Undecorated Cu(OAc)<sub>2</sub>-Catalyzed C(sp<sup>3</sup>)-C(sp<sup>3</sup>) Bond Formation through<i>para</i>-Hydroxy Group Triggered Remote Benzylic C(sp<sup>3</sup>)-H Bond Functionalization
作者:Jian-Gang Huang、Ying Guo、Yu-Dan Li、Hong-Wei Liu、Dao-Hua Liao、Ya-Fei Ji
DOI:10.1002/ejoc.201500706
日期:2015.8
The undecoratedCu(OAc)2-catalyzed para-hydroxy grouptriggered oxidative coupling of 2,6-disubstituted 4-cresols with fluorinated β-keto esters or malonates leading to benzylicC(sp3)–C(sp3) bondformation was investigated. This formal double C(sp3)–H coupling method features mild conditions, atom economy, ligand- and additive-free catalysis, and ambient air as the terminal oxidant. This ecofriendly
Catalyst-free, direct electrooxidative phenol derivatives C(sp3)–H mono- and di-alkylation reaction have been developed. In contrast to previous typical oxidative and electrochemical coupling, this electrosynthetic approach enables selective mono- and di-alkylations through metal- and external oxidant-free mild conditions via easily available electrodes. Advances of this strategy were proven by an