Palladium-Catalyzed <i>meta</i>-Selective C–H Functionalization by Noncovalent H-Bonding Interaction
作者:Guoshuai Li、Yifei Yan、Pengfei Zhang、Xiaohua Xu、Zhong Jin
DOI:10.1021/acscatal.1c02974
日期:2021.8.20
conventional directing template strategies via a covalent binding to the substrates are always hindered by prior stoichiometric installation and removal of the directing groups. Herein, we report a palladium-catalyzed meta-selective C–H olefination of aromatic carbonyl compounds by noncovalent hydrogen-bonding interaction. N,N′-Substituted ureas were engineered to serve as a H-bonding donor for binding
Chemoselective Reduction of Sterically Demanding <i>N</i>,<i>N</i>-Diisopropylamides to Aldehydes
作者:Peihong Xiao、Zhixing Tang、Kai Wang、Hua Chen、Qianyou Guo、Yang Chu、Lu Gao、Zhenlei Song
DOI:10.1021/acs.joc.7b02868
日期:2018.2.16
EtOTf and LiAlH(OEt)3 in the absence of base were found to be optimal for reducing extremely sterically demanding 2,6-disubstituted N,N-diisopropylbenzamides. The reaction tolerates various reducible functional groups, including aldehyde and ketone. 1H NMR studies confirmed the formation of imidates stable in water. The synthetic usefulness of this methodology was demonstrated with N,N-diisopropylamide-directed