Asymmetric Rhodium-Catalyzed 1,4- and 1,2-Additions of Arylboronic Acids to Activated Ketones in Water at Room Temperature Using a Mixed Sulfur-Olefin Ligand
system we have also developed the first addition of boronic acids to the more challenging α‐keto carbonylcompounds in water, affording tertiary carbinols with high yields and high enantioselectivities. Beside the mild conditions used, the reported processes use as catalyst precursor the robust sulfinamido‐olefin mixed ligand 1 obtained on a multigram scale and in one step from a sugar‐derived sulfinate
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
Rh(I)-Catalyzed Asymmetric 1,2-Addition to α-Diketones with Chiral Sulfur–Alkene Hybrid Ligands
作者:Xiangqing Feng、Yanzhao Nie、Jing Yang、Haifeng Du
DOI:10.1021/ol203238j
日期:2012.1.20
This paper describes a Rh(I)-catalyzed highly efficient and enantioselective1,2-addition of arylboronic acids to α-diketones with the use of a simple sulfur–alkene hybrid ligand. With as low as a 0.1 mol % catalyst loading, a variety of optically active α-hydroxyketones can be furnished in high yields with excellent ee’s.
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 %.