Regioselective access to substituted oxindoles via rhodium-catalyzed carbene C–H insertion
作者:Delphine Gauthier、Robert H. Dodd、Philippe Dauban
DOI:10.1016/j.tet.2009.08.006
日期:2009.10
insertion of the resulting carbenes into an aromatic C–H bond gives access to substituted oxindoles. The reaction takes place with aromatic rings substituted by either electron-donating or -withdrawing groups at ortho, meta or para positions and the regioselectivity can be controlled by a substitution α to the diazo functionality. In the presence of an ester, the reaction leads to the formation of 2-silylo
Exploiting Sm(ii) and Sm(iii) in SmI2-initiated reaction cascades: application in a tag removal–cyclisation approach to spirooxindole scaffolds
作者:Susannah C. Coote、Seidjolo Quenum、David J. Procter
DOI:10.1039/c1ob05710c
日期:——
A tag removalâcyclisation sequence is described that is initiated by reduction using a Sm(II) species and completed by a Sm(III) Lewis acid that is formed in an earlier stage. Therefore, the reaction cascade utilises both oxidation states of a samarium reagent in discrete steps and allows access to privileged, pyrrolidinyl-spirooxindole scaffolds and analogues inspired by the anti-cancer natural product spirotryprostatin A.