Magnetically Retrievable Nano Crystalline Nickel Ferrite- Catalyzed Aerobic, Ligand-Free CN, CO and CC Cross- Coupling Reactions for the Synthesis of a Diversified Library of Heterocyclic Molecules
作者:Sanjay Paul、Koyel Pradhan、Sirshendu Ghosh、S. K. De、Asish R. Das
DOI:10.1002/adsc.201300686
日期:2014.4.14
A new nickel ferrite nano‐crystal‐catalyzed, ligand‐free strategy for the construction of CN, CO, and CC bonds is presented, in which easily available nitrogen and oxygen nucleophiles, aryl/heteroaryl halides and arylboronic acids are used for the cross‐coupling reactions. The reactions can be performed at low catalyst loadings with excellent functional group tolerance and chemoselectivity. A variety
提出了一种新的镍铁氧体纳米晶催化,无配体的CN,CO和CC键构建策略,其中容易获得的氮和氧亲核试剂,芳基/杂芳基卤化物和芳基硼酸用于交叉偶联反应。该反应可以在低催化剂负载下以优异的官能团耐受性和化学选择性进行。各种官能团均与反应条件兼容,包括硝基,甲氧基以及对酸和碱敏感的杂芳族基团。这种前所未有的化学性质很好地补充了胺/杂胺(O)的N-芳基化的经典方法酚/羟基香豆素和联芳基/杂芳基的芳基化反应。低成本,易于处理的性质以及该催化系统的简单性使得该方法可与需要复杂配体存在的基于铜和钯的可比方案竞争。通过简单的水热法制备了镍铁氧体磁性纳米粒子,并通过XRD,TEM图像,能量色散X射线分析,XPS和FT-IR对其进行了表征。催化剂的容易回收和产物的高收率使得该方案具有吸引力,可持续性和经济性。将该催化剂再利用五个循环,其催化活性几乎保持不变。