An Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>/Schiff base/Cu(<scp>ii</scp>) complex as an efficient recyclable magnetic nanocatalyst for selective mono <i>N</i>-arylation of primary <i>O</i>-alkyl thiocarbamates and primary <i>O</i>-alkyl carbamates with aryl halides and arylboronic acids
the selective mono N-arylation of primary O-alkyl thiocarbamates and primary O-alkyl carbamates with aryl halides and arylboronic acids in the presence of a recyclable magnetic Cu(II) nanocatalyst is described. A variety of mono N-arylated O-alkyl thiocarbamates and O-alkyl carbamates were prepared in good to excellent yields with a broad range of aryl coupling partners. The magnetic nanocatalyst can
Green and efficient synthesis of thioureas, ureas, primary <i>O</i>-thiocarbamates, and carbamates in deep eutectic solvent/catalyst systems using thiourea and urea
developed for the direct preparation of various primary O-thiocarbamates/carbamates as well as monosubstituted thioureas/ureas by using thiourea/urea as biocompatible thiocarbonyl (carbonyl) sources. This procedure used choline chloride/tin(II) chloride [ChCl][SnCl2]2 with a dual role as a green catalyst and reaction medium to afford the desired products in moderate to excellent yields. Moreover, the DES can
通过使用硫脲/尿素作为生物相容性硫代羰基(羰基)源,开发了一种有效且通用的催化方法,用于直接制备各种伯O-硫代氨基甲酸酯/氨基甲酸酯以及单取代硫脲/脲。该过程使用氯化胆碱/氯化锡 ( II ) [ChCl][SnCl 2 ] 2,具有作为绿色催化剂和反应介质的双重作用,以中等至极好的收率提供所需产物。此外,DES 可以很容易地回收和重复使用七个循环,而其活性没有显着损失。此外,该方法在大规模合成所需产物方面表现出非常好的性能。
A Synthetic Route to Benzothiazocines with Two or Three Carbon Stereocenters via Copper‐Catalyzed Intramolecular N‐Arylation
作者:Mickael Choury、Gaëlle Blond、Mihaela Gulea
DOI:10.1002/ejoc.202100305
日期:2021.4.22
A step economic route toward benzothiazocines bearing two or three carbon stereogenic centers on the 8‐membered ring was established via intramolecular Cu‐catalyzed N‐arylation. The method was successful on one example in the asymmetric version, demonstrating the accessibility of enantioenriched benzothiazocines.