Silver-Promoted, Palladium-Catalyzed Direct Arylation of Cyclopropanes: Facile Access to Spiro 3,3′-Cyclopropyl Oxindoles
摘要:
The Pd-catalyzed, Ag(I)-mediated intramolecular direct arylation of cyclopropane C H bonds is described. Various spiro 3,3'-cyclopropyl oxindoles can be obtained in good to excellent yields from easily accessible 2-bromoanilides. The kinetic isotope effect was determined and epimerization studies were conducted, suggesting that the formation of a putative Pd-enolate is not operative and that the reaction proceeds via a C-H arylation pathway.
A Palladium-Catalyzed Regiospecific Synthesis ofN-Aryl Benzimidazoles
作者:Nan Zheng、Kevin W. Anderson、Xiaohua Huang、Hanh Nho Nguyen、Stephen L. Buchwald
DOI:10.1002/anie.200702542
日期:2007.10.1
Synthesis of Functionalized Spiroindolines <i>via</i> Palladium-Catalyzed Methine C–H Arylation
作者:Tanguy Saget、David Perez、Nicolai Cramer
DOI:10.1021/ol400380y
日期:2013.3.15
The synthesis of cyclopropyl spiroindolines is described using an intramolecular palladium(0)-catalyzed C–H functionalization of a methine C(sp3)–H bond. This transformation can be coupled with intermolecular Suzuki couplings or direct arylations of heteroaromatics to accessfunctionalized indoline scaffolds in a single step.
Silver-Promoted, Palladium-Catalyzed Direct Arylation of Cyclopropanes: Facile Access to Spiro 3,3′-Cyclopropyl Oxindoles
作者:Carolyn L. Ladd、Daniela Sustac Roman、André B. Charette
DOI:10.1021/ol4003338
日期:2013.3.15
The Pd-catalyzed, Ag(I)-mediated intramolecular direct arylation of cyclopropane C H bonds is described. Various spiro 3,3'-cyclopropyl oxindoles can be obtained in good to excellent yields from easily accessible 2-bromoanilides. The kinetic isotope effect was determined and epimerization studies were conducted, suggesting that the formation of a putative Pd-enolate is not operative and that the reaction proceeds via a C-H arylation pathway.