Donor-activated alkali metal dipyridylamides: co-complexation reactions with zinc alkyls and reactivity studies with benzophenone
作者:David R. Armstrong、Etienne V. Brouillet、Alan R. Kennedy、Jennifer A. Garden、Markus Granitzka、Robert E. Mulvey、Joshua J. Trivett
DOI:10.1039/c4dt00914b
日期:——
[(TMEDA)Na(μ-dpa)]2 led to tert-butylation of benzophenone at the challenging para-position, where the sodium amide functions as a metalloligand towards tBu2Zn manifested in crystalline [(TMEDA)Na(dpa)}2ZntBu2] (TMEDA is N,N,N′,N′-tetramethylethylenediamine, dpa is 2,2′-dipyridylamide). Here we find altering the Lewis donor or alkali metal within the metalloligand dictates the reaction outcome, exhibiting a strong
以前有报道说,[(TMEDA)Na(μ-dpa)] 2活化t Bu 2 Zn导致二苯甲酮在具有挑战性的对位发生叔丁基化,其中氨基钠起着对t Bu 2的金属配体的作用。Zn以晶体[(TMEDA)Na(dpa)} 2 Zn t Bu 2 ](TMEDA为N,N,N ',N′-四甲基乙二胺,dpa是2,2′-二吡啶基酰胺)。在这里,我们发现改变金属配体中的路易斯供体或碱金属决定了反应结果,对烷基化收率和反应选择性产生了强烈影响。改变前者导致合成了三种新型复合物,[(PMDETA)Na(dpa)] 2,[(TMDAE)Na(dpa)] 2和[(H 6 -TREN)Na(dpa)],其特征在于结合结构,光谱和理论研究[其中PMDETA为N,N,N ',N '',N ''-五甲基二亚乙基三胺,TMDAE为N,N,N ',N′-四甲基二氨基乙基醚和H 6 -TREN是N ′,N′-双(2-氨基乙基)乙