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Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
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Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
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Sustainable Development

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As the human population continues to grow and use resources, we must be mindful of our planet’s natural limits. Sustainable development provides a pathway to maintain and improve human life now while also ensuring that future generations will have the resources that they need. The long-term success of sustainability efforts rests on understanding the interplay between human actions and ecological systems.
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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
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The hybridized nitrogen atom in amines possesses a lone pair of electrons and is bound to three substituents with a bond angle of around 108°, which is less than the tetrahedral angle of 109.5°. However, the C–N–H bond angle is slightly larger at 112°, with a carbon–nitrogen bond length of 147 pm. This carbon–nitrogen bond length of of amines is longer than the carbon–oxygen bond of alcohols (143 pm) but shorter than alkanes’ carbon–carbon bond (154 pm). These aspects are...
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Amines are organic derivatives of ammonia. They are formed by replacing one or more ammonia protons with alkyl or aryl groups. Depending upon the number of organyl groups bonded to nitrogen, amines are classified as primary, secondary, or tertiary. Primary amines have one organyl group attached to the nitrogen atom, while secondary and tertiary amines have two and three organyl groups attached to the nitrogen atom, respectively.
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Informing Efforts to Develop Nitroreductase for Amine Production.

Anne-Frances Miller1, Jonathan T Park2, Kyle L Ferguson3

  • 1Department of Chemistry, University of Kentucky, Lexington, KY 40506-0055, USA. afmill3r2@gmail.com.

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Summary

Nitroreductases (NRs) efficiently convert nitroaromatics into aromatic amines. Enzyme structure and substrate properties significantly influence reaction rates and amine yields, highlighting potential for biocatalysis.

Keywords:
domain-swapped dimerenzyme-aided synthesisflavinflavoenzymeintertwined dimernitroreductasestructure-activitystructure-function

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Area of Science:

  • Biochemistry
  • Enzymology
  • Biocatalysis

Background:

  • Nitroreductases (NRs) are enzymes capable of reducing nitroaromatics to aromatic amines.
  • Substrate identity and enzyme structure are key factors influencing NR activity and product yield.
  • Current limitations include low amine yields and a need to explore enzyme diversity for optimized biocatalysis.

Purpose of the Study:

  • To investigate the relationship between nitroaromatic structure and nitroreductase activity.
  • To explore the potential of different nitroreductase subgroups for aromatic amine production.
  • To understand the structural basis for nitroreductase functional diversity and its implications for biocatalysis.

Main Methods:

  • Assessed nitroaromatic reduction rates across different nitroreductase subgroups.
  • Correlated reaction rates with Hammett substituent constants to determine substrate influence.
  • Compared substrate binding cavities and active site configurations of various nitroreductases.
  • Analyzed the structural architecture of nitroreductase dimers and their active sites.

Main Results:

  • Nitroaromatic reduction rate positively correlates with the Hammett substituent constant, indicating substrate identity is crucial.
  • Compounds with large π systems and electron-withdrawing substituents yielded higher amine concentrations.
  • Distinct substrate binding cavities and active site constraints were observed across four different nitroreductase subgroups.
  • The dimeric structure of nitroreductases provides significant stabilization for active sites.

Conclusions:

  • Nitroreductase functional diversity arises from the flavin cofactor's versatility and adaptable active site structures.
  • Nitroreductases are promising biocatalysts for prodrug activation and synthesizing valuable aromatic amines.
  • A framework is provided for identifying optimal nitroreductase-substrate pairs for enhanced biocatalytic applications.