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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
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The Wittig reaction, which converts aldehydes or ketones to alkenes using phosphorus ylides, proceeds through a nucleophilic addition‒elimination process.
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The Wittig reaction is the conversion of carbonyl compounds-aldehydes and ketones-to alkenes using phosphorus ylides, or the Wittig reagent. The reaction was pioneered by Prof. Georg Wittig, for which he was awarded the Nobel Prize in Chemistry.
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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
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Sterically Controlled Late-Stage Functionalization of Bulky Phosphines.

Hao Deng1, Marco Bengsch1, Nico Tchorz1

  • 1Department of Heterogeneous Catalysis, Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 5, 2022
PubMed
Summary

Researchers developed a new orthogonal functionalization strategy for arylphosphines, enabling modification at previously inaccessible positions. This method bypasses phosphorus-directed limitations, expanding ligand diversity for metal-phosphine catalysis.

Keywords:
borylationiridium catalysislate-stage functionalizationligand librariesphosphines

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Ligand Synthesis

Background:

  • Metal-phosphine catalysis is crucial, requiring precisely tuned phosphine ligands.
  • Current methods for phosphine ligand diversification often rely on phosphorus-directed C-H functionalization, limiting modification sites.
  • A need exists for orthogonal strategies to access novel phosphine structures.

Purpose of the Study:

  • To develop an orthogonal functionalization strategy for arylphosphines.
  • To enable the introduction of substituents at previously inaccessible positions.
  • To expand the scope of phosphine ligand diversity for catalysis.

Main Methods:

  • Employed a sterically controlled borylation of bulky phosphines, where the phosphine group acts as a bystander.
  • Utilized the resulting borylated phosphines as supporting ligands for palladium.
  • Performed diversification via phosphine self-assisted Suzuki-Miyaura reactions.

Main Results:

  • Successfully introduced a range of substituents into previously inaccessible positions on arylphosphines.
  • Demonstrated an orthogonal functionalization strategy distinct from phosphorus-directed methods.
  • The borylated phosphines effectively supported palladium catalysis in Suzuki-Miyaura cross-coupling reactions.

Conclusions:

  • The developed orthogonal strategy significantly expands the accessible chemical space of phosphine ligands.
  • This approach offers a powerful tool for fine-tuning metal-phosphine-catalyzed reactions.
  • The methodology provides rapid access to diverse phosphine derivatives based on privileged scaffolds.