Rational Redesign of a Regioselective Hydroformylation Catalyst for 3‐Butenoic Acid by Supramolecular Substrate Orientation
作者:Shao‐Tao Bai、Vivek Sinha、Alexander M. Kluwer、Pim R. Linnebank、Zohar Abiri、Bas Bruin、Joost N. H. Reek
DOI:10.1002/cctc.201900487
日期:2019.11.7
producing the linear aldehyde when substrates were bound in its pocket via hydrogen bonding. However, the distance between the binding site and the rhodium center was too large to also address 3‐butenoic acid and its derivatives. We therefore designed OrthoDIMphos (L2) as new ligand which has a shorter distance between the DIM‐receptor and the catalytic center. The OrthoDIMphos (L2) based catalyst displays
区域选择性转化配体的合理设计是过渡金属催化领域长期追求的目标之一。在当前的贡献中,我们报告了OrthoDIMphos(L2),这是一种专为3-丁烯酸及其衍生物的区域选择性加氢甲酰化而设计的配体。当底物通过氢键结合在其口袋中时,先前报道的基于ParaDIMphos(L1)的加氢甲酰化催化剂会非常有选择地产生线性醛。但是,结合位点和铑中心之间的距离太大,无法同时处理3-丁烯酸及其衍生物。因此,我们设计了OrthoDIMphos(L2)作为新的配体,在DIM受体和催化中心之间的距离更短。基于OrthoDIMphos(L2)的催化剂在3-丁烯酸的加氢甲酰化反应中具有很高的区域选择性,并且具有挑战性的内部烯烃类似物(l / b高达84,TON高达630),这是ParaDIMphos(L1)催化剂无法实现的。详细的研究表明,基于OrthoDIMphos(L2)的催化剂形成了二聚体结构,其中两个配体与两