One-Pot Cascade Synthesis of Mono- and Disubstituted Piperidines and Pyrrolidines using Carboxylic Acid Reductase (CAR), ω-Transaminase (ω-TA), and Imine Reductase (IRED) Biocatalysts
作者:Scott P. France、Shahed Hussain、Andrew M. Hill、Lorna J. Hepworth、Roger M. Howard、Keith R. Mulholland、Sabine L. Flitsch、Nicholas J. Turner
DOI:10.1021/acscatal.6b00855
日期:2016.6.3
Access to enantiomerically pure chiral mono- and disubstituted piperidines and pyrrolidines has been achieved using a biocatalytic cascade involving carboxylic acid reductase (CAR), ω-transaminase (ω-TA), and imine reductase (IRED) enzymes. Starting from keto acids or keto aldehydes, substituted piperidine or pyrrolidine frameworks can be generated in high conversion, ee, and de in one pot, with each
Applications of N′-alkylated derivatives of TsDPEN in the asymmetric transfer hydrogenation of CO and CN bonds
作者:José E.D. Martins、Miguel A. Contreras Redondo、Martin Wills
DOI:10.1016/j.tetasy.2010.07.013
日期:2010.9
Arene/Ru(II) complexes of (R,R)-N-alkyl-TsDPEN ligands are effective in the asymmetric transfer hydrogenation of ketones and imines in formic acid/triethylamine solution. The complex derived from the N'-Bn derivative of TsDPEN reduces monocyclic imines in up to 60% ee, whilst the N'-Me derivative of TsDPEN forms a more active catalyst than the non-alkylated analogue and reduces ketones in up to 97% ee. (C) 2010 Elsevier Ltd. All rights reserved.