Manganese-Catalyzed Hydroboration of Terminal Olefins and Metal-Dependent Selectivity in Internal Olefin Isomerization–Hydroboration
作者:Subhash Garhwal、Asja A. Kroeger、Ranjeesh Thenarukandiyil、Natalia Fridman、Amir Karton、Graham de Ruiter
DOI:10.1021/acs.inorgchem.0c03451
日期:2021.1.4
In the past decade, the use of earth-abundant metals in homogeneous catalysis has flourished. In particular, metals such as cobalt and iron have been used extensively in reductive transformations including hydrogenation, hydroboration, and hydrosilylation. Manganese, on the other hand, has been considerably less explored in these reductive transformations. Here, we report a well-defined manganese complex
在过去的十年中,在均相催化中使用了富含地球的金属。特别地,诸如钴和铁的金属已广泛用于包括氢化,硼氢化和氢化硅烷化的还原转化中。另一方面,在这些还原性转变中对锰的研究较少。在这里,我们报告了一种定义明确的锰络合物[Mn(i Pr BDI)(OTf)2 ](2a; BDI =联吡啶二胺),是多种电子分化烯烃的硼氢化反应中的活性预催化剂(> 20个实例)。加氢硼化对末端烯烃具有特别的选择性,并且具有排他的反马尔科夫尼科夫选择性。相反,当使用类似的钴络合物[Co(i Pr BDI)(OTf)2 ](3a)时,内部烯烃被高效硼氢化,其中一系列异构化步骤最终导致其硼氢化。通过计算研究了锰和钴的对比末端烯烃对内部烯烃的选择性,并在本文报告的研究中作了进一步讨论。