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Related Concept Videos

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...
Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview01:07

Preparation of 1° Amines: Hofmann and Curtius Rearrangement Overview

In the presence of an aqueous base and a halogen, primary amides can lose the carbonyl (as carbon dioxide) and undergo rearrangement to form primary amines. This reaction, called the Hofmann rearrangement, can produce primary amines (aryl and alkyl) in high yields without contamination by secondary and tertiary amines.
Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN101:14

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo, or cyano...

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Preparation of N-(2-alkoxyvinyl)sulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines
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Preparation of N-(2-alkoxyvinyl)sulfonamides from N-tosyl-1,2,3-triazoles and Subsequent Conversion to Substituted Phthalans and Phenethylamines

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Solid phase synthesis of 2-aminobenzothiazoles.

Francesco Piscitelli1, Carlo Ballatore, Amos B Smith

  • 1Department of Chemistry, University of Pennsylvania, 231 South 34th St., Philadelphia, PA 19104-6323, United States.

Bioorganic & Medicinal Chemistry Letters
|December 4, 2009
PubMed
Summary

A new traceless solid-phase synthesis method enables efficient production of 2-aminobenzothiazoles. This protocol utilizes resin-bound reagents for streamlined synthesis and library generation of valuable pharmaceutical scaffolds.

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Synthetic Chemistry

Background:

  • 2-aminobenzothiazoles are a privileged scaffold in medicinal chemistry, appearing in numerous biologically active compounds.
  • Traditional synthesis of 2-aminobenzothiazoles can be lengthy and involve harsh conditions, limiting library generation.
  • Solid-phase synthesis offers advantages in purification and automation for drug discovery.

Purpose of the Study:

  • To develop a novel, traceless solid-supported protocol for the synthesis of 2-aminobenzothiazoles.
  • To enable efficient generation of diverse 2-aminobenzothiazole libraries.
  • To provide a versatile platform for further functionalization of the scaffold.

Main Methods:

  • Utilized resin-bound acyl-isothiocyanate and various anilines.
  • Performed cyclization of N-acyl, N'-phenyl-thioureas on a solid support.
  • Employed hydrazine-mediated cleavage for product release from the carboxy-polystyrene resin.

Main Results:

  • Successfully synthesized a small, focused library of 2-aminobenzothiazoles.
  • Demonstrated the traceless nature of the solid-phase protocol.
  • Showcased the ability to elaborate the scaffold prior to cleavage.

Conclusions:

  • The developed solid-phase protocol offers an efficient and versatile route to 2-aminobenzothiazoles.
  • This method facilitates rapid library synthesis for drug discovery efforts.
  • The traceless nature simplifies purification and enhances the utility of the approach.