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Aldol Condensation with β-Diesters: Knoevenagel Condensation

Aldol Condensation with β-Diesters: Knoevenagel Condensation

The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.

Crossed Aldol Reaction Using Strong Bases: Directed Aldol Reaction

Crossed Aldol Reaction Using Strong Bases: Directed Aldol Reaction

The reaction between two different carbonyl compounds comprising α hydrogen in the presence of a strong base like lithium diisopropylamide (LDA) to form a crossed aldol product is known as a directed aldol reaction. The directed aldol reaction is depicted in Figure 1.

C–C Bond Formation: Aldol Condensation Overview

C–C Bond Formation: Aldol Condensation Overview

Aldol condensation is an important route in synthetic organic chemistry used to generate a new carbon–carbon bond under basic or acidic conditions. The aldol condensation reaction presented in Figure 1 constitutes an aldol addition reaction followed by the dehydration process.

Intramolecular Aldol Reaction

Intramolecular Aldol Reaction

Intramolecular aldol reaction occurs in dicarbonyl compounds such as dialdehydes, diketones, and keto-aldehydes. The dicarbonyl compounds possess more than one nucleophilic ⍺ carbon for the base to deprotonate and form the enolates. For example, in symmetrical diketones, there are four ⍺ carbons. Hence, four types of enolates are possible when treated with a base. However, since the molecule is symmetrical, the enolates formed on either side of one carbonyl group are equivalent to those formed...

Acid-Catalyzed Aldol Addition Reaction

Acid-Catalyzed Aldol Addition Reaction

The aldol reaction of a ketone under acidic conditions successfully forms an unsaturated carbonyl as the final product instead of an aldol. The acid-catalyzed aldol reaction is depicted in Figure 1.

Aldol Condensation vs Claisen Condensation

Aldol Condensation vs Claisen Condensation

Aldol condensation is an acid or base-catalyzed condensation between aldehydes or ketones to give an α,ꞵ-unsaturated carbonyl compound. A base-promoted condensation between ester molecules to produce a ꞵ-ketoester is known as the Claisen condensation. In the presence of a base, both reactions involve deprotonation of the acidic α hydrogen to produce the corresponding enolates. The nucleophilic enolates attack their respective nonenolized carbonyl compound forming a tetrahedral intermediate.

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

Artificial aldolases from peptide dendrimer combinatorial libraries.

Jacob Kofoed¹, Tamis Darbre, Jean-Louis Reymond

¹Department of Chemistry and Biochemistry, University of Berne, Freiestrasse 3, CH-3012, Berne, Switzerland.

Organic & Biomolecular Chemistry

|October 13, 2006

Summary

Synthetic peptide dendrimers mimic aldolase enzymes, catalyzing aldol reactions efficiently in water and organic solvents. These novel dendrimer catalysts show a positive dendritic effect, achieving high yields and enantioselectivity.

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Area of Science:

Synthetic chemistry
Biomimetic catalysis
Enzyme modeling

Background:

Aldolase enzymes are crucial biocatalysts for aldol reactions.
Developing synthetic mimics of enzyme active sites is a key challenge in catalysis.
Peptide dendrimers offer a versatile scaffold for creating artificial enzyme active sites.

Purpose of the Study:

To design and synthesize peptide dendrimers as functional mimics of aldolase enzymes.
To investigate the catalytic activity and selectivity of these dendrimers in aldol reactions.
To explore the influence of dendrimer architecture and active residues on catalytic performance.

Main Methods:

Preparation of combinatorial peptide dendrimer libraries incorporating lysine and proline residues.
On-bead selection using dye-labelled 1,3-diketone and fluorogenic enolization probes to identify active catalysts.
Catalytic evaluation of aldolase dendrimers in aldol reactions with various substrates (acetone, dihydroxyacetone, cyclohexanone, nitrobenzaldehyde).

Main Results:

Dendrimers demonstrated significant aldolase activity, comparable to enzymes, in both aqueous and organic media.
Catalysis achieved complete conversion within 3 hours at 25°C using only 1 mol% catalyst.
Aldol products were obtained with up to 65% enantiomeric excess (ee), indicating high stereoselectivity.

Conclusions:

Peptide dendrimers effectively mimic aldolase enzyme function, providing a robust platform for artificial enzymes.
A positive dendritic effect was observed, enhancing catalytic efficiency and selectivity.
These biomimetic dendrimers offer a promising approach for developing efficient and selective synthetic catalysts.