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Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

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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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Amines to Amides: Acylation of Amines01:19

Amines to Amides: Acylation of Amines

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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.
Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary...
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Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

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Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
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Preparation of Amines: Alkylation of Ammonia and Amines01:30

Preparation of Amines: Alkylation of Ammonia and Amines

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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.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
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Preparation of 1° Amines: Azide Synthesis01:22

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Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

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Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
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Synthesis of Protein Bioconjugates via Cysteine-maleimide Chemistry
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Ex Situ Gaseous Reagent for Multicomponent Amine Bioconjugation.

Yuxuan Ding1, Simon S Pedersen1,2, Yixian Wang1

  • 1Department of Chemistry, Rice University, Houston, Texas 77005, United States.

Organic Letters
|July 29, 2024
PubMed
Summary
This summary is machine-generated.

A new gaseous reagent enables efficient multicomponent bioconjugation. This method links diverse molecules like saccharides and affinity tags to proteins via amines, creating urea or carbamate linkages for various applications.

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Area of Science:

  • Chemical Biology
  • Organic Synthesis
  • Bioconjugation Chemistry

Background:

  • Bioconjugation is crucial for modifying proteins and polypeptides.
  • Existing methods often require complex reagents or conditions.
  • Developing efficient and versatile bioconjugation strategies remains an active research area.

Purpose of the Study:

  • To develop a novel, minimalist gaseous reagent for multicomponent bioconjugation.
  • To enable the efficient cross-linking of biologically relevant molecules to proteins.
  • To create urea or carbamate linkages using a gas-phase reaction.

Main Methods:

  • Utilized a gaseous sulfonyl-chloride-derived reagent.
  • Employed metal ion mediation for the reaction.
  • Performed multicomponent reactions with amine, phenol, or aniline reagents.
  • Applied the method to conjugate saccharides, poly(ethylene glycol), fluorophores, and affinity tags.

Main Results:

  • Achieved efficient cross-linking of various molecules to polypeptides and proteins.
  • Successfully conjugated molecules to the N terminus and lysine side-chain amines.
  • Demonstrated the formation of urea and carbamate products.
  • Showcased the versatility of the gaseous reagent for bioconjugation.

Conclusions:

  • The minimalist gaseous reagent offers a powerful tool for bioconjugation.
  • This method facilitates the attachment of diverse functional groups to proteins.
  • The gas-phase approach provides an efficient and adaptable strategy for protein modification.