Enantioselective synthesis of (S,S)-ethambutol using proline-catalyzed asymmetric α-aminooxylation and α-amination
摘要:
An efficient enantioselective synthesis of (S,S)-ethambutol, a tuberculostatic antibiotic, has been achieved in 99% ee via both proline-catalyzed alpha-aminooxylation and alpha-amination of n-butyraldehyde as the key step. (c) 2006 Elsevier Ltd. All rights reserved.
An octahedral bis-cyclometalated iridium(III) complex catalyzes the enantioselective α-amination of aldehydes with catalyst loadings down to 0.1 mol%. In this metal-templated design, the metal serves as a structural center and provides the exclusive source of chirality, whereas the catalysis is mediated through the organic ligand sphere.
Asymmetric α-Amination of Aldehydes Catalyzed by PS-Diphenylprolinol Silyl Ethers: Remediation of Catalyst Deactivation for Continuous Flow Operation
作者:Xinyuan Fan、Sonia Sayalero、Miquel A. Pericàs
DOI:10.1002/adsc.201200887
日期:2012.11.12
diphenylprolinol silylethers have been developed as highly active catalysts for the enantioselective α-amination of aldehydes. Understanding the mechanism of catalystdeactivation has led to the development of reaction conditions notably extending catalyst life in repeated recycling (10 cycles; accumulated TON of 480) and has allowed the implementation of a continuousflowα-amination process (6 min
Asymmetric Catalysis with a Mechanically Point-Chiral Rotaxane
作者:Yusuf Cakmak、Sundus Erbas-Cakmak、David A. Leigh
DOI:10.1021/jacs.6b00303
日期:2016.2.17
Mechanical point-chirality in a [2]rotaxane is utilized for asymmetriccatalysis. Stable enantiomers of the rotaxane result from a bulky group in the middle of the thread preventing a benzylic amide macrocycle shuttling between different sides of a prochiral center, creating point chirality in the vicinity of a secondary amine group. The resulting mechanochirogenesis delivers enantioselective organocatalysis
Polymer-immobilized α,α-bis[bis-3,5-(trifluoromethyl)phenyl]prolinol silyl ether: synthesis and application in the asymmetric α-amination of aldehydes
作者:Anton A. Guryev、Maksim V. Anokhin、Alexei D. Averin、Irina P. Beletskaya
DOI:10.1016/j.mencom.2015.11.002
日期:2015.11
alpha,alpha-Bis[bis-3,5-(trifluoromethyl)phenyl]prolinol silyl ether anchored onto polystyrene was synthesized and tested in asymmetric alpha-amination of aldehydes. The catalytic activity and enantioselectivity of the immobilized catalyst persist for 3 cycles.
Enantioselective synthesis of (S,S)-ethambutol using proline-catalyzed asymmetric α-aminooxylation and α-amination
作者:Shriram P. Kotkar、Arumugam Sudalai
DOI:10.1016/j.tetasy.2006.06.011
日期:2006.7
An efficient enantioselective synthesis of (S,S)-ethambutol, a tuberculostatic antibiotic, has been achieved in 99% ee via both proline-catalyzed alpha-aminooxylation and alpha-amination of n-butyraldehyde as the key step. (c) 2006 Elsevier Ltd. All rights reserved.