Amination is the process by which an amine group is introduced into an organic molecule. This type of reaction is important because organonitrogen compounds are pervasive.

Reactions edit

Aminase enzymes edit

Enzymes that catalyse this reaction are termed aminases. Amination can occur in a number of ways including reaction with ammonia or another amine such as an alkylation, reductive amination and the Mannich reaction.

Acid-catalysed hydroamination edit

Many alkyl amines are produced industrially by the amination of alcohols using ammonia in the presence of solid acid catalysts. Illustrative is the production of tert-butylamine:

NH3 + CH2=C(CH3)2 → H2NC(CH3)3

The Ritter reaction of isobutene with hydrogen cyanide is not useful in this case because it produces too much waste.[1]

Electrophilic amination edit

Usually, the amine reacts as the nucleophile with another organic compound acting as the electrophile. This sense of reactivity may be reversed for some electron-deficient amines, including oxaziridines, hydroxylamines, oximes, and other N–O substrates. When the amine is used as an electrophile, the reaction is called electrophilic amination. Electron-rich organic substrates that may be used as nucleophiles for this process include carbanions and enolates.

Miscellaneous methods edit

Alpha hydroxy acids can be converted into amino acids directly using aqueous ammonia solution, hydrogen gas and a heterogeneous metallic ruthenium catalyst.[2]

Metal-catalyzed hydroamination edit

In hydroamination, amines add to alkenes.[3]

See also edit

References edit

  1. ^ Eller, Karsten; Henkes, Erhard; Rossbacher, Roland; Höke, Hartmut (2000). "Amines, Aliphatic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/14356007.a02_001. ISBN 978-3527306732.
  2. ^ Deng, Weiping, et al. "Catalytic amino acid production from biomass-derived intermediates." Proceedings of the National Academy of Sciences 115.20 (2018): 5093-5098. doi:10.1073/pnas.1800272115
  3. ^ Liangbin Huang, Matthias Arndt, Käthe Gooßen, Heinrich Heydt, and Lukas J. Gooßen "Late Transition Metal-Catalyzed Hydroamination and Hydroamidation" Chem. Rev., 2015, 115 (7), pp 2596–2697. doi:10.1021/cr300389u