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。
Visible-Light-Driven Denitrogenative C–C Bond Formation and Oxidative Difunctionalization of Vinyl Azides
作者:Adinath Majee、Santosh Sing Sardar、Aramita De、Satyajit Pal、Subhankar Sarkar、Sougata Santra、Grigory V. Zyryanov
DOI:10.1055/a-2131-3208
日期:2024.2
A newer synthetic protocol has been developed to synthesize α-oxyalkyl ketonesfromvinylazides under transition-metal-free reaction conditions. The reaction proceeds in the presence of organic photoredox catalyst rose bengal, an oxidant tert-butyl hydroperoxide (TBHP), and ethers. A broad range of substituted vinylazides were found to react smoothly upon visible-light irradiation, which readily
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