An expedient Pd/DBU mediated cyanation of aryl/heteroaryl bromides with K4[Fe(CN)6]
作者:Dengyou Zhang、Haifeng Sun、Lei Zhang、Yu Zhou、Chunpu Li、Hualiang Jiang、Kaixian Chen、Hong Liu
DOI:10.1039/c2cc17468e
日期:——
A practical Pd(PPh3)4/DBU catalytic system for the synthesis of pharmaceutically relevant aminopyridine nitrile intermediates, as well as a variety of other aryl nitriles using non-toxic K4[Fe(CN)6] has been developed. The key features of our new protocol for cyanation lie in that the reaction can be carried out with readily available Pd(PPh3)4 under mild and green conditions, even without the assistance of other ligands.
A general and environmentally improved protocol for the cyanation of aryl halides with the nontoxic cyanidesourcepotassiumhexacyanoferrate(II) (K 4 [Fe(CN) 6 ]) using copper catalysis and a ligand system based on l-alkyl-1H -imidazoles is presented. The advantages of this system are a wide substrate range, high selectivity, easy handling, and inexpensive reagents.
使用铜催化和基于 l-烷基-1H-咪唑的配体系统,用无毒氰化物源六氰基铁酸钾 (II) (K 4 [Fe(CN) 6 ]) 氰化芳基卤化物的通用和环境改进方案是呈现。该系统的优点是底物范围广、选择性高、易于处理和试剂便宜。
A State-of-the-Art Cyanation of Aryl Bromides: A Novel and Versatile Copper Catalyst System Inspired by Nature
A general protocol for the cyanation of aryl halides with the nontoxic cyanide source K4[Fe(CN)6] using copper catalysis and a ligand system based on 1-alkylimidazoles is presented. The advantages of this system are the high selectivity, a unique substrate range, easy handling, and inexpensive reagents.
An improved coppercatalystsystem for the cyanation of heteroaryl halides leading to substituted heteroaryl nitriles is described. The catalystsystem consists of simple Cul and N-alkyl-imidazoles, and mimics known Cu-containing metalloproteins. It is stable, commercially available, cheap and easily tunable. By using inexpensive and non-toxic K 4 [Fe(CN) 6 ] and the novel Cu catalysts we were able
描述了用于使杂芳基卤化物氰化产生取代的杂芳基腈的改进的铜催化剂体系。催化剂系统由简单的 Cu 和 N-烷基咪唑组成,模拟已知的含铜金属蛋白。它稳定、可商用、便宜且易于调整。通过使用廉价且无毒的 K 4 [Fe(CN) 6 ] 和新型 Cu 催化剂,我们能够以高产率和选择性对活化和未活化的杂芳烃进行氰化。该程序的通用性通过各种不同的例子来证明,其中一些在其他已知方法下没有反应。
3-(2-amino-1-azacyclyl)-5-aryl-1,2,4-oxadiazoles as s1p receptor agonists
申请人:Colandrea J. Vincent
公开号:US20060252741A1
公开(公告)日:2006-11-09
The present invention encompasses compounds of Formula (I): as well as the pharmaceutically acceptable salts thereof. The compounds are useful for treating immune mediated diseases and conditions, such as bone marrow, organ and tissue transplant rejection. Pharmaceutical compositions and methods of use are included.