Assignment of Absolute Stereochemistry and Total Synthesis of (−)-Spongidepsin
作者:Arun K. Ghosh、Xiaoming Xu
DOI:10.1021/ol049292p
日期:2004.6.1
enantioselective total synthesis of (-)-spongidepsin (2) and elucidation of the absolute stereochemistry of its four stereocenters are described. Spongidepsin (2), a 13-membered depsipeptide isolated from the Vanuatu marine sponge Spongia sp., has shown potent antitumor properties against a variety of NCI tumor cell lines. Our synthesis is convergent, and the absolute stereochemistry of four of the five
The formaltotalsynthesis of (−)-spongidepsin is described. Three fragments I, II, and III were first prepared from readily available starting materials and then assembled to the target compound. The key steps involved in the synthesis are asymmetric α-hydroxylation, Ender's alkylation, and ring-closing metathesis reactions. An alternative route for the fragment II is also achieved involving Sharpless
The formal totalsynthesis of (−)-spongidepsin is achieved starting from easily available raw materials involving asymmetric α-hydroxylation, Enders alkylation, and RCM as key reactions.
An Asymmetric Hydrogenation Route To (−)-Spongidepsin
作者:Ye Zhu、Aurore Loudet、Kevin Burgess
DOI:10.1021/ol1018773
日期:2010.10.1
(-)-Spongidepsin 1, a cytotoxic marine natural product, was prepared via two iridium-catalyzed hydrogenation reactions; both were highly stereoselective, giving convenient access to pivotal intermediates. This synthesis was modified to give several spongidepsin analogues, and their cytotoxicities were compared with those of the natural product.