Use of Strain-Release for the Diastereoselective Construction of Quaternary Carbon Centers
作者:Tobias Pinkert、Mowpriya Das、Malte L. Schrader、Frank Glorius
DOI:10.1021/jacs.1c03492
日期:2021.5.26
formation of quaternary carbon centers with excellent diastereoselectivity via a strain-release protocol. An organometallic species is generated by Cp*Rh(III)-catalyzed C–H activation, which is then coupled with strained bicyclobutanes (BCBs) and a prochiral carbon electrophile in a three-component reaction. This work illustrates a rare example of BCBs in transition metal catalysis and demonstrates their
Palladium-catalyzed C–H activation/C–C cross-coupling reactions via electrochemistry
作者:Cong Ma、Chuan-Qi Zhao、Yi-Qian Li、Li-Pu Zhang、Xue-Tao Xu、Kun Zhang、Tian-Sheng Mei
DOI:10.1039/c7cc07429h
日期:——
Palladium-catalyzed C–H activation/C–C cross-couplingreactions have emerged as attractive tools for organic synthesis. Typically, these reactions require stoichiometric chemical oxidants and exogenous ligands to regenerate the palladium catalyst and promote reductive elimination respectively. However, there are significant disadvantages associated with the use of traditional stoichiometric oxidants
Rhodium-Catalyzed Direct CH Amination of Benzamides with Aryl Azides: A Synthetic Route to Diarylamines
作者:Jaeyune Ryu、Kwangmin Shin、Sae Hume Park、Ji Young Kim、Sukbok Chang
DOI:10.1002/anie.201205723
日期:2012.9.24
No muss, no fuss: A rhodium‐catalyzed direct intermolecular CHamination of benzamides and ketoximes using arylazides as the amine source has been developed. The reaction exhibits a broad substrate scope with excellent functional‐group tolerance, requires no external oxidants, releases N2 as the only by‐product, and produces diarylamines in high yields.
Rh(III)-Catalyzed C–H Alkylation of Arenes Using Alkylboron Reagents
作者:He Wang、Songjie Yu、Zisong Qi、Xingwei Li
DOI:10.1021/acs.orglett.5b01232
日期:2015.6.5
alkylation of arenes using commercially available alkyltrifluoroborates is disclosed. Oximes, heteroarenes, azomethines, N-nitrosoamines, and amides are viable directing groups to entail this transformation. The alkyl group in the boron reagent can be extended to primary alkyls, benzyl, and cycloalkyls, and the reaction proceeded with controllable mono- and dialkylation selectivity when both ortho C–H
Ruthenium(II)-Catalyzed α-Fluoroalkenylation of Oxime Ethers with <i>gem</i>-Difluorostyrenes <i>via</i> C–H Activation and C–F Cleavage
作者:Lili Zhang、Kezuan Deng、Gaorong Wu、Jinyue Yang、Shibiao Tang、Xiaopan Fu、Chengcai Xia、Yafei Ji
DOI:10.1021/acs.joc.0c01842
日期:2020.10.2
A novel route for ruthenium(II)-catalyzed α-fluoroalkenylation of oxime ethers with gem-difluorostyrenes via C–Hactivation and C–F cleavage has been developed for the first time. Notably, the alkenyl units of products exhibit exclusive Z-configuration. This reaction features a broad substrate scope and good functional group tolerance. A plausible reaction mechanism is confirmed by an available cycloruthenated