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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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Halogen-Bond-Assisted NHC-Catalyzed (Dynamic) Kinetic Resolution for the Atroposelective Synthesis of Heterobiaryls.

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  • 1Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, Department of Chemistry & Materials Science, Northwest University, Xi'an 710127, P. R. China.

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This study introduces a new method using halogen bonding and N-heterocyclic carbene (NHC) catalysis for synthesizing chiral molecules. The efficient process yields highly enantioselective axially chiral quinolines.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Chiral Synthesis

Background:

  • Axially chiral heterobiaryls are important structural motifs in pharmaceuticals and materials science.
  • Developing efficient and enantioselective synthetic methods for these compounds remains a challenge.
  • N-heterocyclic carbenes (NHCs) are versatile catalysts in organic synthesis.

Purpose of the Study:

  • To develop a novel halogen-bond-assisted N-heterocyclic carbene (NHC)-catalyzed strategy for the synthesis of axially chiral heterobiaryls.
  • To achieve high yields and excellent enantioselectivities in the preparation of these chiral compounds.
  • To elucidate the mechanism of the catalytic reaction, highlighting the role of halogen bonding.

Main Methods:

  • Utilizing N-heterocyclic carbene (NHC) catalysts for (dynamic) kinetic resolution.
  • Employing a specific substrate, 5-bromo-2-iodobenzaldehyde, to facilitate halogen bonding interactions.
  • Optimizing reaction conditions to achieve high enantiomeric excess (ee).

Main Results:

  • Efficient synthesis of a class of axially chiral quinolines was achieved.
  • Excellent enantioselectivities, up to 98% ee, were obtained using only 3-5 mol % NHC catalyst.
  • Mechanistic studies confirmed the critical role of a halogen bonding interaction involving 5-bromo-2-iodobenzaldehyde.

Conclusions:

  • A novel and efficient NHC-catalyzed kinetic resolution strategy has been established for synthesizing axially chiral heterobiaryls.
  • The developed method provides access to valuable chiral quinolines with high enantiopurity.
  • Halogen bonding is identified as a key interaction for the success of this catalytic system.