Phenyl Backbone-Derived P,O- and P,N-Ligands for Palladium/Ligand-Catalyzed Aminations of Aryl Bromides, Iodides, and Chlorides. Syntheses and Structures of (P,O)<i><sub>n</sub></i>-Palladium(II)Aryl(Br) Complexes
作者:Xiaohong Bei、Tetsuo Uno、Jeff Norris、Howard W. Turner、W. Henry Weinberg、Anil S. Guram、Jeffrey L. Petersen
DOI:10.1021/om9900162
日期:1999.5.1
palladium/ligand-catalyzed aryl aminations. The P,O-ligands 2-(2‘-diphenylphosphinophenyl)-2-methyl-1,3-dioxolane (1) and 2-(2‘-dicyclohexylphosphinophenyl)-2-methyl-1,3-dioxolane (6) in combination with Pd(dba)2afford active catalysts for general aminations of aryl bromides, iodides, and chlorides. The Pd/ligand 6 catalyst, in particular, is efficient for general aminations of aryl chlorides. But the structurally
苯基骨架衍生的P,O-和P,N的化合物1 - 10进行了调查它们的效用,如钯/配体催化的芳基胺化的配体。P,O-配体2-(2'-二苯基膦基苯基)-2-甲基-1,3-二氧戊环(1)和2-(2'-二环己基膦基苯基)-2-甲基-1,3-二氧戊环(6)与Pd(dba)2的结合提供了用于芳基溴化物,碘化物和氯化物的一般胺化的活性催化剂。特别是,Pd /配体6催化剂对于芳基氯化物的一般胺化是有效的。但是与结构相关的配体2-(2'-二苯基膦基苯基)-1,3-二氧戊环(2)和其他P,O-或P,N-配体效果较差。Pd(dba)的反应2,多余的4-吨卜-C 6 H ^ 4 Br和过量配体(1,6,2)或PD [P(配体置换反应ö -toluyl)3 ](4-吨卜-C 6 H ^ 4)(μ-溴)} 2与配体1,6,和2得到的Pd的电位催化中间体/ L催化(L = 1,6,2)芳基胺化,即,LPD( 4吨Bu-C