Late-stage azolation of benzylic C‒H bonds enabled by electrooxidation
作者:Zhixiong Ruan、Zhixing Huang、Zhongnan Xu、Shaogao Zeng、Pengju Feng、Ping-Hua Sun
DOI:10.1007/s11426-020-9938-9
日期:2021.5
The installation of azoles via C-H/N-H cross-coupling is significantly underdeveloped, particularly in benzylic C-H azolation due to the requirement for external chemical oxidants and the challenge in controlling the site- and chemo-selectivity. Herein, a late-stage azolation of benzylic C-H bonds enabled by electrooxidation is described, which proceeds in an undivided cell under mild, catalyst- and
The heterocyclic ionic liquid-catalyzed direct oxidative amination of benzylic sp3 C–H bonds via intermolecular sp3 C–N bond formation for the synthesis of N-alkylated azoles under metal-free conditions is reported for the first time. The catalyst 1-butylpyridinium iodide can be recycled and reused with similar efficacies for at least eight cycles.
Benzylic C(sp<sup>3</sup>)–H Functionalization for C–N and C–O Bond Formation via Visible Light Photoredox Catalysis
作者:Ganesh Pandey、Ramkrishna Laha、Deepak Singh
DOI:10.1021/acs.joc.6b00970
日期:2016.8.19
A visible light mediated highly selective benzylic C–H bond functionalization for intermolecular C–N and C–O bond formation is reported. This cross-dehydrogenative coupling reaction demonstrates a straightforward protocol for incorporating the heteroaromatics to the benzylic position. Benzylic oxidation of various alkyl aryls to corresponding carbonyl compounds has also been reported.
TBHP/I2-Promoted Oxidative Coupling of Azoles with Benzyl Compounds via Cleavage of Nonactivated C(sp3)-H Bonds under Solvent-Free Conditions
作者:Baohua Chen、Xiang Liu、Guiqin Yu、Jihui Li、Dong Wang、Yongxin Chen、Keqin Shi
DOI:10.1055/s-0033-1338871
日期:——
A novel and efficient TBHP/I 2 -promoted oxidative coupling of azoles with benzyl compounds via cleavage of nonactivated C(sp 3 )–H bonds under metal-free, base-free, and solvent-free conditions for the synthesis of N-alkylated azoles has been developed. The procedure, using I 2 as the catalyst, is a simple, economical, and environmentally friendly protocol, which could be applied to various available