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

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Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
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Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis01:07

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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...
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Preparation of 1° Amines: Gabriel Synthesis01:28

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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.
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The pinacol and McMurry reactions involve the reductive coupling of ketones or aldehydes. Similarly, the bimolecular reductive coupling of two ester molecules in the presence of sodium metal in an aprotic solvent yields an α-hydroxy ketone product. The α-hydroxy ketone is also called acyloin, so the reaction is referred to as ‘acyloin condensation.’
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Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism01:13

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Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.
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Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

2.3K
Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
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Concise Synthesis of (-)-GA18 Methyl Ester.

Lei Li1,2, Weida Liang2, Mario E Rivera1,2

  • 1Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States.

Journal of the American Chemical Society
|December 27, 2022
PubMed
Summary

Researchers synthesized (-)-GA18 methyl ester, a rare gibberellin (GA), from readily available andrographolide. This study provides a new synthetic route for gibberellins, crucial plant hormones with limited natural availability.

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Area of Science:

  • Organic Chemistry
  • Plant Biology
  • Synthetic Chemistry

Background:

  • Gibberellins (GAs) are vital plant hormones regulating growth and development.
  • Certain gibberellin family members, like GA18, are scarce in nature, hindering research and application.
  • A reliable synthesis of GA18 is needed to overcome natural supply limitations.

Purpose of the Study:

  • To develop a concise and efficient synthesis of (-)-GA18 methyl ester.
  • To utilize a commercially available and inexpensive starting material, andrographolide.
  • To explore novel synthetic strategies for constructing complex gibberellin structures.

Main Methods:

  • Intramolecular ene reaction for C ring formation.
  • Oxidative cleavage and aldol condensation for ring contraction and AB ring construction.
  • Photochemical [2+2] cycloaddition and SmI2-mediated rearrangement for CD ring synthesis.

Main Results:

  • Successful synthesis of (-)-GA18 methyl ester from andrographolide.
  • Demonstrated utility of key reactions including ene reaction, aldol condensation, and photochemical cycloaddition.
  • Established a viable route to a challenging C20 gibberellin.

Conclusions:

  • The developed synthetic route provides access to the limited natural product (-)-GA18 methyl ester.
  • This synthesis highlights innovative methods for constructing complex polycyclic systems found in gibberellins.
  • The findings contribute to the broader understanding of gibberellin biosynthesis and synthetic chemistry.