An efficient synthesis of N-substituted indoles from indoline/indoline carboxylic acid via aromatization followed by C–N cross-coupling reaction by using nano copper oxide as a recyclable catalyst
new and elegant protocol for the synthesis of 1-substituted indoles was developed via aromatization of indoline/indoline carboxylic acid followed by C–N cross-coupling with various aryl halides in the presence of nano CuO as a recyclable catalyst, Cs2CO3 as a base in DMSO at 80 °C. 1-Substituted indoles were obtained in good to excellent yields and the catalytic system can be recycled up to four cycles
通过将二氢吲哚/二氢吲哚羧酸芳构化,然后在作为可回收催化剂的纳米CuO Cs 2 CO 3的存在下,与各种芳基卤化物进行C–N交叉偶联,开发了一种新的且优雅的合成1-取代的吲哚的方案。在80°C下用作DMSO的碱。得到的1-取代的吲哚的收率高至优异,催化体系最多可循环使用四个循环而不会损失催化活性。
Efficient copper-catalyzed N-arylations of nitrogen-containing heterocycles and aliphatic amines in water
作者:Xufeng Li、Daoshan Yang、Yuyang Jiang、Hua Fu
DOI:10.1039/c002172e
日期:——
A simple and efficient copper-catalyzed method has been developed for N-arylations of nitrogen-containing heterocycles and aliphatic amines in water. The protocol uses (1E,2E)-oxalaldehyde dioxime (OADO) as the ligand, and water as the solvent, and shows good tolerance towards various functional groups.
effective bidentate ligand able to promote the Ullmann-type copper-catalyzed coupling of aryl halides with heteroaromatic or aliphatic amines. Furfuryl alcohol (FA) can be mixed with water to form the corresponding azeotrope (20 wt% of FA) and therefore can be easily recovered and reused. This protocol is efficiently applied to substrates with various electronic nature and affords the expected products
Stoichiometric Photochemical Carbene Transfer by Bamford–Stevens Reaction
作者:Sripati Jana、Fang Li、Claire Empel、Dennis Verspeek、Polina Aseeva、Rene M. Koenigs
DOI:10.1002/chem.201904994
日期:2020.2.26
of the reaction partner and thus impacts on the reaction efficiency. Herein, we describe a protocol that takes advantage of the in situ generation of donor-acceptor diazoalkanes by Bamford-Stevens reaction. Following this strategy, the concentration of the diazoalkane reaction partner can be minimized to reduce unwanted side reactions and to now conduct photochemical carbene transfer reactions under
N-Arylation of nitrogen containing heterocycles with aryl halides using copper nanoparticle catalytic system
作者:Gita Pai、Asoke P. Chattopadhyay
DOI:10.1016/j.tetlet.2016.06.019
日期:2016.7
Cu nanoparticles promoted N-arylation of NH-heterocycles with aryl halides is an effective and inexpensive method. In this synthetic protocol, good to excellent yields are obtained. Both aryliodide and arylbromide are compatible with the reaction conditions.