The combination of ZnEt2 and chiral pyridinebisoxazoline (pybox) or pyridinebisimidazoline (pybim) ligands catalyzed the asymmetric hydrosilylation of aryl, alkyl, cyclic, heterocyclic, and aliphatic ketones. Under mild conditions, high yields and good enantioselectivities were achieved. ESI measurements allowed for the characterization of the active catalyst.
[EN] CHIRAL METAL COMPLEX COMPOUNDS<br/>[FR] COMPOSÉS COMPLEXES MÉTALLIQUES CHIRAUX
申请人:HOFFMANN LA ROCHE
公开号:WO2018189060A1
公开(公告)日:2018-10-18
The invention comprises novel chiral metal complex compounds of the formula (I) wherein M, PR2, R3 and R4 are outlined in the description, its stereoisomers, in the form as a neutral complex or a complex cation with a suitable counter ion. The chiral metal complex compounds can be used in asymmetric reactions, particularly in asymmetric reductions of ketones, imines or oximes.
The asymmetricringopeningreaction of 1,2-(N-acylimino)cyclohexanes (N-acylaziridines) with some thiols proceeded in the presence of chiral zinc complexes prepared from diethylzinc and dialkyl L-(+)-tartrate to afford trans 2-(N-acylamino)-1-arylthiocyclohexane in up to 93% ee. The enantioselectivity is highly influenced by the molar ratio of the reactants and the nature of chiraldialkyl tartrate
在由二乙基锌和L-(+)-酒石酸二烷基酯制备的手性锌络合物的存在下,进行1,2-(N-酰基亚氨基)环己烷(N-酰基环丙啶)与一些硫醇的不对称开环反应,得到反式2-(N-酰基氨基)-1-芳基硫代环己烷的ee最高可达93%。对映选择性很大程度上受反应物的摩尔比和手性酒石酸二烷基酯的性质的影响。L-(+)-酒石酸锌-二烷基络合物的化学结构通过1 H NMR光谱和分子量进行了讨论。
Manganese(I)-Catalyzed Enantioselective Hydrogenation of Ketones Using a Defined Chiral PNP Pincer Ligand
A new chiral manganese PNP pincercomplex is described. The asymmetric hydrogenation of several prochiral ketones with molecular hydrogen in the presence of this complex proceeds under mild conditions (30–40 °C, 4 h, 30 bar H2). Besides high catalytic activity for aromatic substrates, aliphatic ketones are hydrogenated with remarkable selectivity (e.r. up to 92:8). DFT calculations support an outer
描述了一种新的手性锰PNP钳复合物。在温和的条件下(30–40°C,4 h,30 bar H 2),在这种配合物的存在下,几种前手性酮与分子氢的不对称氢化反应。除了对芳族底物具有高催化活性外,脂族酮还具有显着的选择性(高达92:8)氢化。DFT计算支持外球氢化机理以及实验确定的立体化学。
A recyclable Mn–porphyrin catalyst for enantioselective epoxidation of unfunctionalized olefins using molecular dioxygen
作者:Afsaneh Farokhi、Hassan Hosseini-Monfared
DOI:10.1039/c6nj00808a
日期:——
A highly efficient green process for the asymmetricepoxidation of olefins by an easy to synthesise Mn–porphyrin and O2/aldehyde is reported.