Dialkylterphenyl Phosphine-Based Palladium Precatalysts for Efficient Aryl Amination of N-Nucleophiles.,Chemistry - A European Journal

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Dialkylterphenyl Phosphine-Based Palladium Precatalysts for Efficient Aryl Amination of N-Nucleophiles.
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2020-01-16 , DOI: 10.1002/chem.201903279
Raquel J Rama ₁ , Celia Maya ₂ , M Carmen Nicasio ₁

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A series of 2-aminobiphenyl palladacycles supported by dialkylterphenyl phosphines, PR2 Ar' (R=Me, Et, iPr, Cyp (cyclopentyl), Ar'=ArDipp2 , ArXyl2f , Dipp (2,6-C6H3-(2,6-C6H3-(CHMe2)2)2), Xyl=xylyl) have been prepared and structurally characterized. Neutral palladacycles were obtained with less bulky terphenyl phosphines (i.e., Me and Et substituents) whereas the largest phosphines provided cationic palladacycles in which the phosphines adopted a bidentate hemilabile k1 -P,η1 -Carene coordination mode. The influence of the ligand structure on the catalytic performance of these Pd precatalysts was evaluated 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 catalyst loadings (0.25-0.75 mol % Pd) and without excess ligand.

中文翻译：

N-Nucleophiles的芳基胺化的二烷基三苯膦基钯预催化剂。

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。

更新日期：2020-01-16

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