Synthesis of Chiral Aromatic Alcohols: Use of New C<sub>2</sub>-Symmetric Rh<sup>III</sup>Cp∗, Ru<sup>II</sup>(cymene), or Ru<sup>II</sup>(benzene) Complexes Containing Chiral Diaminocyclohexane Ligand as Asymmetric Transfer Hydrogenation Catalyst
Abstract Twelve chiral secondary alcohols were synthesized by asymmetrictransferhydrogenation (ATH) using C2-symmetric bis(sulfonamide) ligand (2) derived from (1R,2R)-cyclohexane-1,2-diamine and complexed with [RhCl2Cp*]2, [RuCl2(cymene)]2, or [RuCl2(benzene)]2 and then used in situ in the reduction of prochiral ketones. The alcohols were obtained in 85–99% yield and 90–99% enantioselectivity with
Lipase mediated enzymatic kinetic resolution of phenylethyl halohydrins acetates: A case of study and rationalization
作者:Thiago de Sousa Fonseca、Kimberly Benedetti Vega、Marcos Reinaldo da Silva、Maria da Conceição Ferreira de Oliveira、Telma Leda Gomes de Lemos、Martina Letizia Contente、Francesco Molinari、Marco Cespugli、Sara Fortuna、Lucia Gardossi、Marcos Carlos de Mattos
DOI:10.1016/j.mcat.2020.110819
日期:2020.4
light on the different reaction rates, dockingstudies were carried out with all the substrates using MD simulations. The computational data obtained for the β-brominated substrates, based on the parameters analysed such as NAC (near attack conformation), distance between Ser-O and carbonyl-C and oxyanion site stabilization were in agreement with the experimental results. On the other hand, the data
Immobilization of Amano lipase from Pseudomonas fluorescens on silk fibroin spheres: an alternative protocol for the enantioselective synthesis of halohydrins
作者:Irlon M. Ferreira、Sergio A. Yoshioka、João V. Comasseto、André L. M. Porto
DOI:10.1039/c7ra00083a
日期:——
for a new, efficient, cheaper and sustainable matrix for lipaseimmobilization is a growing area in biotechnology. Amano lipasefromPseudomonas fluorescens was immobilized on silk fibroin spheres and used in the enzymatic kinetic resolution of halohydrins, to obtain optically active epoxides (up to 99% ee), important precursors in the synthesis of derivative antifungal azoles. This paper reinforces
DMSO-triggered enhancement of enantioselectivity in Novozyme[435]-catalyzed transesterification of chiral 1-phenylethanols
作者:Amrit Goswami、Jonali Goswami
DOI:10.1016/j.tetlet.2005.03.147
日期:2005.6
Dimethyl sulfoxide as cosolvent enhances the enantioselectivity of resolved products up to 100% in the Novozyme[435]-catalyzed transesterification of chiral 1-phenylethanols but not 1-phenyl-2-haloethanols in THF. The reaction does not proceed in lipophilic and water-miscible polar solvents.
Aminocyclopentadienyl Ruthenium Complexes as Racemization Catalysts for Dynamic Kinetic Resolution of Secondary Alcohols at Ambient Temperature
作者:Jun Ho Choi、Yoon Kyung Choi、Yu Hwan Kim、Eun Sil Park、Eun Jung Kim、Mahn-Joo Kim、Jaiwook Park
DOI:10.1021/jo0355799
日期:2004.3.1
tests in the racemization of (S)-4-phenyl-2-butanol showed that 7 is the most active catalyst, although the difference decreased in the DKR. Complex 4 was used in the DKR of various alcohols; at room temperature, not only simple alcohols but also functionalized ones such as allylic alcohols, alkynyl alcohols, diols, hydroxyl esters, and chlorohydrins were successfully transformed to chiral acetates. In