Biocatalytic Michael-Type Additions of Acetaldehyde to Nitroolefins with the Proline-Based Enzyme 4-Oxalocrotonate Tautomerase Yielding Enantioenriched γ-Nitroaldehydes
作者:Edzard M. Geertsema、Yufeng Miao、Pieter G. Tepper、Pim de Haan、Ellen Zandvoort、Gerrit J. Poelarends
DOI:10.1002/chem.201302351
日期:2013.10.18
Call me Michaelase: The enzyme 4‐oxalocrotonate tautomerase (4‐OT) promiscuously catalyzes the Michael‐type addition of acetaldehyde to a collection of aromatic and aliphatic nitroolefins with high stereoselectivity producing precursors of γ‐aminobutyric acid (GABA) analogues (see scheme).
Biocatalytic Asymmetric Michael Additions of Nitromethane to α,β-Unsaturated Aldehydes via Enzyme-bound Iminium Ion Intermediates
作者:Chao Guo、Mohammad Saifuddin、Thangavelu Saravanan、Masih Sharifi、Gerrit J. Poelarends
DOI:10.1021/acscatal.9b00780
日期:2019.5.3
found to efficiently promote asymmetric Michael additions of nitromethane to various α,β-unsaturatedaldehydes to give γ-nitroaldehydes, important precursors to biologically active γ-aminobutyric acids. High conversions, high enantiocontrol, and good isolated product yields were achieved. The reactions likely proceed via iminium ion intermediates formed between the catalytic Pro-1 residue and the α,β-unsaturated
Diphenylprolinol Silyl Ether as Catalyst of an Asymmetric, Catalytic, and Direct Michael Reaction of Nitroalkanes with α,β-Unsaturated Aldehydes
作者:Hiroaki Gotoh、Hayato Ishikawa、Yujiro Hayashi
DOI:10.1021/ol702545z
日期:2007.12.1
A catalyticenantioselective direct conjugate addition of nitroalkanes to alpha,beta-unsaturated aldehydes using diphenylprolinolsilylether as an organocatalyst has been developed. Using this methodology as a key step, short syntheses of therapeutically useful compounds have also been accomplished.
[EN] PROCESS FOR THE PREPARATION OF GAMMA AMINO ACIDS AND INTERMEDIATES USED IN SAID PROCESS<br/>[FR] PROCÉDÉ DE PRÉPARATION DE ACIDES AMINÉS GAMMA ET INTERMÉDIAIRES UTILISÉS DANS CE PROCÉDÉ
申请人:ROYAL COLLEGE OF SURGEONS IE
公开号:WO2013076225A1
公开(公告)日:2013-05-30
The invention relates to the preparation of gamma amino acids of formula (I) and pharmaceutically acceptable salts, solvates and prodrugs thereof, and to intermediates used for their preparation. (formula I) wherein R1 is selected from an alkyl group, an alkenyl group, an alkynyl group and a cycloalkyl group, each of which may be optionally substituted and * denotes a chiral centre. In particular, the present invention provides an efficient synthesis of (S)-pregabalin which is suitable for carrying out on an industrial scale.
Polyethylene glycol (PEG) as a reusable solvent medium for an asymmetric organocatalytic Michael addition. Application to the synthesis of bioactive compounds
作者:Karla S. Feu、Alexander F. de la Torre、Sandrina Silva、Marco A. F. de Moraes Junior、Arlene G. Corrêa、Márcio W. Paixão
DOI:10.1039/c4gc00098f
日期:——
A highly stereoselective organocatalytic Michael addition of aldehydes to trans-β-nitrostyrenes using PEG as a recyclable solvent medium is presented.