[EN] TRANSITION METAL COMPLEXES FOR ENANTIOSELECTIVE CATALYSIS OF CARBON-CARBON, CARBON-HETEROATOM, AND CARBON-HYDROGEN BOND FORMING REACTIONS [FR] COMPLEXES DE MÉTAL DE TRANSITION POUR LA CATALYSE ÉNANTIOSÉLECTIVE DE RÉACTIONS DE FORMATION DE LIAISONS CARBONE-CARBONE, CARBONE-HÉTÉROATOME ET CARBONE-HYDROGÈNE
Asymmetric Transfer Hydrogenation of Aromatic Ketones Catalyzed by New Chiral C2-Symmetric Bis(sulfonyl) tetraaza Ligands Complexed with [Ru(η 6-p-cymene)Cl2]2 in Water
作者:Xungao Liu、Tian Zhang、Yingying Hu、Liang Shen
DOI:10.1007/s10562-014-1254-0
日期:2014.7
and steric effects of the substituents on ligands and substrates.Graphical Abstract A new series of C2-symmetric bis(sulfonyl) tetraaza ligands was synthesized from (1S,2S)-1,2-diarylethylenediamine analogues and tested in the asymmetrictransferhydrogenation of aromatic ketones by complexing with [Ru(η6-p-cymene)Cl2]2 employing formate sodium as hydrogen source in neat water. A moderate to excellent
Enantioselective Synthesis of (S)-γ-Amino Alcohols by Ru/Rh/Ir Catalyzed Asymmetric Transfer Hydrogenation (ATH) with Tunable Chiral Tetraaza Ligands in Water
Abstract(R/S)-γ-Amino alcohols are the key intermediates for the preparation of Fluoxetine, Atomoxetine, Nisoxetine and Duloxetine. In this paper, we describe an effective method to obtain (S)-γ-amino alcohols by Ru/Rh/Ir catalyzedasymmetric transfer hydrogenation with tunable chiral tetraaza ligands (L1–L5) in HCOONa/H2O system. The asymmetric reduction of acetophenone with [Ru(p-cymene)Cl2]2/L1
Modulation of the reactivity, stability and substrate- and enantioselectivity of an epoxidation catalyst by noncovalent dynamic attachment of a receptor functionality—aspects on the mechanism of the Jacobsen–Katsuki epoxidation applied to a supramolecular system
作者:Stefán Jónsson、Fabrice G. J. Odille、Per-Ola Norrby、Kenneth Wärnmark
DOI:10.1039/b518244a
日期:——
The synthesis of the components of the dynamic supramolecular hydrogen-bonded catalytic system 2 + 3 is described. The catalytic performance and substrate- and enantioselectivity of Mn(salen) catalyst 2 were investigated in the presence and absence of the Zn(porphyrin) receptor unit 3. The effects of pyridine and pyridine N-oxide donor ligands were also studied. Some aspects on the mechanism of the
作者:Si Joon Park、In-Soo Hwang、Young Jun Chang、Choong Eui Song
DOI:10.1021/jacs.0c11815
日期:2021.2.17
hemithioacetals which proceeds viaenantioselective protonation of an ene-diol intermediate. The use of on-water condition turns on this otherwise extremely unreactive catalytic reaction as a result of the strengthened hydrogen bonds of water molecules near the hydrophobic reaction mixture. Furthermore, under on-water conditions, especially under biphasic microfluidic on-water conditions, access of bulk water into
水中前手性碳负离子的催化对映选择性质子化是生物系统中的一种常见转化,但由于质子在水中异常快速的运动会导致不受控制的外消旋质子化,因此这超出了合成化学家的能力。在这里,我们展示了水的关键作用,它能够通过烯二醇中间体的对映选择性质子化进行半硫缩醛的高度对映选择性乙二醛酶 I 模拟催化异构化。由于疏水反应混合物附近的水分子的氢键增强,因此水上条件的使用开启了这种原本极其不活泼的催化反应。此外,在水上条件下,特别是在双相微流体水上条件下,
Enantio- and Diastereoselective Betti/aza-Michael Sequence: Single Operated Preparation of Chiral 1,3-Disubstituted Isoindolines
作者:Shinobu Takizawa、Makoto Sako、Mohamed Ahmed Abozeid、Kenta Kishi、H. D. P. Wathsala、Shuichi Hirata、Kenichi Murai、Hiromichi Fujioka、Hiroaki Sasai
DOI:10.1021/acs.orglett.7b02693
日期:2017.10.6
using a C3-symmetric chiral trisimidazoline organocatalyst is reported. The reaction of phenols and N-tosylimines bearing a Michael acceptor moiety afforded densely functionalized 1,3-disubstituted isoindolines bearing two stereogenic centers as single diastereomers in high yields (≤93%) and excellent enantioselectivities (≤99.9%).