1228556-60-2Relevant academic research and scientific papers
Synthetic modifications of bifunctional homoallylamines: Synthesis of 2-arylpiperidines, (R)-anatabine and (R)-anabasine
Nallasivam, Jothi L.,Fernandes, Rodney A.
, p. 2815 - 2822 (2019)
The chiral homoallylamines with orthogonal bifunctional handle, an amine, and a pendant allyl unit are available to be easily converted into N-heterocycles. The N-allylation and Ru-catalyzed ring-closing metathesis delivered the bioactive 2-arylpiperidines, Nicotiana tabacum alkaloids (R)-anatabine and (R)-anabasine in three steps. A formal synthesis of (R)-N-methylanatabine and (R)-N-methylanabasine is also completed.
Structure, activity and stereoselectivity of NADPH-dependent oxidoreductases catalysing the S-selective reduction of the imine substrate 2-methylpyrroline
Man, Henry,Wells, Elizabeth,Hussain, Shahed,Leipold, Friedemann,Hart, Sam,Turkenburg, Johan P.,Turner, Nicholas J.,Grogan, Gideon
, p. 1052 - 1059 (2015)
Oxidoreductases from Streptomyces sp. GF3546 [3546-IRED], Bacillus cereus BAG3X2 (BcIRED) and Nocardiopsis halophila (NhIRED) each reduce prochiral 2-methylpyrroline (2MPN) to (S)-2-methylpyrrolidine with >95 % ee and also a number of other imine substrates with good selectivity. Structures of BcIRED and NhIRED have helped to identify conserved active site residues within this subgroup of imine reductases that have S selectivity towards 2MPN, including a tyrosine residue that has a possible role in catalysis and superimposes with an aspartate in related enzymes that display R selectivity towards the same substrate. Mutation of this tyrosine residue - Tyr169 - in 3546-IRED to Phe resulted in a mutant of negligible activity. The data together provide structural evidence for the location and significance of the Tyr residue in this group of imine reductases, and permit a comparison of the active sites of enzymes that reduce 2MPN with either R or S selectivity.
Combined Imine Reductase and Amine Oxidase Catalyzed Deracemization of Nitrogen Heterocycles
Heath, Rachel S.,Pontini, Marta,Hussain, Shahed,Turner, Nicholas J.
, p. 117 - 120 (2016/01/26)
A novel amine oxidase (AO)/imine reductase (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) or 6-HDNO in combination with ammonia borane, which allowed comparison of the two enzyme deracemization approaches with that involving a chemical reducing agent.
Enantioselective synthesis of substituted piperidines by addition of aryl grignard reagents to pyridine N-oxides
Hussain, Munawar,Banchelin, Thomas Sainte-Luce,Andersson, Hans,Olsson, Roger,Almqvist, Fredrik
, p. 54 - 57 (2013/03/28)
The synthesis of optically active piperidines by enantioselective addition of aryl Grignard reagents to pyridine N-oxides and lithium binolate followed by reduction is reported for the first time. The reaction results in high yields (51-94%) in combinatio
Enantioselective allylation of imines catalyzed by newly developed (-)-β-pinene-based π-allylpalladium catalyst: An efficient synthesis of (R)-α-propylpiperonylamine and (R)-pipecolic acid
Fernandes, Rodney A.,Nallasivam, Jothi L.
, p. 7789 - 7800 (2013/04/23)
A newly developed π-allylpalladium with a (-)-β-pinene framework and an isobutyl side chain catalyzed the enantioselective allylation of imines in good yields and enantioselectivities (20 examples, up to 98% ee). An efficient enantioselective synthesis of the (R)-α-propyl piperonylamine part of DMP 777, a human leukocyte elastase inhibitor and (R)-pipecolic acid have been achieved as a useful application of this methodology. The Royal Society of Chemistry 2012.
Applications of N′-alkylated derivatives of TsDPEN in the asymmetric transfer hydrogenation of C=O and C=N bonds
Martins, Jose E.D.,Contreras Redondo, Miguel A.,Wills, Martin
experimental part, p. 2258 - 2264 (2010/11/03)
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.
