One-pot Sequence for the Decarboxylation of α-Amino Acids
作者:Bernard T. Golding、Gilles Laval
DOI:10.1055/s-2003-37512
日期:——
Treatment of an α-amino acid with N-bromosuccinimide in water at pH 5 or in an alcoholic-aqueous ammonium chloride mixture, followed by addition of nickel(II) chloride and sodium borohydride, effected an overall decarboxylation via an intermediate nitrile to afford the corresponding amine in good yield.
Decarboxylation of a Wide Range of Amino Acids with Electrogenerated Hypobromite
作者:Roman Matthessen、Laurens Claes、Jan Fransaer、Koen Binnemans、Dirk E. De Vos
DOI:10.1002/ejoc.201403112
日期:2014.10
Bromide-assisted electrochemical decarboxylation efficiently produces valuable nitriles in high yields from a wide range of naturally occurring aminoacids in a single step. Bromide salts are used as both redox mediators and supporting electrolytes in a simple one-compartment setup. As demonstrated for lysine, the selectivity of the decarboxylation can be tuned towards nitriles, amines or amides.
Bio-Based Nitriles from the Heterogeneously Catalyzed Oxidative Decarboxylation of Amino Acids
作者:Laurens Claes、Roman Matthessen、Ine Rombouts、Ivo Stassen、Trees De Baerdemaeker、Diederik Depla、Jan A. Delcour、Bert Lagrain、Dirk E. De Vos
DOI:10.1002/cssc.201402801
日期:2015.1
The oxidativedecarboxylation of aminoacids to nitriles was achieved in aqueous solution by in situ halide oxidation using catalytic amounts of tungstate exchanged on a [Ni,Al] layered double hydroxide (LDH), NH4Br, and H2O2 as the terminal oxidant. Both halide oxidation and oxidativedecarboxylation were facilitated by proximity effects between the reactants and the LDH catalyst. A wide range of
在水溶液中,通过催化卤化原位卤化物,使用在[Ni,Al]层状双氢氧化物(LDH),NH 4 Br和H 2 O 2上交换的钨酸盐,将氨基酸氧化成腈作为末端氧化剂。反应物和LDH催化剂之间的邻近效应促进了卤化物的氧化和氧化的脱羧。各种氨基酸的转化率很高,通常> 90%。腈的选择性非常好,经过适当的中和后,该体系可与酰胺,醇,特别是羧酸,胺和胍官能团相容。这种非均相催化系统已成功应用于将淀粉工业中富含蛋白质的副产物转化为有用的生物基含氮化学品。
Kinetics of Oxidation of Amino Acids by Chloramine-T. A Reinvestigation on the Oxidation of Alanine, 2-Aminobutyric Acid, Valine, Serine, and Threonine
The kinetics of oxidation of aminoacids in aqueous medium were reinvestigated. The rate of oxidation follows second order with respect to chloramine-T (CAT) and an inverse dependence on [p-toluene-sulfonamide] (RNH2). At constant [RNH2] the rate of the reaction can be represented as (in the absence of chloride ion)\frac−d[CAT]dt=ka[CAT]2+kb\frac[AminoAcid][CAT]2[H+]+kc\frac[AminoAcid]2[CAT]2[H+]2
A Boron–Oxygen Transborylation Strategy for a Catalytic Midland Reduction
作者:Kieran Nicholson、Joanne Dunne、Peter DaBell、Alexander Beaton Garcia、Andrew D. Bage、Jamie H. Docherty、Thomas A. Hunt、Thomas Langer、Stephen P. Thomas
DOI:10.1021/acscatal.0c05168
日期:2021.2.19
The enantioselective hydroboration of ketones is a textbook reaction requiring stoichiometric amounts of an enantioenriched borane, with the Midland reduction being a seminal example. Here, a turnover strategy for asymmetric catalysis, boron–oxygen transborylation, has been developed and used to transform the stoichiometric boranereagents of the Midland reduction into catalysts. This turnover strategy