Asymmetric Hydrolytic and Aminolytic Kinetic Resolution of Racemic Epoxides using Recyclable Macrocyclic Chiral Cobalt(III) Salen Complexes
作者:Rajkumar Tak、Manish Kumar、Tusharkumar Menapara、Naveen Gupta、Rukhsana I. Kureshy、Noor-ul H. Khan、E. Suresh
DOI:10.1002/adsc.201700788
日期:2017.11.23
New chiral macrocyclic cobalt(III) salen complexes were synthesized and used as catalyst for the asymmetric kinetic resolution (AKR) of terminalepoxides and glycidyl ethers with aromatic/aliphatic amines and water as nucleophiles. This is the first occasion where a Co(III) salen complex demonstrated its ability to catalyze AKR as well as hydrolytic kinetic resolution (HKR) reactions. Excellent enantiomeric
A new recyclable functionalized mesoporous SBA-15 catalyst grafted with chiral Fe(<scp>iii</scp>) sites for the enantioselective aminolysis of racemic epoxides under solvent free conditions
作者:Mita Halder、Piyali Bhanja、Susmita Roy、Swarbhanu Ghosh、Sudipta Kundu、Md. Mominul Islam、Sk. Manirul Islam
DOI:10.1039/c6ra23289b
日期:——
An efficient and enantioselective strategy for the catalytic ring opening of racemic meso and terminal epoxides with aromatic as well as cyclic amine derivatives has been reported over a new mesoporous SBA-15 catalyst grafted with a chiral Fe(III) complex. The catalyst generates the expected chiral β-amino alcohols in over all better yields along with brilliant enantioselectivity (ee upto >99%) under
A new chiral Fe(<scp>iii</scp>)–salen grafted mesoporous catalyst for enantioselective asymmetric ring opening of racemic epoxides at room temperature under solvent-free conditions
作者:Susmita Roy、Piyali Bhanja、Sk. Safikul Islam、Asim Bhaumik、Sk. Manirul Islam
DOI:10.1039/c5cc08675b
日期:——
A new heterogeneous chiral Fe(iii)–salen grafted mesoporous catalyst has been synthesized for the enantioselective (ee > 99%) ARO reaction of racemic epoxides with aromatic amine under solvent-free conditions.
Chiral Co(<scp>iii</scp>)–salen complex supported over highly ordered functionalized mesoporous silica for enantioselective aminolysis of racemic epoxides
作者:Md. Mominul Islam、Piyali Bhanja、Mita Halder、Sudipta K. Kundu、Asim Bhaumik、Sk. Manirul Islam
DOI:10.1039/c6ra21523h
日期:——
silica material Co(III)@AFS-1. This material has shown excellent catalytic activity for the regio- and enantioselective asymmetric ring opening (ARO) of terminal and meso epoxides using various aromatic as well as cyclic amines to produce chiral β-amino alcohols having very good enantioselectivities (ee > 99%) at ambient temperature under solvent-free neat conditions.
Selective biocatalytic aminolysis of (±)-epichlorohydrin: Synthesis and ICAM-1 inhibitory activity of (S)-(+)-3-arylamino-1-chloropropan-2-ols
作者:Pankaj Gupta、Sumati Bhatia、Ashish Dhawan、Sakshi Balwani、Shatrughan Sharma、Raju Brahma、Rajpal Singh、Balaram Ghosh、Virinder S. Parmar、Ashok K. Prasad
DOI:10.1016/j.bmc.2011.02.029
日期:2011.4
Regio-and enantioselective synthesis of (S)-(+)-3-arylamino-1-chloropropan-2-ols has been achieved by the epoxide ring opening of (+/-)-epichlorohydrin with different aromatic amines in the presence of Candida rugosa lipase. Activities of seven model (S)-(+)-3-arylamino-1-chloropropan-2-ols, out of 10 compounds synthesized, have been evaluated for the inhibition of tumor necrosis factor-alpha TNF-alpha) induced expression of intercellular adhesion molecule-1 (ICAM-1), which is one of the factors responsible for the modulation of inflammation in biological systems; (S)-(+)-1-chloro-3-(2'-chlorophenylamino)-propan-2-ol has been found to exhibit highest activity, that is, 86% inhibition of TNF-alpha induced expression of ICAM-1 at a concentration of 40 mu g/ml. (C) 2011 Elsevier Ltd. All rights reserved.