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.
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。