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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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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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Dehydration Synthesis01:15

Dehydration Synthesis

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Dehydration synthesis (also called a condensation reaction) is the chemical process in which two molecules covalently link together to form a new molecule, along with the release of a water molecule. Many physiologically important compounds form by dehydration synthesis reactions, such as complex carbohydrates, proteins, DNA, and RNA.
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Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
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During replication, the complementary strands in double-stranded DNA are synthesized at different rates. Replication first begins on the leading strand. Replication starts later, occurs more slowly, and proceeds discontinuously on the lagging strand.
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Related Experiment Video

Updated: Feb 4, 2026

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
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Progress in using threonine aldolases for preparative synthesis.

Sarah F Beaudoin1, Michael P Hanna1, Ion Ghiviriga1

  • 1Department of Chemistry, 126 Sisler Hall, University of Florida, Gainesville, FL 32611 USA.

Enzyme and Microbial Technology
|September 24, 2018
PubMed
Summary
This summary is machine-generated.

Three threonine aldolases (TAs) were cloned and optimized for biocatalysis. The Aeromonas jandaei TA showed superior performance, enabling simplified product isolation through enzymatic treatment and scale-up for potential applications.

Keywords:
Aldol reactionDesign of experimentsGlycine oxidaseSubstrate screeningThreonine aldolase

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Preparation of DMMTAV and DMDTAV Using DMAV for Environmental Applications: Synthesis, Purification, and Confirmation
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Area of Science:

  • Biocatalysis and Enzyme Engineering
  • Organic Synthesis
  • Biotechnology

Background:

  • Threonine aldolases (TAs) are enzymes capable of catalyzing aldol reactions.
  • Exploring diverse TAs is crucial for expanding biocatalytic toolkits.
  • Overexpression and characterization of novel TAs can lead to improved synthetic methods.

Purpose of the Study:

  • To clone and overexpress three distinct threonine aldolases from different microbial sources.
  • To optimize reaction conditions for each TA using a Design of Experiments approach.
  • To evaluate the substrate and stereoselectivity of the TAs for potential synthetic applications.

Main Methods:

  • Gene cloning and protein overexpression in Escherichia coli.
  • Design of Experiments (DoE) for reaction condition optimization.
  • Substrate scope and stereoselectivity assays.
  • Scale-up of promising reactions and downstream processing.
  • Nuclear Magnetic Resonance (NMR) for product identification and stereochemical analysis.

Main Results:

  • Successful cloning and overexpression of Aeromonas jandaei TA, E. coli TA, and Thermotoga maritima TA.
  • Optimized reaction conditions were established for each enzyme.
  • A. jandaei TA demonstrated superior performance and broader substrate acceptance.
  • Enzymatic treatment with Bacillus subtilis glycine oxidase simplified product purification.
  • NMR analysis confirmed diastereomer formation and absolute configurations.

Conclusions:

  • The characterized threonine aldolases, particularly A. jandaei TA, offer valuable biocatalytic routes for aldol additions.
  • Optimized conditions and downstream processing enhance the practicality of TA-catalyzed reactions.
  • This study provides a foundation for utilizing these TAs in stereoselective synthesis.