The influence of the nature of phosphine ligand on palladium catalysts for cross-coupling of weakly nucleophilic potassium pentafluorophenyltrifluoroborate with ArHal and PhCH2Hal (Hal=Br, Cl)
作者:Anton Yu. Shabalin、Nicolay Yu. Adonin、Vadim V. Bardin、Valentin N. Parmon
DOI:10.1016/j.tet.2014.04.019
日期:2014.6
the nature of bulky phosphines used as ligands. As a result, conditions for involving the electron-deficient organoboron reagent—potassium pentafluorophenyltrifluoroborate—in the palladium-catalyzed cross-coupling with aryl bromides and aryl chlorides were identified. It was demonstrated that the chosen conditions are appropriate for the reaction of K[C6F5BF3] with benzyl chloride and benzyl bromide
研究了配体性质对钯催化剂催化弱亲核性五氟苯基三氟硼酸钾与偶合芳族卤化物ArHal(Hal = Br,Cl)的行为的模仿,该反应亲和力弱的亲核五氟苯基三氟硼酸钾的行为。发现由Pd(OAc)2和合适的含磷配体原位产生的催化剂的活性和反应选择性取决于用作配体的大膦的性质。结果,确定了在钯催化的与芳基溴化物和芳基氯化物的交叉偶联中涉及缺电子的有机硼试剂(五氟苯基三氟硼酸钾)的条件。结果表明,所选择的条件适合于K [C 6F 5 BF 3 ]与苄基氯和苄基溴衍生的五氟苯基芳基甲烷,C 6 F 5 CH 2 Ar。