7-<i>e</i><i>ndo</i> Radical Cyclizations Catalyzed by Titanocene(III). Straightforward Synthesis of Terpenoids with Seven-Membered Carbocycles
作者:José Justicia、Juan L. Oller-López、Araceli G. Campaña、J. Enrique Oltra、Juan M. Cuerva、Elena Buñuel、Diego J. Cárdenas
DOI:10.1021/ja054316o
日期:2005.10.1
We describe a novelprocedure for the straightforward synthesis of seven-membered carbocycles via free-radical chemistry, based on titanocene(III)-catalyzed 7-endo-dig and 7-endo-trig cyclizations. This procedure has proved to be useful for the chemical preparation of terpenoids with different skeletons containing cycloheptane rings, including the first total syntheses of dauca-4(11),8-diene (2), barekoxide
A New Strategy for the Synthesis of Cyclic Terpenoids Based on the Radical Opening of Acyclic Epoxypolyenes
作者:Alejandro F. Barrero、Juan M. Cuerva、M. M. Herrador、Mónica V. Valdivia
DOI:10.1021/jo0155207
日期:2001.6.1
Total Synthesis of an Atropisomer of the
<i>Schisandra</i>
Triterpenoid Schiglautone A
作者:Binjie Ma、Yifan Zhao、Chi He、Hanfeng Ding
DOI:10.1002/anie.201809076
日期:2018.11.19
A diastereoselective approach for the total synthesis of an unusual atropisomer of the Schisandra triterpenoid (±)‐schiglautone A is described. The efficient synthetic strategy features three key transformations: 1) two sequential titanium(III)‐catalyzed radical cyclization/homologation reactions to construct the trans‐fused [6,7] bicycle as well as install the quaternary carbons at C10 and C14 with