Chiral-at-metal iridium complex for efficient enantioselective transfer hydrogenation of ketones
作者:Cheng Tian、Lei Gong、Eric Meggers
DOI:10.1039/c6cc00972g
日期:——
A bis-cyclometalated iridium(III) complex with metal-centered chirality catalyzes the enantioselectivetransferhydrogenation of ketones with high enantioselectivities at low catalyst loadings down to 0.002 mol%. Importantly, the rate of catalysis...
Enantioselective addition of organozinc reagents to carbonyl compounds catalyzed by a camphor derived chiral γ-amino thiol ligand
作者:Hsyueh-Liang Wu、Ping-Yu Wu、Ying-Ni Cheng、Biing-Jiun Uang
DOI:10.1016/j.tet.2015.07.038
日期:2016.5
synthesis of the chiral camphor derived γ-amino thiol ligand 17 and its application in catalytic enantioselective carbon-carbon forming reactions through the addition of organozinc reagents to carbonyl compounds is described. The catalytic activity and enantioselectivity of ligand 17 is demonstrated in the enantioselective addition of various organozinc reagents to aldehydes and ketoesters, offering the corresponding
Enantioselective Addition of Dialkylzincs to Aldehydes Catalyzed by (−)-MITH
作者:Ying-Ni Cheng、Hsyueh-Liang Wu、Ping-Yu Wu、Ying-Ying Shen、Biing-Jiun Uang
DOI:10.1002/asia.201200676
日期:2012.12
imparts high enantioselectivity has been disclosed for the synthesis of optically active alcohols, which may undergo further chemical transformations. The enantioselective alkylation of aldehydes with dialkylzincs to afford the corresponding optically active alcohols with excellent enantioselectvities has been achieved in the presence of 0.1–0.5 mol % of the camphor‐derived chiral ligand (−)‐2‐exo
Third-Generation Amino Acid Furanoside-Based Ligands from <scp>d</scp>
-Mannose for the Asymmetric Transfer Hydrogenation of Ketones: Catalysts with an Exceptionally Wide Substrate Scope
A modular ligand library of α‐amino acid hydroxyamides and thioamides was prepared from 10 different N‐tert‐butyloxycarbonyl‐protected α‐amino acids and three different amino alcohols derived from 2,3‐O‐isopropylidene‐α‐d‐mannofuranoside. The ligand library was evaluated in the half‐sandwich ruthenium‐ and rhodium‐catalyzed asymmetric transfer hydrogenation of a wide array of ketone substrates, including
Iron(ii)–bis(isonitrile) complexes: novel catalysts in asymmetric transfer hydrogenations of aromatic and heteroaromatic ketones
作者:Anu Naik、Tapan Maji、Oliver Reiser
DOI:10.1039/c0cc00508h
日期:——
Chiral iron(ii)-bis(isonitrile) complexes catalyse the transferhydrogenation of aromatic ketones with enantioselectivities up to 91% ee, most likely via hydride transfer through imine intermediates, generated by in situ reduction of the isonitrile ligands, whereas iron acts as a Lewis acid to activate the ketone.