Synthesis of Cyclic Alkenyl Dimethylsiloxanes from Alkynyl Benzyldimethylsilanes and Application in Polyene Synthesis
作者:Haraldur G. Gudmundsson、Christian J. Kuper、Damien Cornut、Felix Urbitsch、Bryony L. Elbert、Edward A. Anderson
DOI:10.1021/acs.joc.9b01664
日期:2019.11.15
Cyclic dimethylalkenylsiloxanes, useful motifs for (Z)-selective Hiyama cross-coupling, are accessed from alkynyl benzyldimethylsilanes featuring adjacent allylic or homoallylic oxygen substituents by semihydrogenation/debenzylation/cyclization. While formation of 5- and 6-membered rings can be achieved from the free alcohols using fluoride or silanolate, allylic acetate precursors to 5-membered rings
A Modular, Enantioselective Synthesis of Resolvins D3, E1, and Hybrids
作者:Felix Urbitsch、Bryony L. Elbert、Josep Llaveria、Penelope E. Streatfeild、Edward A. Anderson
DOI:10.1021/acs.orglett.0c00089
日期:2020.2.21
Here, we report a convergent and flexible strategy to prepare these naturalproducts using Hiyama-Denmark coupling of five- and six-membered cyclic alkenylsiloxanes to connect three resolvin fragments, and control the stereochemistry of the naturalproduct (Z)-alkenes. The modular nature of this approach enables the synthesis of novel resolvin hybrids, opening up opportunities for more-extensive investigations
Synthesis and biological profiling of parthenolide ether analogs
作者:Robert R. A. Freund、Philipp Gobrecht、Pascal Moser、Dietmar Fischer、Hans-Dieter Arndt
DOI:10.1039/c9ob02166c
日期:——
Parthenolide (PTL) strongly inhibits the detyrosination of microtubules and accelerates neuronal growth. In order to access cyclic ether derivatives of PTL, ring-closing metathesis (RCM) was investigated in comparison to intramolecularsulfonealkylation. Incompatibility of RCM with epoxides was found in this setting. Biological evaluation for tubulin carboxypeptidase inhibition indicated that the