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Cascade Metathesis Reactions for the Synthesis of Taxane and Isotaxane Derivatives
Abstract : Tricyclic isotaxane and taxane derivatives have been synthesized by a very efficient cascade ring-closing dienyne metathesis (RCDEYM) reaction, which formed the A and B rings in one operation. When the alkyne is present at C13 (with no neighboring gem-dimethyl group), the RCEDYM reaction leads to 14,15-isotaxanes 16a,b and 18b with the gem-dimethyl group on the A ring. If the alkyne is at the C11 position (and thus flanked by a gem-dimethyl group), RCEDYM reaction only proceeds in the presence of a trisubstituted olefin at C13, which disfavors the competing diene ring-closing metathesis reaction, to give the tricyclic core of Taxol 44.
https://hal-polytechnique.archives-ouvertes.fr/hal-01355946
Contributor : Denis Roura Connect in order to contact the contributor
Submitted on : Wednesday, August 24, 2016 - 3:04:16 PM
Last modification on : Wednesday, November 25, 2020 - 5:06:03 PM
Contributor : Denis Roura Connect in order to contact the contributor
Submitted on : Wednesday, August 24, 2016 - 3:04:16 PM
Last modification on : Wednesday, November 25, 2020 - 5:06:03 PM
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