Application of a Chiral Scaffolding Ligand in Catalytic Enantioselective Hydroformylation
作者:Amanda D. Worthy、Candice L. Joe、Thomas E. Lightburn、Kian L. Tan
DOI:10.1021/ja107433h
日期:2010.10.27
The synthesis of β-amino-aldehydes has been achieved through enantioselective hydroformylation of PMP-protected allylic amines. The reaction is accomplished by using a scalemic scaffolding ligand that covalently and reversibly binds to the substrate. These ligands behave like chiral auxiliaries because they are covalently attached to the substrate during hydroformylation; however, similar to traditional
β-氨基醛的合成是通过 PMP 保护的烯丙胺的对映选择性加氢甲酰化来实现的。该反应是通过使用与底物共价可逆结合的鳞片支架配体来完成的。这些配体的行为类似于手性助剂,因为它们在加氢甲酰化过程中共价连接到底物上;然而,与传统的不对称配体类似,它们可以以催化量使用。二取代烯烃的直接加氢甲酰化在温和条件(35 °C 和 50 psi CO/H(2))下进行,Z-烯烃具有优异的对映选择性(高达 93% ee)。