Transition-State Stabilization by a Secondary Substrate-Ligand Interaction: A New Design Principle for Highly Efficient Transition-Metal Catalysis
作者:Tomáš Šmejkal、Denis Gribkov、Jens Geier、Manfred Keller、Bernhard Breit
DOI:10.1002/chem.200902553
日期:2010.2.22
of the library gave some excellent catalysts for regioselective hydroformylation of β,γ‐unsaturated carboxylic acids. A terminal alkene, but‐3‐enoic acid, was hydroformylated with a linear/branched (l/b) regioselectivity up to 41. An internal alkene, pent‐3‐enoic acid was hydroformylated with regioselectivity up to 18:1. Further substrate selectivity (e.g., acid vs. methyl ester) and reaction site
设计了一个单齿膦配体的文库,每个配体带有一个用于羧酸盐的胍受体单元。文库的筛选为β,γ-不饱和羧酸的区域选择性加氢甲酰化提供了一些极好的催化剂。末端烯烃丁-3-烯酸被线性化/支化(l / b)区域选择性加氢甲酰化。内部烯烃戊-3-烯酸被烷基化高达18:1的区域化加氢甲酰化。还实现了进一步的底物选择性(例如,酸对甲酯)和反应位点选择性(2-乙烯基庚-2-烯酸的单官能化)。对结构-活性关系的探索以及实践和理论机制的研究使我们对催化系统中超分子胍盐-羧酸盐相互作用的性质有了深刻的了解。