TBAI or KI-Promoted Oxidative Coupling of Enamines and <i>N</i>
-Tosylhydrazine: An Unconventional Method toward 1,5- and 1,4,5-Substituted 1,2,3-Triazoles
A novel method for the synthesis of 1,5‐ and 1,4,5‐substituted 1,2,3‐triazoles has been reported. This approach is promoted by iodine‐TBHP oxidation system using enamines and N‐tosylhydrazine as materials, which avoid the dependence of traditional methods on azides and transition metals. Through this approach, various 1,5‐ and 1,4,5‐substituted 1,2,3‐triazoles were delivered in moderate to high yields
已经报道了一种合成1,5-和1,4,5-取代的1,2,3-三唑的新方法。使用烯胺和N-甲苯磺酰肼作为原料的碘-TBHP氧化系统促进了这种方法,避免了传统方法对叠氮化物和过渡金属的依赖。通过这种方法,各种1,5-和1,4,5-取代的1,2,3-三唑以中等到高产量提供。机理研究表明,氨基交换将参与反应过程。此外,产品1-(2-甲氧基苯基)-4-甲基-1 H -1,2,3-三唑-5-羧酸甲酯是抗甲型流感药物的有用前体,并进行了进一步的应用研究。
Exploring the Oxidative Cyclization of Substituted
<i>N</i>
‐Aryl Enamines: Pd‐Catalyzed Formation of Indoles from Anilines
作者:Julia J. Neumann、Souvik Rakshit、Thomas Dröge、Sebastian Würtz、Frank Glorius
DOI:10.1002/chem.201100631
日期:2011.6.20
The direct Pd‐catalyzed oxidative coupling of twoCH‐bonds within N‐aryl‐enamines 1 allows the efficient formation of differently substituted indoles 2. In this cross‐dehydrogenative coupling, many different functional groups are tolerated and the starting material N‐aryl‐enamines 1 can be easily prepared in one step from commercially available anilines. In addition, the whole sequence can also be
Iron-catalyzed aryl C–H and vinyl C–H bonds activation to give valuable substituted indole products was reported. The reaction shows high functional group tolerance.
Oxidative cross-coupling/cyclization to build polysubstituted pyrroles from terminal alkynes and β-enamino esters
作者:Jie Ke、Chuan He、Huiying Liu、Mengjun Li、Aiwen Lei
DOI:10.1039/c3cc43682a
日期:——
A novel silver-mediated highly selective synthesis of polysubstituted pyrroles by the CâH/CâH oxidative cross-coupling/cyclization of terminal alkynes with β-enamino esters has been developed. This protocol represents a simple, efficient and selective way to construct polysubstituted pyrroles in good yields from basic chemical materials.
A facile and efficient method for the synthesis of substituted pyrroles from enaminoesters and nitroolefins is reported. This general procedure provides a wide variety of multisubstituted pyrroles in good to excellent yields under mild reaction conditions.