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Related Concept Videos

Preparation of Amides01:29

Preparation of Amides

Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC).
The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent.
Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

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...
Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

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...
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...

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Constructing Thioether/Vinyl Sulfide-tethered Helical Peptides Via Photo-induced Thiol-ene/yne Hydrothiolation
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Efficient syntheses of thiadiazole peptides.

Alan R Katritzky1, Claudia El-Nachef, Kiran Bajaj

  • 1Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA. katritzky@chem.ufl.edu

The Journal of Organic Chemistry
|August 11, 2010
PubMed
Summary

Researchers synthesized novel 1,3,4-thiadiazoles from thiosemicarbazides. These compounds were then used to create chirally pure amino acids and dipeptides, advancing peptide chemistry.

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Peptide Synthesis

Background:

  • Thiosemicarbazides are versatile precursors in heterocyclic chemistry.
  • 1,3,4-thiadiazoles exhibit a range of biological activities.
  • Chirally pure amino acids and peptides are crucial building blocks in drug discovery.

Purpose of the Study:

  • To synthesize novel N-(Cbz-aminoacyl)thiosemicarbazides.
  • To cyclize these precursors into 1,3,4-thiadiazole derivatives.
  • To utilize the synthesized thiadiazoles for the preparation of chirally pure amino acids and dipeptides.

Main Methods:

  • Cyclization of N-(Cbz-aminoacyl)thiosemicarbazides using sulfuric acid.
  • Reaction of 1,3,4-thiadiazoles with N-(Cbz-aminoacyl)- and -dipeptidoylbenzotriazoles.
  • Purification and characterization of the resulting amino acid and dipeptide derivatives.

Main Results:

  • Successful synthesis of novel 1,3,4-thiadiazoles (4a-c).
  • Efficient preparation of chirally pure 1,3,4-thiadiazol-2-yl-substituted amino acids (6a-c).
  • Synthesis of chirally pure 1,3,4-thiadiazol-2-yl-substituted dipeptides (7a-c).

Conclusions:

  • The study established a novel synthetic route to functionalized 1,3,4-thiadiazoles.
  • The developed method allows for the incorporation of the 1,3,4-thiadiazole moiety into amino acids and dipeptides while maintaining chirality.
  • These findings provide valuable building blocks for potential pharmaceutical applications.