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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of &#945;-Imino &#947;-Lactones and Alkylidene Pyrazolones
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Acyclic Remote 1,6-Stereoselection.

Karla Janardhan Reddy1, Tapan Kumar Kuilya1, Jin Kun Cha1

  • 1Department of Chemistry, Wayne State University, Detroit, Michigan 48202, United States.

Organic Letters
|August 22, 2022
PubMed
Summary

A new Ti-O linker strategy enables stereochemical control in reactions involving aldehydes. This method simplifies reagent preparation and reveals solvent effects on diastereoselectivity.

Area of Science:

  • Organic Chemistry
  • Stereochemistry
  • Catalysis

Background:

  • Stereochemical control is crucial in organic synthesis.
  • Homopropargylation and homoallylation reactions are important carbon-carbon bond-forming reactions.
  • Existing methods often require pre-functionalized reagents.

Purpose of the Study:

  • To develop a novel strategy for stereoselective homopropargylation and homoallylation of aldehydes.
  • To utilize readily available alcohol derivatives as pronucleophiles.
  • To investigate factors influencing diastereoselectivity.

Main Methods:

  • Employed a Titanium-Oxygen (Ti-O) temporary linker strategy.
  • Used propargylic and allylic alcohol derivatives as pronucleophiles.
  • Analyzed the influence of Grignard reagents and reaction solvents on stereochemical outcomes.

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Main Results:

  • Achieved stereochemical communication in homopropargylation and homoallylation of aldehydes.
  • Demonstrated the utility of alcohol derivatives, avoiding complex reagent synthesis.
  • Observed that 1,6-diastereoselectivity is sensitive to both the Grignard reagent and the solvent.

Conclusions:

  • The Ti-O temporary linker strategy provides an efficient route to stereocontrolled homopropargylation and homoallylation.
  • The use of alcohol derivatives simplifies synthetic procedures.
  • Reaction solvent is a critical parameter influencing diastereoselectivity in these transformations.