Molecular Oxygen-Promoted General and Site-Specific Alkylation with Organoboronic Acid
作者:Anbo Ling、Lizhi Zhang、Ren Xiang Tan、Zhong-Quan Liu
DOI:10.1021/acs.joc.8b02277
日期:2018.12.7
alkylating method using organoboronic acid under 1 atm of oxygen is developed. It allows a facile access to a widerange of functionalized molecules with privileged scaffolds in drugs and natural products such as oxindoles, quinolinones, chromones, naphthoquinones, coumarins, and quinolones. In contrast to previous alkylation approaches that generally requiring transition-metal catalysis and a stoichiometric
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
Transition-metal-free alkylation strategy: facile access to alkylated oxindoles <i>via</i> alkyl transfer
作者:Wen-Qin Yu、Jian-Hong Fan、Pu Chen、Bi-Quan Xiong、Jun Xie、Ke-Wen Tang、Yu Liu
DOI:10.1039/d2ob00019a
日期:——
The transition-metal-free alkylation/cyclization of activated alkenes using Hantzschesterderivatives as effective alkyl reagents is described. A wide variety of valuable oxindoles was constructed in a single step with excellent selectivity. The reaction occurs through the formation of alkyl radical species followed by the tandem addition/annulation of olefins under oxidative conditions. This protocol
Photocatalytic Alkylation/Arylative Cyclization of <i>N</i>-Acrylamides of <i>N</i>-Heteroarenes and Arylamines with Dihydroquinazolinones from Unactivated Ketones
alkylation/arylative cyclization of N-acrylamides─from 2-arylindoles, 2-arylbenzimidazoles, or N-substituted anilines─with ketone-derived dihydroquinazolinones, accessing indolo- and benzimidazolo[2,1-a]isoquinolines or 2-oxindoles. The consecutive incorporation of alkyl- and aryl-carbogenic motifs across a C=C bond via formal cleavage of ketone α-C–C and arene C–H bonds leads to the formation of five- and six-membered