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Highly Efficient Method for Suzuki Reactions in Aqueous Media.

Xinglong Zhou1, Xuming Guo1, Fangfang Jian1

  • 1School of Chemical Engineering and Pharmaceutics, Henan University of Science and Technology, Luoyang, Henan 471003, P. R. China.

ACS Omega
|August 29, 2019
PubMed
Summary

A novel palladium catalyst, PdCl2(L @β-CD), efficiently drives Suzuki cross-coupling reactions in water. This recyclable catalyst enables reactions with low palladium loadings, yielding biaryl compounds in excellent results.

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Area of Science:

  • Organometallic Chemistry
  • Supramolecular Chemistry
  • Catalysis

Background:

  • Cyclodextrins are versatile hosts with tunable properties.
  • Palladium catalysis is crucial for C-C bond formation.
  • Developing efficient and recyclable catalysts is a key challenge in organic synthesis.

Purpose of the Study:

  • To synthesize and characterize a novel cyclodextrin-based palladium catalyst.
  • To investigate the catalytic activity of PdCl2(L @β-CD) in Suzuki cross-coupling reactions.
  • To evaluate the efficiency, mildness, and recyclability of the developed catalytic system.

Main Methods:

  • Crystal structure determination of mono-6-(l-aminopropanol)-deoxy-β-cyclodextrin (L @β-CD).
  • In situ synthesis of the palladium catalyst, PdCl2(L @β-CD).
  • Application of the catalyst in Suzuki cross-coupling reactions under mild conditions, including aqueous media.

Main Results:

  • The crystal structure of L @β-CD was successfully determined.
  • PdCl2(L @β-CD) demonstrated high catalytic efficiency in Suzuki cross-couplings, even at low palladium loadings (0.01 mol %).
  • Excellent yields of biaryl compounds were achieved, and the catalyst proved to be recyclable.

Conclusions:

  • A novel and highly efficient palladium catalyst supported by a modified cyclodextrin ligand was developed.
  • The catalyst facilitates Suzuki cross-coupling reactions under environmentally benign conditions (water) with remarkable efficiency and recyclability.
  • This work offers a promising approach for sustainable palladium-catalyzed cross-coupling reactions.