Structure, Activity and Stereoselectivity of NADPH-Dependent Oxidoreductases Catalysing the<i>S</i>-Selective Reduction of the Imine Substrate 2-Methylpyrroline
作者:Henry Man、Elizabeth Wells、Shahed Hussain、Friedemann Leipold、Sam Hart、Johan P. Turkenburg、Nicholas J. Turner、Gideon Grogan
DOI:10.1002/cbic.201402625
日期:2015.5.4
production of chiral amines: The structures of imine reductases (IREDs) from B. cereus and N. halophila that are S‐selective for the reduction of 2‐methylpyrroline (2MPN) reveal conservation of residues in this IRED subgroup. These structures permit comparison with those of IREDs that are R‐selective for 2MPN reduction, revealing structural differences in the active sites.
Characterization of three novel enzymes with imine reductase activity
作者:M. Gand、H. Müller、R. Wardenga、M. Höhne
DOI:10.1016/j.molcatb.2014.09.017
日期:2014.12
Iminereductases (IRED) are promising catalysts for the synthesis of optically pure secondary cyclic amines. Three novel IREDs from Paenibacillus elgii B69, Streptomyces ipomoeae 91-03 and Pseudomonas putida KT2440 were identified by amino acid or structural similarity search, cloned and recombinantly expressed in E. coli and their substrate scope was investigated. Besides the acceptance of cyclic
Preparation of 2,3,4,5-Tetrahydropyridines from 5-Alkynylamines Under the Catalytic Action of Gold(III) Salts
作者:Yukitoshi Fukuda、Kiitiro Utimoto
DOI:10.1055/s-1991-26621
日期:——
Intramolecular addition of amine to carbon-carbon triple bonds in 5-alkynylamines produces 2,3,4,5-tetrahydropyridines under the catalytic action of an aurate salt. Some venom components of various ant species are synthesized by the application of this reaction.
Use of Group 4 Bis(sulfonamido) Complexes in the Intramolecular Hydroamination of Alkynes and Allenes
作者:Lutz Ackermann、Robert G. Bergman、Rebecca N. Loy
DOI:10.1021/ja0361547
日期:2003.10.1
the intramolecularhydroamination of alkynes and allenes more efficiently than Cp-based species. We report here that electron-withdrawing and sterically demanding bis(sulfonamido) ligands lead to enhanced catalytic activity. Zirconium analogues have also been prepared, and the tosyl-substituted complex 20 has been structurally characterized. As in the titanium series, bis(sulfonamido) zirconium catalysts
作者:Norbert De Kimpe、Marian Keppens、Gwendolien Fonck
DOI:10.1039/cc9960000635
日期:——
Cyclic six-membered imines, i.e. 2,3,4,5-tetrahydropyridines, are efficiently converted under mild conditions into the corresponding pyridines by highly regioselective α, α-dichlorination with N-chlorosuccinimide (NCS) followed by double dehydrochlorination with methanolic bases.