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Related Concept Videos

β-Dicarbonyl Compounds via Crossed Claisen Condensations01:18

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Crossed Claisen condensations are base-promoted reactions between two different ester molecules producing β-dicarbonyl compounds.  The reaction involving esters, with both containing α hydrogen, results in a mixture of four different products that are difficult to isolate. This reduces the synthetic utility of the reaction.
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Crossed aldol addition is the reaction between two different carbonyl compounds under acidic or basic conditions. Here, both the carbonyl compounds function as nucleophiles and electrophiles. As shown in Figure 1, such a reaction yields a mixture of products, two of which are formed via self-condensation, while the remaining two are formed via crossed-condensation. Without adjustment, the reaction's usefulness in organic chemistry is decreased.
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Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Iron-mediated modular decarboxylative cross-nucleophile coupling.

Grace A Lutovsky1,2, Samuel N Gockel1,3, Mark W Bundesmann4

  • 1Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, WI 53706, USA.

Chem
|August 28, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for directly coupling carboxylic acids using iron salts and photochemistry. This approach avoids costly prefunctionalization and reduces problematic byproducts in chemical synthesis.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Photochemistry

Background:

  • Carboxylic acids are crucial in pharmaceutical discovery due to their stability and diversity.
  • Current decarboxylative coupling methods often require prefunctionalization, adding cost and complexity.
  • Existing methods generate environmentally concerning organic byproducts.

Purpose of the Study:

  • To develop a direct decarboxylative cross-coupling method for native carboxylic acids.
  • To utilize inexpensive, abundant, and nontoxic iron(III) salts as mediators.
  • To enable versatile functionalization without prefunctionalization steps.

Main Methods:

  • Photochemical decarboxylation of carboxylic acids.
  • Radical-polar crossover mechanism.
  • Cross-coupling with nucleophilic partners using Fe(III) catalysis.

Main Results:

  • Successful direct decarboxylative cross-coupling of diverse carboxylic acids.
  • Formation of carbon-carbon, carbon-oxygen, and carbon-nitrogen bonds.
  • Demonstrated generality and efficiency of the Fe(III)-mediated method.

Conclusions:

  • The developed method offers a sustainable and efficient alternative for carboxylic acid functionalization.
  • This approach simplifies library synthesis and reduces environmental impact.
  • Fe(III)-catalyzed photochemistry provides a versatile tool for organic synthesis.