Retracted: The Manganese(I)‐Catalyzed Asymmetric Transfer Hydrogenation of Ketones: Disclosing the Macrocylic Privilege
作者:Alessandro Passera、Antonio Mezzetti
DOI:10.1002/anie.201912605
日期:2020.1.2
The bis(carbonyl) manganese(I) complex [Mn(CO)2 (1)]Br (2) with a chiral (NH)2 P2 macrocyclic ligand (1) catalyzes the asymmetrictransferhydrogenation of polar double bonds with 2-propanol as the hydrogen source. Ketones (43 substrates) are reduced to alcohols in high yields (up to >99 %) and with excellent enantioselectivities (90-99 % ee). A stereochemical model based on attractive CH-π interactions
Iridium-Catalyzed Asymmetric Hydrogenation of Ketones with Accessible and Modular Ferrocene-Based Amino-phosphine Acid (f-Ampha) Ligands
作者:Jianfei Yu、Jiao Long、Yuhong Yang、Weilong Wu、Peng Xue、Lung Wa Chung、Xiu-Qin Dong、Xumu Zhang
DOI:10.1021/acs.orglett.6b03862
日期:2017.2.3
A series of tridentate ferrocene-based amino-phosphine acid (f-Ampha) ligands have been successfully developed. The f-Ampha ligands are extremely air stable and exhibited excellent performance in the Ir-catalyzed asymmetric hydrogenation of ketones (full conversions, up to >99% ee, and 500 000 TON). DFT calculations were performed to elucidate the reaction mechanism and the importance of the −COOH
A Cobalt(II) Complex Bearing the Amine(imine)diphosphine PN(H)NP Ligand for Asymmetric Transfer Hydrogenation of Ketones
作者:Shangfei Huo、Hong Chen、Weiwei Zuo
DOI:10.1002/ejic.202000826
日期:2021.1.8
containing bis(amine)diphosphine PN(H)N(H)P ligand were synthesized. The structures of two complexes were characterized by X‐ray crystallography and high resolution mass spectrometry. The catalytic performances of cobalt complexes a and b for asymmetric transferhydrogenation (ATH) of ketones under mild conditions were evaluated using 2‐propanolisopropanol as solvent and hydrogen source after being activated
Because most pharmacologically active receptors are inherently asymmetric, the introduction of asymmetry into molecules that can bind to such receptors is a central topic in modern organic and bioorganic chemistry. We developed a metal charge-directed stereoinduction process in the asymmetrictransferhydrogenation of ketones catalyzed by first-row transition-metal (iron, cobalt, and nickel) amido
Kinetic Resolution of Secondary Alcohols Using Amidine-Based Catalysts
作者:Ximin Li、Hui Jiang、Eric W. Uffman、Lei Guo、Yuhua Zhang、Xing Yang、Vladimir B. Birman
DOI:10.1021/jo202220x
日期:2012.2.17
Kinetic resolution of racemic alcohols has been traditionally achieved via enzymatic enantioselective esterification and ester hydrolysis. However, there has long been considerable interest in devising nonenzymatic alternative methods for this transformation. Amidine-based catalysts (ABCs), a new class of enantioselective acyl transfer catalysts developed in our group, have demonstrated, inter alia, high efficacy in the kinetic resolution of benzylic, allylic, and propargylic secondary alcohols and 2-substituted cycloalkanols, and thus provide a viable alternative to enzymes.