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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 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...
Alkylation of β-Diester Enolates: Malonic Ester Synthesis01:14

Alkylation of β-Diester Enolates: Malonic Ester Synthesis

Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
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...
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.
Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

Adrenergic Agonists: Chemistry and Structure-Activity Relationship

Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of the aromatic...

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Related Experiment Video

Updated: Jun 13, 2026

Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine
11:04

Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine

Published on: June 13, 2022

Synthesis of (+/-)-eusynstyelamide A.

Olga V Barykina1, Barry B Snider

  • 1Department of Chemistry MS 015, Brandeis University, Waltham, Massachusetts 02454-9110, USA.

Organic Letters
|May 8, 2010
PubMed
Summary

The total synthesis of (+/-)-eusynstyelamide A was achieved in six steps. Careful exclusion of oxygen enabled efficient NaOH-catalyzed aldol dimerization for the key alpha-ketoamide intermediate.

Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Natural Product Synthesis

Background:

  • Eusynstyelamide A is a marine natural product with potential biological activity.
  • Efficient synthetic routes to complex natural products are crucial for further study and analog development.

Purpose of the Study:

  • To develop a concise and efficient synthetic route for (+/-)-eusynstyelamide A.
  • To investigate the key aldol dimerization step under optimized conditions.

Main Methods:

  • Six-step synthesis starting from 6-bromoindole, methyl glycidate, and Boc-protected agmatine.
  • Sodium hydroxide (NaOH)-catalyzed aldol dimerization of an alpha-ketoamide intermediate.
  • Strict exclusion of oxygen during the dimerization reaction.

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The Logic, Experimental Steps, and Potential of Heterologous Natural Product Biosynthesis Featuring the Complex Antibiotic Erythromycin A Produced Through E. coli

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Last Updated: Jun 13, 2026

Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine
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The Logic, Experimental Steps, and Potential of Heterologous Natural Product Biosynthesis Featuring the Complex Antibiotic Erythromycin A Produced Through E. coli
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Main Results:

  • The total synthesis of (+/-)-eusynstyelamide A was accomplished in an overall yield of 13%.
  • Excluding oxygen from the reaction was critical for the efficient dimerization of the alpha-ketoamide.
  • Boc-protected eusynstyelamide A was successfully obtained via the optimized dimerization.

Conclusions:

  • A viable six-step synthetic pathway to (+/-)-eusynstyelamide A has been established.
  • The study highlights the importance of reaction atmosphere control for specific organic transformations.
  • The developed method provides access to eusynstyelamide A for further biological evaluation.