Asymmetric Catalytic Hydrogenation of Prochiral Ketones and Aldehydes
申请人:Spindler Felix
公开号:US20090105481A1
公开(公告)日:2009-04-23
Process for stereoselective hydrogenation by reacting racemic aldehydes or ketones having a stereogenic carbon atom in the position relative to the C(O) group and containing the structural element —(O)C—C—CH— by means of hydrogen in the presence of a base and a ruthenium complex containing a bidentate ligand having coordinating P and N atoms, a monophosphine ligand and anionic and/or uncharged ligands as homogeneous catalyst, with the charge being balanced by one or two monovalent acid anions or a divalent acid anion when uncharged ligands are present.
Practical and Efficient Enantioselective Borohydride Reduction of Aromatic Ketones Catalyzed by Optically Active Cobalt(II) Complexes Using Pre-Modified Borohydride
作者:Kiyoaki D. Sugi、Takushi Nagata、Tohru Yamada、Teruaki Mukaiyama
DOI:10.1246/cl.1996.1081
日期:1996.12
A catalytic enantioselective borohydride reduction of aromatic ketones in presence of 0.1-1 mol% of optically active aldiminato cobalt(II) complex catalysts at 0 °C was successfully achieved using precisely pre-modified borohydride with one equivalent each of tetrahydrofurfuryl alcohol, ethanol and NaBH4. The corresponding secondary alcohols were produced in less than 45 min with high enantiomeric
Enantioselective synthesis of cis-α-substituted cycloalkanols and trans-cycloalkyl amines thereof
作者:Rosario Fernández、Abel Ros、Antonio Magriz、Hansjörg Dietrich、José M. Lassaletta
DOI:10.1016/j.tet.2007.04.075
日期:2007.7
diastereo- and enantioselective syntheses of trans-cycloalkyl amines was accomplished through a three-step sequence consisting of: (1) asymmetric transfer hydrogenation through dynamickineticresolution of bicyclic and monocyclic α-substituted ketones using HCO2H/Et3N as the hydrogen source and TsDPEN-based Ru(II) catalysts, (2) nucleophilic hydroxyl to azide substitution of the resulting cis-cycloalkanols
通过三个步骤完成反式环烷基胺的非对映和对映选择性合成:(1)通过动态动力学拆分HCO 2 H / Et 3 N作为双环和单环α-取代的酮进行不对称转移氢化。氢源和基于TsDPEN -钌(II)催化剂,(2)的亲核的羟基向所得的叠氮取代的顺式改性Mitsunobu条件下使用-cycloalkanols二苯基磷叠氮化物,和(3)还原的反式-叠氮化物中间体与的LiAlH 4的PPh 3 / H 2 O达到所需目标。
Copper-catalyzed asymmetric hydrogenation of 2-substituted ketones <i>via</i> dynamic kinetic resolution
作者:Olga V. Zatolochnaya、Sonia Rodríguez、Yongda Zhang、Kendricks S. Lao、Sergei Tcyrulnikov、Guisheng Li、Xiao-Jun Wang、Bo Qu、Soumik Biswas、Hari P. R. Mangunuru、Daniel Rivalti、Joshua D. Sieber、Jean-Nicolas Desrosiers、Joyce C. Leung、Nelu Grinberg、Heewon Lee、Nizar Haddad、Nathan K. Yee、Jinhua J. Song、Marisa C. Kozlowski、Chris H. Senanayake
DOI:10.1039/c8sc00434j
日期:——
A new class of tunable heterophosphole dimeric ligands have been designed and synthesized. These ligands have enabled the first examples of Cu-catalyzed hydrogenation of 2-substituted-1-tetralones and related heteroaryl ketones via dynamic kinetic resolution, simultaneously creating two contiguous stereogenic centers with up to >99 : 1 dr and 98 : 2 er. The ligand-Cu complexes were isolated and characterized
设计并合成了一类新型可调节杂磷二聚体配体。这些配体通过动态动力学拆分实现了铜催化 2-取代-1-四氢萘酮和相关杂芳基酮氢化的第一个例子,同时产生了两个连续的立体中心,其高达 >99 : 1 dr 和 98 : 2 er。通过单晶 X 射线分离并表征了配体-Cu 配合物,DFT 计算揭示了一种新型杂配二聚氢化铜过渡态。