Functional-Group-Tolerant, Nickel-Catalyzed Cross-Coupling Reaction for Enantioselective Construction of Tertiary Methyl-Bearing Stereocenters
作者:Hanna M. Wisniewska、Elizabeth C. Swift、Elizabeth R. Jarvo
DOI:10.1021/ja4034999
日期:2013.6.19
The first Negishi nickel-catalyzed stereospecific cross-coupling reaction of secondary benzylic esters is reported. A series of traceless directing groups is evaluated for ability to promote cross-coupling with dimethylzinc. Esters with a chelating thioether derived from commercially available 2-(methylthio)acetic acid are most effective. The products are formed in high yield and with excellent stereospecificity
Pd-Catalyzed Arylation of 1,2-Amino Alcohol Derivatives via β-Carbon Elimination
作者:Miquel A. Pericàs、Ruben Martin、Miriam Sau
DOI:10.1055/a-1699-4766
日期:2022.1
AbstractHerein, we describe a Pd-catalyzed arylation of 1,2-amino alcohols with aryl halides enabled by a retroallylation manifold. This protocol constitutes a new entry point to β-arylated aldehydes via the intermediacy of in situ generated enamine intermediates. The protocol is characterized by its exquisite regioselectivity profile and broad substrate scope – including challenging substrate combinations
Design and Application of Hybrid Phosphorus Ligands for Enantioselective Rh-Catalyzed Anti-Markovnikov Hydroformylation of Unfunctionalized 1,1-Disubstituted Alkenes
作者:Cai You、Shuailong Li、Xiuxiu Li、Jialing Lan、Yuhong Yang、Lung Wa Chung、Hui Lv、Xumu Zhang
DOI:10.1021/jacs.8b00275
日期:2018.4.18
series of novel hybrid phosphorus ligands were designed and applied to the Rh-catalyzed enantioselective anti-Markovnikov hydroformylation of unfunctionalized 1,1-disubstituted alkenes. By employing the new catalyst, linear aldehydes with β-chirality can be prepared with high yields and enantioselectivities under mild conditions. Furthermore, catalyst loading as low as 0.05 mol % furnished the desired
A Novel Organocatalytic Asymmetric Transfer Hydrogenation of<i>α</i>,<i>β</i>-Unsaturated Aldehydes
作者:Bao-Hua Zhang、Lan-Xiang Shi、Rui-Xia Guo
DOI:10.1002/hlca.201300029
日期:2013.11
α,β‐Unsaturated aldehydes reacted with diimide (diazene) in the presence of optically active ammonium salt 1 as a catalyst to give the corresponding saturated aldehydes in excellent yields and up to 98 : 2 er. Attractive features of the asymmetric transferhydrogenation are its high yields, and chemo‐, and enantioselectivities.
Direct organocatalytic asymmetric reductive Mannich-type reactions
作者:Gui-Ling Zhao、Armando Córdova
DOI:10.1016/j.tetlet.2006.08.063
日期:2006.10
A direct asymmetric reductive Manich-type reaction that allows for the formation of three contiguous stereocenters with high chemo-, diastereo-, and enantio selectivity is presented. (c) 2006 Elsevier Ltd. All rights reserved.