Rhodium-Catalyzed, Highly Enantioselective 1,2-Addition of Aryl Boronic Acids to α-Ketoesters and α-Diketones Using Simple, Chiral Sulfur-Olefin Ligands
作者:Ting-Shun Zhu、Shen-Shuang Jin、Ming-Hua Xu
DOI:10.1002/anie.201106972
日期:2012.1.16
best: The title reaction has been achieved by asymmetric rhodium catalysis employing an extremely simple, chiral N‐(sulfinyl)cinnamylamine ligand. A variety of highly enantioenriched, tertiary α‐hydroxy carbonyl derivatives were easily accessed at room temperature under mild conditions with enantioselectivities of up to 99 %.
An enantioselective addition of arylboronic acids and α‐ketoesters promoted by a Rhodium(I)‐chiral diene catalyst is reported. The transformation proceeds regioselectively in the presence of as low as 0.5 mol% of the catalyst generated in situ from a Rhodium(I) salt and diene L1, which is a bicyclo[2.2.1] ligand scaffold bearing 2,5 dinaphthyl substituents, to afford tertiary chiral α‐hydroxy esters