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Radical Reactivity: Intramolecular vs Intermolecular01:33

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Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
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Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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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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Nitrene Transfer Radical Relay: A Light-Enabled Strategy for Accessing Tetrahydropyridine.

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This study introduces a novel photochemical method using copper(II) acetylacetonate [Cu(acac)2] to generate nitrene intermediates. This enables efficient synthesis of substituted tetrahydropyridines via a (5 + 1) cycloaddition reaction.

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Catalysis

Background:

  • Nitrene transfer reactions are crucial for forming carbon-nitrogen bonds.
  • Efficient methods for synthesizing complex nitrogen-containing heterocycles are in high demand.

Purpose of the Study:

  • To develop a photochemical nitrene transfer reaction for synthesizing substituted tetrahydropyridines.
  • To utilize copper(II) acetylacetonate [Cu(acac)2] as a catalyst for this transformation.

Main Methods:

  • Photochemical generation of a copper-bound nitrene intermediate.
  • Application of the intermediate in a (5 + 1) cycloaddition reaction with vinyl cyclopropanes.
  • Experimental and computational studies to elucidate the reaction mechanism.

Main Results:

  • Successful synthesis of substituted tetrahydropyridines from vinyl cyclopropanes.
  • The reaction proceeds through nitrene addition to olefin followed by cyclopropane ring-opening.
  • Demonstrated broad applicability via late-stage functionalization of drug derivatives.

Conclusions:

  • The reported Cu(acac)2-catalyzed photochemical reaction provides an efficient route to substituted tetrahydropyridines.
  • This method offers a valuable tool for organic synthesis and drug discovery.
  • The (5 + 1) cycloaddition strategy is versatile for complex molecule synthesis.