Dialkylterphenyl Phosphine‐Based Palladium Precatalysts for Efficient Aryl Amination of
<i>N</i>
‐Nucleophiles
作者:Raquel J. Rama、Celia Maya、M. Carmen Nicasio
DOI:10.1002/chem.201903279
日期:2020.1.22
in aryl amination reactions. Cationic complexes bearing the phosphines PiPr2 ArXyl2 and PCyp2 ArXyl2 were the most active of the series. These precatalysts have demonstrated a high versatility and efficiency in the coupling of a variety of nitrogen nucleophiles, including secondary amines, alkyl amines, anilines, and indoles, with electronically deactivated and ortho-substituted aryl chlorides at low
由二烷基三联苯膦,PR2 Ar'(R = Me,Et,iPr,Cyp(环戊基),Ar'= ArDipp2,ArXyl2f,Dipp(2,6-C6H3-(2,6-C6H3 -(CHMe 2)2)2),Xyl =二甲苯基)已经制备并在结构上表征。获得具有较小体积的三联苯膦(即Me和Et取代基)的中性Palladacycles,而最大的膦则提供了阳离子Palladacycles,其中膦采用了双齿半键k1-P,η1-Carene配位模式。在芳基胺化反应中评价了配体结构对这些Pd预催化剂催化性能的影响。带有膦基PiPr2 ArXyl2和PCyp2 ArXyl2的阳离子配合物是该系列中活性最高的。