Copper-catalyzed dehydrogenative cross-coupling reaction between unactivated ethers and simple ketones mediated by pyrrolidine
作者:Xing-Fen Huang、Zhi-Qiang Zhu、Zhi-Zhen Huang
DOI:10.1016/j.tet.2013.07.085
日期:2013.10
A copper-catalyzed dehydrogenative cross-coupling reaction between unactivated ethers and simpleketones mediated by pyrrolidine has been developed. Under the catalysis of CuBr2 and in the presence of pyrrolidine, either tetrahydrofuran 2a or tetrahydropyran 2b can react smoothly with a series of methyl aryl ketones 1a–m to give desired coupling products 3aa–mb using TBHP as an oxidant. The advantages
Visible-light induced eosin Y catalysed C(sp2)-H alkylation of carbonyl substrates via direct HAT
作者:Satya Prakash Singh、Vishal Srivastava、Pravin K. Singh、Praveen P. Singh
DOI:10.1016/j.tet.2023.133245
日期:2023.2
(HAT) catalyst for C–Hactivation. A study that utilized the alkylation of C–H bonds with electron-deficientalkenes as a paradigm provided a very wide substrate scope that made it simple to access a number of significant synthons. This green and sustainable eosin Y-based photocatalytic hydrogen atom transfer method promises to diversify the functionalization of a variety of native C–H bonds.
Regioselective Oxyalkylation of Vinylarenes Catalyzed by Diatomite-Supported Manganese Oxide Nanoparticles
作者:Huayin Sun、Yonghui Zhang、Fengfeng Guo、Zhenggen Zha、Zhiyong Wang
DOI:10.1021/jo2026367
日期:2012.4.6
A regioselective oxyalkylation reaction of vinylarenes with cyclic ethers was developed under the catalysis of a new heterogeneous catalyst, the diatomite-supported Mn3O4 nanoparticles (SMONP-1). The use of this heterogeneous catalyst provided a novel approach for the synthesis of alpha-carbonyled beta-alkylated aryl derivatives via a sp(3) C-H bond functionalization under mild aerobic conditions.
CuBr-Mediated Oxyalkylation of Vinylarenes under Aerobic Conditions via Cleavage of sp<sup>3</sup> C−H Bonds α to Oxygen
作者:Kai Cheng、Lehao Huang、Yuhong Zhang
DOI:10.1021/ol900947d
日期:2009.7.2
A novel difunctionalization reaction of vinylarenes with cyclic ethers has been developed by copper catalysis via direct activation of alpha-sp(3) C-H bonds of oxygen in the presence of 1-1.2 equiv of TBHP under mild aerobic conditions. The reaction shows excellent regioselectivities and good functional group tolerance to give the oxyalkylated products of vinylarenes.
Visible-light-promoted oxidative coupling of styrene with cyclic ethers
作者:Golam Kibriya、Debashis Ghosh、Alakananda Hajra
DOI:10.1007/s11426-019-9609-9
日期:2020.1
A new visible-light-promoted oxidative coupling of vinylarenes with cyclic ethers has been developed using rose bengal as photocatalyst and tert-butyl hydrogenperoxide (TBHP) as oxidant under ambient air at room temperature. A library of α-oxyalkylated ketones with broad functionalities has been synthesized in moderate to good yields. A radical mechanism is suggested for the present protocol