Free-Radical Cascade Alkylarylation of Alkenes with Simple Alkanes: Highly Efficient Access to Oxindoles via Selective (sp<sup>3</sup>)C–H and (sp<sup>2</sup>)C–H Bond Functionalization
作者:Zejiang Li、Ye Zhang、Lizhi Zhang、Zhong-Quan Liu
DOI:10.1021/ol4032478
日期:2014.1.17
A copper-catalyzed alkylarylation of alkenes with simple alkanes was achieved, which not only provided an efficient method to prepare various alkyl-substituted oxindoles, but also represented a novel strategy for selective sp3 C–H functionalization/C–C bond formation via a free-radical cascade process. Additionally, selective activation of unactivated (sp3)C–H and (sp2)C–H bonds by one single step
acylhydrazides as alkylatingagents has been demonstrated in the copper-catalyzed tandem alkylation/cyclization of N-arylacrylamides. A range of aliphatic acylhydrazides smoothly participated in the oxidative 5-exo-trig cyclization of N-arylacrylamides with CuCO3 as the catalyst and DTBP as the oxidant, delivering structurally diverse 3,3-dialkyloxindoles in moderate to good yields. This study paves the way