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The attack of a nucleophile at the β carbon of an α,β-unsaturated carbonyl compound is called conjugate addition. Conjugate addition reactions of active methylene compounds, such as β-diketones, β-keto esters, β-keto nitriles, and α-nitro ketones, are called Michael addition reactions.
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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Interrupting Base-Mediated Benzofuran Ring Transformation with Michael Acceptors.

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A new two-stage method synthesizes 3-(2-arylbenzofuran-3-yl)propanoates and propanamides using readily available starting materials. This efficient process involves ring-opening, Michael addition, and dehydrative cyclization for target compound synthesis.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • Benzofuran derivatives are important scaffolds in medicinal chemistry.
  • Efficient synthesis of functionalized benzofurans is crucial for drug discovery.

Purpose of the Study:

  • To develop a simple and efficient two-stage synthetic approach for 3-(2-arylbenzofuran-3-yl)propanoates and propanamides.
  • To utilize readily available 3-aroylbenzofurans and simple acrylates/acrylamides as starting materials.

Main Methods:

  • A base-mediated ring opening of 3-aroylbenzofurans.
  • Subsequent one-pot Michael addition with acrylates/acrylamides and deformylation.
  • Acid-mediated dehydrative cyclization of the intermediate products.

Main Results:

  • Successful synthesis of 3-(2-arylbenzofuran-3-yl)propanoates and propanamides.
  • The developed method is a simple two-stage process.
  • Utilizes accessible starting materials and common reagents.

Conclusions:

  • The developed two-stage approach provides an efficient route to valuable benzofuran derivatives.
  • This method offers a practical strategy for synthesizing propanoate and propanamide analogs.