A stereoselective approach to 6-alkylated piperidinone & 2-piperidine via three-component vinylogous Mannich reactions (VMR) and a concise synthesis of (S)-anabasine
摘要:
A three-component diastereoselective vinylogous Mannich-type reaction (VMR) with the silyl ketene acetal (1) was developed. Adducts from the reactions provided valuable intermediates for construction of a variety of chiral 6-alkylated piperidinone and 2-piperidine compounds. The strategy was applied in a concise synthesis (S)-anabasine. (C) 2011 Elsevier Ltd. All rights reserved.
An (<i>R</i>)-Imine Reductase Biocatalyst for the Asymmetric Reduction of Cyclic Imines
作者:Shahed Hussain、Friedemann Leipold、Henry Man、Elizabeth Wells、Scott P. France、Keith R. Mulholland、Gideon Grogan、Nicholas J. Turner
DOI:10.1002/cctc.201402797
日期:2015.2
enantiomerically pure chiral amines continues to expand, few existing methods provide access to secondary amines. To address this shortcoming, we have over-expressed the gene for an (R)-imine reductase [(R)-IRED] from Streptomyces sp. GF3587 in Escherichia coli to create a recombinant whole-cell biocatalyst for the asymmetricreduction of prochiral imines. The (R)-IRED was screened against a panel of cyclic imines
Combined Imine Reductase and Amine Oxidase Catalyzed Deracemization of Nitrogen Heterocycles
作者:Rachel S. Heath、Marta Pontini、Shahed Hussain、Nicholas J. Turner
DOI:10.1002/cctc.201500822
日期:2016.1
novel amineoxidase (AO)/iminereductase (IRED) system was developed for the deracemization of racemic amines. By combining (R)‐6‐hydroxy‐d‐nicotine oxidase (6‐HDNO) with an (R)‐IRED, a panel of racemic 2‐substituted piperidines and pyrrolidines were deracemized to yield the (S)‐amines in high yields and enantiomeric excess values. Other N‐heterocycles were deracemized with monoamine oxidase (MAO‐N)
A stereoselective approach to 6-alkylated piperidinone & 2-piperidine via three-component vinylogous Mannich reactions (VMR) and a concise synthesis of (S)-anabasine
作者:Yang Yang、Dean P. Phillips、Shifeng Pan
DOI:10.1016/j.tetlet.2011.01.090
日期:2011.4
A three-component diastereoselective vinylogous Mannich-type reaction (VMR) with the silyl ketene acetal (1) was developed. Adducts from the reactions provided valuable intermediates for construction of a variety of chiral 6-alkylated piperidinone and 2-piperidine compounds. The strategy was applied in a concise synthesis (S)-anabasine. (C) 2011 Elsevier Ltd. All rights reserved.