Enantioselective Biocatalytic Oxidative Desymmetrization of Substituted Pyrrolidines
作者:Valentin Köhler、Kevin R. Bailey、Anass Znabet、James Raftery、Madeleine Helliwell、Nicholas J. Turner
DOI:10.1002/anie.200906655
日期:2010.3.15
Made up out of air: The highly enantioselectiveoxidation of 3,4‐substituted meso‐pyrrolidines to Δ1‐pyrrolines is reported. The reaction is catalyzed by monoamine oxidase from Aspergillus niger (MAO‐N D5) and utilizes molecular oxygen from air as the stoichiometric oxidant. The corresponding Δ1‐pyrrolines serve as useful building blocks for the synthesis of L‐proline analogues and α‐amino nitriles
Stereoselective synthesis of N-aryl proline amides by biotransformation–Ugi-Smiles sequence
作者:Anass Znabet、Sara Blanken、Elwin Janssen、Frans J. J. de Kanter、Madeleine Helliwell、Nicholas J. Turner、Eelco Ruijter、Romano V. A. Orru
DOI:10.1039/c1ob06699d
日期:——
An efficient combination of MAO-N-catalyzed desymmetrization of cyclic meso-amines with Ugi-Smiles multicomponent chemistry produced optically pure N-aryl proline amides. This method represents the first report of a fully asymmetric Ugi-Smiles process.
Stereoselective Monoamine Oxidase-Catalyzed Oxidative Aza-Friedel-Crafts Reactions of<i>meso</i>-Pyrrolidines in Aqueous Buffer
作者:Corien de Graaff、Barry Oppelaar、Olivier Péruch、Christophe M. L. Vande Velde、Beatrice Bechi、Nicholas J. Turner、Eelco Ruijter、Romano V. A. Orru
DOI:10.1002/adsc.201600038
日期:2016.5.19
We disclose the highly diastereoselective combination of monoamine oxidase‐catalyzed oxidation of meso‐pyrrolidines and aza‐Friedel–Crafts reactions in aqueous buffer to give valuable enantioenriched 2‐substituted pyrrolidines in a formal double CH activation process. A range of secondary as well as tertiary amines were shown to be suitable substrates for the biocatalytic oxidation and subsequent