K2S2O8 mediated metal free oxidative coupling of alcohols with 1,2-diaminobenzenes for synthesis of benzimidazoles, photophysical and DFT studies
作者:Pallavi Saha、Parampreet Kour、Rohit Kumar、Deepak K. Sharma
DOI:10.1016/j.molstruc.2023.136431
日期:2023.12
We report the K2S2O8 catalyzed oxidative coupling of 1,2-diaminobenzenes and primary alcohols for the synthesis of benzimidazoles under metal-free conditions by utilizing oxygen from air as terminal oxidant and water in reaction medium. Also, the challenging aliphatic alcohols showed good performance in synthesis of benzimidazoles. We also carried out a detailed exploration of the mechanism. The metal-free
我们报告 K 2 S 2 O 8利用空气中的氧气作为末端氧化剂和反应介质中的水,在无金属条件下催化 1,2-二氨基苯和伯醇的氧化偶联合成苯并咪唑。此外,具有挑战性的脂肪醇在苯并咪唑的合成中表现出良好的性能。我们还对机制进行了详细的探索。无金属条件、市售氧化剂和良好的官能团耐受性是本策略的优点。此外,我们还研究了苯并咪唑的发光特性。对化合物 5a 和 6m 的吸收和发射光谱进行了实验和计算分析。此外,还从理论上阐明了化合物5a和6m的HOMO/LUMO分布。
Perfluorobutyl iodide-assisted direct cyanomethylation of azoles and phenols with acetonitrile
作者:Juan Zhang、Wei Wu、Xinfei Ji、Song Cao
DOI:10.1039/c5ra02242h
日期:——
perfluorobutyl iodide-assisted transition-metal-free cyanomethylation of azoles and phenols with acetonitrile in the presence of NaH has been developed. The reaction proceeded smoothly under mild reaction conditions to give the cyanomethylated products in moderate to high yields. A mechanism involving the cyanomethyl radical through C–H bond cleavage in acetonitrile was proposed.