Chiral Brønsted Acid from a Cationic Gold(I) Complex: Catalytic Enantioselective Protonation of Silyl Enol Ethers of Ketones
作者:Cheol Hong Cheon、Osamu Kanno、F. Dean Toste
DOI:10.1021/ja204331w
日期:2011.8.31
developed from a cationic gold(I) disphosphine complex in the presence of alcoholic solvent and applied to the enantioselective protonation reaction of silylenolethers of ketones. Various optically active cyclic ketones were obtained in excellent yields and high enantioselectivities, including cyclic ketones bearing aliphatic substrates at the α-position. Furthermore, the application of this Brønsted acid
Catalytic Asymmetric Cross-Couplings of Racemic α-Bromoketones with Arylzinc Reagents
作者:Pamela M. Lundin、Jorge Esquivias、Gregory C. Fu
DOI:10.1002/anie.200804888
日期:2009.1
Nickel box: The first catalytic asymmetric method for cross‐coupling arylzinc reagents with α‐bromoketones has been developed (see scheme). This stereoconvergent carbon–carbon bond‐forming process occurs under unusually mild conditions and without activators, thereby allowing the generation of potentially labile tertiary stereocenters.