A novel iron-mediated direct C–H arylation of quinones and pyridine analogues with arylboronic acids has been developed using dichloromethane and water as solvents at ambient temperature. FeS is employed and serves as an efficient catalyst. A detailed reaction mechanism is speculated and expounded.
Metal-free deoxygenative coupling of alcohol-derived benzoates and pyridines for small molecules and DNA-encoded libraries synthesis
作者:Sai Rohini Narayanan Kolusu、Manuel Nappi
DOI:10.1039/d2sc01621d
日期:——
Herein, we report a metal-free method for the deoxygenative coupling of alcohol-derived benzoates and pyridines promoted by visible light. Given the practical, mild and water-compatible conditions, smallmolecules and DNA headpieces can be successfully functionalized with a range of primary, secondary and tertiary alcohols. This protocol is distinguished by its wide substrate scope and broad applicability
醇是天然丰富的生物相关有机化合物中最广泛存在的官能团之一,在许多情况下被视为原料化学品。在此,我们报告了一种在可见光促进下醇衍生的苯甲酸酯和吡啶脱氧偶联的无金属方法。考虑到实用、温和且与水相容的条件,小分子和 DNA 头件可以成功地用一系列伯醇、仲醇和叔醇进行功能化。该方案的特点是其底物范围广泛和适用性广泛,即使在后期功能化和 DNA-药物偶联反应的背景下也是如此。
Direct Arylation of Substituted Pyridines with Arylboronic Acids Catalyzed by Iron(II) Oxalate
作者:Yibo Huang、Dan Guan、Liang Wang
DOI:10.1002/cjoc.201400528
日期:2014.12
The directarylation of substitutedpyridines with several arylboronicacids has been developed. This transformation could proceed readily at ambient temperature using inexpensive reagents: iron(II) oxalate as a catalyst, potassium persulfate as a co‐oxidant, which can afford the arylated products in mild to good yields. The mechanism is presumed to proceed through a nucleophilic radical addition to
Intermediary radical cations, generated through single-electron oxidation of enolsilylethers by excited Ir-based photocatalysts, can be exploited as Brønsted acids for the activation of heteroarylcyanides. This strategy enables the direct allylic C−H heteroarylation of enolsilylethers under visible-light irradiation.
中间自由基阳离子是通过激发的 Ir 基光催化剂通过烯醇甲硅烷基醚的单电子氧化产生的,可用作布朗斯台德酸来活化杂芳基氰化物。该策略使烯醇甲硅烷基醚在可见光照射下直接烯丙基 CH 杂芳基化成为可能。