作者:Liu, Shihan、Yang, Haobo、Wang, Ya-Nan、Zhao, Qiaoqiao、Wang, Yujie、Bai, Ruopeng、Liu, Qiang、Lan, Yu
DOI:10.1021/jacs.4c02096
日期:——
investigated the role of aluminum cations in facilitating hydride transfer during the hydrogenation of imines within the context of Noyori-type metal–ligand cooperative catalysis. We propose a novel model involving aluminum cations directly coordinated with imines to induce activation from the lone pair electron site, a phenomenon termed σ-induced activation. The aluminum metal-hydride amidate complex
在这项研究中,我们研究了野依型金属-配体协同催化过程中铝阳离子在亚胺氢化过程中促进氢化物转移的作用。我们提出了一种新模型,涉及铝阳离子直接与亚胺配位以诱导孤对电子位点的激活,这种现象称为σ诱导激活。与锂对应物(“HMn-NLi”)相比,金属氢化物酰胺化铝络合物(“HMn-NAl”)在亚胺氢化中表现出更高的氢化物转移能力。密度泛函理论(DFT)计算表明,铝阳离子在氢化物转移过渡态下通过σ电子诱导的活化有效地极化不饱和键,从而更有效地增强基质的亲电性。此外,在基质配位时,铝的配位饱和通过Al-H配位键的断裂提高了HMn-NAl络合物的氢化物亲核性。