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Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis

Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis

Acetoacetic ester synthesis is a method to obtain ketones from alkyl halides and β-keto esters. The reaction occurs in the presence of an alkoxide base that abstracts the acidic proton of the β-keto esters. The step results in an enolate ion which is doubly stabilized. The enolate then reacts with an alkyl halide via the SN2 process to produce an alkylated ester intermediate with a new C–C bond. The hydrolysis of the intermediate, followed by acidification, results in an alkylated β-keto acid.

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Preparation of Amides

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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.
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Related Experiment Video

Updated: May 14, 2026

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

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Published on: November 27, 2015

Total synthesis of kottamide E.

Thomas B Parsons¹, Neil Spencer, Chi W Tsang

¹School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.

Chemical Communications (Cambridge, England)

|February 12, 2013

Summary

This summary is machine-generated.

Researchers report the first synthesis of kottamide E, a marine natural product. This complex molecule features a dibromoindole core linked to a unique amino acid containing a 1,2-dithiolane ring.

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Area of Science:

Marine Natural Products Chemistry
Organic Synthesis
Medicinal Chemistry

Background:

Marine natural products often possess unique structural features and potent biological activities.
Kottamide E is a marine natural product with a complex structure that has not been previously synthesized.
The 1,2-dithiolane moiety is an unusual structural feature in amino acids.

Purpose of the Study:

To achieve the first total synthesis of kottamide E.
To develop synthetic strategies for complex marine natural products containing unusual functional groups.
To provide access to kottamide E for further biological evaluation.

Main Methods:

Multi-step organic synthesis involving key steps such as indole functionalization and enamide formation.
Construction of the 1,2-dithiolane-containing amino acid.
Stereoselective synthesis to control the (Z)-geometry of the enamide linkage.

Main Results:

Successful synthesis of kottamide E, confirming its proposed structure.
The synthesis established a route to the 5,6-dibromoindole core and the novel amino acid.
The (Z)-enamide linkage was efficiently formed, a critical step in the synthesis.

Conclusions:

The first total synthesis of kottamide E was accomplished.
This work demonstrates a viable synthetic route to a complex marine natural product.
The synthetic methodology developed could be applicable to other structurally related natural products.