.


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