<i>C</i><sub>1</sub>-Symmetric Oxazolinyl Sulfoximines as Ligands in Copper-Catalyzed Asymmetric Mukaiyama Aldol Reactions
作者:Jörg Sedelmeier、Tim Hammerer、Carsten Bolm
DOI:10.1021/ol703065x
日期:2008.3.1
Aryl-bridged C1-symmetric oxazolinyl sulfoximines are applicable in copper-catalyzedasymmetricMukaiyamaaldolreactions with methyl pyruvate. The resulting alpha-hydroxy esters have been obtained with up to 94% ee in good yields. They contain a quaternary stereogenic center and represent valuable precursors for biologically active molecules.
VinylogousMukaiyama‐type aldolreactions have been catalyzed by a combination of Cu(OTf)2 and readily available C1‐symmetric aminosulfoximines. After a fine‐tuning of the reaction conditions and an optimization of the modularly assembled ligand structure, high stereoselectivities and excellent yields have been achieved in catalyzed reactions involving various electrophile/nucleophile combinations
Synthesis of Sulfoximine-Derived P,N Ligands and their Applications in Asymmetric Quinoline Hydrogenations
作者:Sheng-Mei Lu、Carsten Bolm
DOI:10.1002/adsc.200800068
日期:2008.5.5
A series of naphthalene-bridged P,N-type sulfoximine ligands and their iridium complexes have been synthesized. They were applied in the enantioselective hydrogenation of quinoline derivatives, and enantioselectivities up to 92% ee have been achieved in the hydrogenation of 2-methylquinoline.