Total Synthesis of the Microtubule Stabilizing Antitumor Agent Laulimalide and Some Nonnatural Analogues: The Power of Sharpless' Asymmetric Epoxidation
作者:Anjum Ahmed、E. Kate Hoegenauer、Valentin S. Enev、Martin Hanbauer、Hanspeter Kaehlig、Elisabeth Öhler、Johann Mulzer
DOI:10.1021/jo026743f
日期:2003.4.1
With (R,R)-tartrate the 16,17-epoxide laulimalide (1) is formed selectively, whereas (S,S)-tartrate generates the 21,22-epoxide 142. This demonstrates the high reagent control involved in the SAE process, which in this case is used to achieve high stereo- and regioselectivity. Laulimalide and some derivatives thereof have been tested with respect to antitumoractivity and compared to standard compounds
Concise total synthesis of (+)-goniofufurone and goniobutenolides A and B
作者:Jean-Philippe Surivet、Jean-Michel Vatèle
DOI:10.1016/0040-4039(96)00820-9
日期:1996.6
Cytotoxic styryl lactones, (+)-goniofufurone and goniobutenolides A and B have been prepared in optically and diastereomerically pure form from (R)-(−)-mandelic acid via the β-hydroxy sulfone 4 as a common intermediate.
skeleton was assembled by means of Julia-Kocienski (C16-C17) and Horner-Wadsworth-Emmons (C21-C22) olefinations. Still-Gennari olefination was used for the C2-C3 ring closure. The key step of the synthesis was a regioselective C16-C17 matched Sharpless asymmetric epoxidation.
A convergent approach to swinholide A. Stereoselective construction of the C<sub>3</sub>–C<sub>17</sub>fragment of swinholide A
作者:A. P. Patron、P. K. Richter、M. J. Tomaszewski、R. A. Miller、K. C. Nicolaou
DOI:10.1039/c39940001147
日期:——
A strategy for a totalsynthesis of the cytotoxic dimeric macrolide swinholide A (1, Scheme 1) is outlined and a stereoselective construction of the suitably functionalized C3–C17 fragment 4, starting with building blocks 6, 7, 9 and 10 is described.
A novel route to enantioenriched (+)-goniodiol and its natural acetylated derivatives, potent cytotoxic compounds, is described. The main features of this synthesis are transfer of the asymmetric information of the scalemic allenic alcohol 5 to the α- and β- carbons through highly diastereoselective reactions and introduction of the α,β-unsaturated lactone moiety by the Ghosez' methodology.