Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>/Schiff base/Pd complex as an efficient heterogeneous and recyclable nanocatalyst for chemoselective N-arylation of O-alkyl primary carbamates
作者:A. R. Sardarian、M. Zangiabadi、I. Dindarloo Inaloo
DOI:10.1039/c6ra17268g
日期:——
An Fe3O4@SiO2/Schiff base/Pd complex as an efficient, heterogeneous magnetically recoverable and reusable catalyst for the N-arylation of O-alkyl primary carbamates.
Selective Synthesis of Secondary Arylcarbamates via Efficient and Cost Effective Copper-Catalyzed Mono Arylation of Primary Carbamates with Aryl Halides and Arylboronic Acids
An efficient, selective and cost-effective procedure has been developed for mono N-arylation of primary alkyl and benzyl carbamates with aryliodides and bromides by incorporating CuI as an inexpensive and commercially available catalyst. Despite previous reports on C–N coupling reactions, this process does not need expensive ligands and takes advantage of readily available and inexpensive ethylenediamine
通过引入 CuI 作为廉价且市售的催化剂,已开发出一种高效、选择性和成本效益高的程序,用于伯烷基和苄基氨基甲酸酯与芳基碘化物和溴化物的单 N-芳基化。尽管之前有关于 C-N 偶联反应的报道,但该过程不需要昂贵的配体,并且利用容易获得且价格低廉的乙二胺 (EDA) 作为配体。反应时间相对较短,并且以极好的收率获得了相关的 N-芳基化氨基甲酸酯。有趣的是,用 Cu(OAc)2 代替 CuI 使我们能够使用芳基硼酸作为该反应的偶联伙伴。所有产品均通过 1H- 和 13C-NMR、MS、熔点、IR 和 CHNS 技术进行了充分表征。图形摘要
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
Superparamagnetic Fe<sub>3</sub>
O<sub>4</sub>
Nanoparticles in a Deep Eutectic Solvent: An Efficient and Recyclable Catalytic System for the Synthesis of Primary Carbamates and Monosubstituted Ureas
Superparamagnetic Fe3O4 nanoparticles were used to prepare primary carbamates as well as monosubstituted and N,N‐disubstituted ureas. This efficient phosgene‐free process used urea as an eco‐friendly carbonyl source in the presence of a biocompatible deep eutectic solvent (DES) to provide an inexpensive and attractive route that afforded the products in moderate to excellent yields. (MNP = magnetite nanoparticles
超顺磁性Fe 3 O 4纳米颗粒用于制备氨基甲酸酯以及单取代的和N,N-二取代的脲。这种有效的无光气工艺在生物相容性深共熔溶剂(DES)的存在下将尿素用作环保的羰基来源,从而提供了一种廉价且有吸引力的途径,使产品收率适中至优异。(MNP =磁铁矿纳米颗粒,Ch =胆碱)
4-Dodecylbenzenesulfonic acid (DBSA) promoted solvent-free diversity-oriented synthesis of primary carbamates, S-thiocarbamates and ureas
作者:Ali Reza Sardarian、Iman Dindarloo Inaloo
DOI:10.1039/c5ra14528g
日期:——
A simple and efficient solvent-free preparation of primary carbamates,S-thiocarbamates and ureas from alcohols, phenols, thiols and amines in the presence of 4-dodecylbenzenesulfonic acid, as a cheap and green Brønsted acid, has been described.