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
Copper-catalysed approach to spirocyclic oxindoles via a direct C–H, Ar-H functionalisation
作者:Catherine L. Moody、Vilius Franckevičius、Pauline Drouhin、Johannes E.M.N. Klein、Richard J.K. Taylor
DOI:10.1016/j.tetlet.2012.01.120
日期:2012.4
A practical and efficient entry to spirocyclic oxindoles from readily accessible anilide precursors, using only catalytic amounts of an inexpensive copper salt together with air as the sole re-oxidant, is described. In addition to providing access to a broad range of spiro-oxindole products, the utility of this method is demonstrated in a formal synthesis of the natural product, horsfiline. (C) 2012 Elsevier Ltd. All rights reserved.
Metal-Free Synthesis of 2-Oxindoles via PhI(OAc)<sub>2</sub>-Mediated Oxidative C–C Bond Formation
The series of 3-monofunctionalized 2-oxindoles 2 were conveniently synthesized from reactions between anilide 1 and phenyliodine(III) diacetate (PIDA) through hypervalent iodine mediated C(sp(2))-C(sp(2)) bond formation followed by a subsequent deacylation reaction. This metal-free method, shown to provide direct access to an important oxindole intermediate, could be applied to the total synthesis of naturally occurring horsfiline.