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.
Transition-Metal-Free Oxidative Decarboxylative Cross Coupling of α,β-Unsaturated Carboxylic Acids with Cyclic Ethers under Air Conditions: Mild Synthesis of α-Oxyalkyl Ketones
A novel K2S2O8-promoted decarboxylative cross coupling of α,β-unsaturated carboxylic acids with cyclic ethers was developed under aerobic conditions. The present protocol, which includes C–C and C═O bond formation in one step through addition, oxidation, and decarboxylation processes, leads to the desired ketone products in moderate to excellent yields. In addition, mechanism studies showed that the
在好氧条件下,开发了一种新型的K 2 S 2 O 8促进的α,β-不饱和羧酸与环醚的脱羧交叉偶联。本方案包括通过加成,氧化和脱羧过程一步形成C–C和C═O键,从而以中等至极好的收率得到了所需的酮产物。此外,机制的研究表明,在转化过程经历经由α-SP的直接活化自由基途径3环醚的氧的C-H键。