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.
Electrochemical synthesis of 1,2,4,5-tetrasubstituted imidazoles from enamines and benzylamines
作者:Wenxing Wang、Shuo Zhang、Guang Shi、Zhiwei Chen
DOI:10.1039/d1ob00942g
日期:——
An electrochemical method for synthesizing 1,2,4,5-tetrasubstitutedimidazoles was developed under undivided electrolytic conditions. This synthesis was specifically realized based on electrochemical C(sp3)–H amination via enamines and amines. Readily available starting materials were used, avoiding the use of both transition metals and oxidants. The practicability of the method lies in its broad substrate
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.
novel palladium-catalyzed regioselective oxidative carbonylation of tri-substituted alkenes with CO and alcohols for the synthesis of α,β-unsaturated esters has been developed. Experimental studies and DFT calculations suggested that the reaction proceeded through alkoxylation of the palladium(II) catalyst, CO and CC double bond migratory insertion, β-(N)H elimination and tautomerization cascade steps