Synthesis of an enantiomerically pure aminoisoquinocarbazole with antiarrhythmic activity via lipase-catalyzed enantioselective transesterification
摘要:
Enantiomerically pure (R)-2-cydohexen-1-ol 5 was prepared via lipase-catalyzed enantioselective transesterification of 2-substituted cyclohexanol, and stereospecifically converted to (-)-(2-cyclohexenyl)acetic acid 4. Enantiomerically pure aminoisoquinocarbazole 1 (RS-2135) was synthesized stereoselectively from 4, using an intramolecular Dids-Alder reaction and Curtius rearrangement. Copyright (C) 1996 Elsevier Science Ltd
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.
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.
Metal(II)<i>d</i>-Tartrates Catalyzed Asymmetric Ring Opening of Oxiranes with Various Nucleophiles
作者:Hiroyuki Yamashita
DOI:10.1246/bcsj.61.1213
日期:1988.4
The asymmetricringopening of meso-2,3-disubstituted oxiranes with thiols, aniline, and trimethylsilyl azide was studied by the use of metal(II) d-tartrates as heterogeneous chiral Lewis acid catalysts. The enantioselectivity varied widely with the combination of oxirane, nucleophile, and metal(II) d-tartrate, and Zn(II) d-tartrate gave the best enantioselectivity in the respective reactions of 1
通过使用金属 (II) d-酒石酸盐作为非均相手性路易斯酸催化剂,研究了具有硫醇、苯胺和三甲基甲硅烷基叠氮化物的 meso-2,3-di 取代的环氧乙烷的不对称开环。对映选择性随环氧乙烷、亲核试剂和金属 (II) d-酒石酸盐的组合而变化很大,并且 Zn(II) d-酒石酸盐在 1,2-环氧环己烷与 1-丁硫醇、苯胺、和三甲基甲硅烷基叠氮化物分别以 85%、58% 和 42% ee 提供相应的加合物。此外,研究了由 Zn(II) d-酒石酸盐催化的具有硫醇的外消旋环氧乙烷的动力学拆分。