Regioselective Sulfonylvinylation of the Unactivated C(sp<sup>3</sup>)–H Bond via a C-Centered Radical-Mediated Hydrogen Atom Transfer (HAT) Process
作者:Shan Yang、Xinxin Wu、Shuo Wu、Chen Zhu
DOI:10.1021/acs.orglett.9b01734
日期:2019.6.21
Given the similarity of multiple sp(3) C-H bonds in electronic properties and bond dissociation energy (DE), regioselective sp(3) C-H bond functionalization remains a paramount challenge. Here, we report a C-centered radical-mediated approach for site-specific sulfonylvinylation of the C(sp(3))-H bond via the hydrogen atom transfer (HAT) process. The reaction features mild conditions, broad substrate scope, and high regioselectivity and stereoselectivity, manifesting the nontrivial synthetic potential.
Chemoselective Tertiary C−H Hydroxylation for Late‐Stage Functionalization with Mn(PDP)/Chloroacetic Acid Catalysis
作者:Rachel K. Chambers、Jinpeng Zhao、Connor P. Delaney、M. Christina White
DOI:10.1002/adsc.201901472
日期:2020.1.23
oxidizing remote tertiary C(sp3)-Hbonds in the presence of a broad range of aromatic and heterocyclic moieties. Although catalyst loadings can be lowered to 0.1 mol% under a Mn(PDP)/acetic acid system for aromatic and non-basic nitrogen heterocycle substrates, the Mn(PDP)/chloroacetic acid system generally affords 10-15% higher isolated yields on these substrates and is uniquely effective for remote C(sp
Regioselective Vinylation of Remote Unactivated C(sp<sup>3</sup>)−H Bonds: Access to Complex Fluoroalkylated Alkenes
作者:Shuo Wu、Xinxin Wu、Dongping Wang、Chen Zhu
DOI:10.1002/anie.201812927
日期:2019.1.28
particular functional group into aliphatic sites by direct activation of unreactive C−H bonds is of great synthetic value. Despite advances in radical‐mediated functionalization of C(sp3)−H bonds by a hydrogen‐atom transfer process, the site‐selective vinylation of remote C(sp3)−H bonds still remains underexplored. Reported herein is a new protocol for the regioselective vinylation of unactivatedC(sp3)−H