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Multiple-Factor-Regulated Enantioselectivity by Halogen Bond Catalysis.

Zhaoyue Wang1, Yanjiang Wang1, Wen-Kai Chen1

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Summary
This summary is machine-generated.

This study reveals how halogen bond (XB) catalysts achieve high enantioselectivity in the Pictet-Spengler reaction. A bidentate iodine(III)-based catalyst showed superior performance, highlighting the role of catalyst structure and interconversion in controlling stereochemistry.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Computational Chemistry

Background:

  • Halogen bond (XB) catalysis offers a sustainable, metal-free route for organic synthesis.
  • Achieving high enantioselectivity in XB catalysis remains a significant challenge.
  • Understanding the microscopic mechanism is crucial for developing superior XB catalysts.

Purpose of the Study:

  • To investigate the mechanism of XB catalyst selectivity in the Pictet-Spengler reaction.
  • To compare the performance of iodine(III)-based and iodine(I)-based XB donors.
  • To provide theoretical guidance for designing efficient enantioselective XB catalysts.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed.
  • Static and thermodynamic analyses were performed.
  • Seven XB donors were evaluated in the Pictet-Spengler reaction of benzaldehyde and N-benzyltryptamine.

Main Results:

  • A bidentate iodine(III)-based catalyst demonstrated superior activity and selectivity.
  • Reaction energy barriers correlated with I···O bond electron density and charge rearrangement.
  • Excellent enantioselectivity was achieved, with specific catalysts reaching ≥99:1 (S:R).

Conclusions:

  • The study clarifies the XB catalytic mechanism in the Pictet-Spengler reaction.
  • Multifactorial control, including interconversion between enantiomers, governs enantioselectivity.
  • Theoretical insights guide the rational design of novel enantioselective XB catalysts.