Metal-Free, Visible-Light-Mediated Direct C–H Arylation of Heteroarenes with Aryl Diazonium Salts
作者:Durga Prasad Hari、Peter Schroll、Burkhard König
DOI:10.1021/ja212099r
日期:2012.2.15
Visible light along with 1 mol % eosinYcatalyzes the direct C-H bond arylation of heteroarenes with aryl diazonium salts by a photoredox process. We have investigated the scope of the reaction for several aryl diazonium salts and heteroarenes. The general and easy procedure provides a transition-metal-free alternative for the formation of aryl-heteroaryl bonds.
可见光和 1 mol% 曙红 Y 通过光氧化还原过程催化杂芳烃与芳基重氮盐的直接 CH 键芳基化。我们研究了几种芳基重氮盐和杂芳烃的反应范围。通用且简单的程序为芳基-杂芳基键的形成提供了一种不含过渡金属的替代方法。
Optimized Stille coupling reactions catalyzed by palladium on carbon with CuI as cocatalyst
作者:Gregory P. Roth、Vittorio Farina、Lanny S. Liebeskind、Eduardo Peña-Cabrera
DOI:10.1016/0040-4039(95)00232-2
日期:1995.3
The coupling reaction of aryl and vinyl iodides, bromides, and triflates with organostannanes can be effectively conducted using palladium on carbon as a source of Pd0. The yield and rate of reaction are significantly affected by the addition of copper iodide as co-catalyst and triphenylarsine as ligand.
catalyst for the directarylation of 3-substituted thiophene derivatives. The regioselectivity of the arylation strongly depends on the thiophene substituent and also on the nature of the arylbromide. When using 3-formyl, 3-cyano, 3-methyl, 3-hydroxymethyl or 3-bromothiophene, the 2-arylated thiophenes were obtained with 76-95% regioselectivity; whereas, the arylation of 3-formylthiophene diethylacetal