Impact of Steric Blocking on Diastereoselective C−H Activation of Ethylbenzene by Cationic Platinum(II) Complexes with 7-Azaindolyl Derivative Ligands
作者:Shu-Bin Zhao、Gang Wu、Suning Wang
DOI:10.1021/om0608861
日期:2006.12.1
the regio- and diastereoselectivity of the ethylbenzene C−H activation has been investigated. For both Pt complexes the benzylic C−H activation products were found to be thermodynamically favored, with the BAB complex showing a higher regioselectivity. In addition, both complexes display distinct diastereoselectivity in the formation of the η1-benzylic products [Pt(BAB)(CH3CN)(CH(Me)Ph)][BAr‘4] (3)
使用阳离子化合物[Pt(BAB)(CH 3)(L)] +和[Pt(BAM)(CH 3)(L)] +通过[[Et 2 O)2 H] [巴” 4 ]与母体分子的Pt(BAB)(CH 3)2(1)和Pt(BAM)(CH 3)2(2),分别,已检查(BAB = 1, 2-双(N -7-氮杂吲哚基)苯,BAM =双(N-7-氮杂吲哚基甲烷)。研究了BAB和BAM配体对Pt轴向配位位阻的空间位阻对乙苯CH活化的区域和非对映选择性的影响。对于两种Pt配合物,发现苄基CH活化产物在热力学上都是有利的,而BAB配合物显示出更高的区域选择性。此外,这两种复合物显示在η的形成非对映选择性明显1个-benzylic产品[PT(BAB)(CH 3 CN)(CH(Me)的PH)] [巴” 4 ](3)和[PT(BAM) (CH 3 CN)(CH(Me)的PH)] [巴” 4 ](4),而BAB配合物表现出更高的非对映