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Boron-Mediated Regioselective Aromatic C-H Functionalization via an Aryl BF2 Complex.

Ganesh H Shinde1, Henrik Sundén1,2

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Chemistry (Weinheim an Der Bergstrasse, Germany)
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A new method enables regioselective functionalization of heteroarenes and aldehydes using an azaaryl boron difluoride (BF2) complex. This approach allows for diverse modifications and late-stage applications in organic synthesis.

Keywords:
BBr3N-heterocyclesSelectfluoraryl-aldehydesortho C−H halogenationregioselective

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Catalysis

Background:

  • Regioselective functionalization is crucial for synthesizing complex organic molecules.
  • Existing methods often lack broad substrate scope or require harsh conditions.
  • Azaaryl boron difluoride (BF2) complexes offer unique reactivity profiles.

Purpose of the Study:

  • To develop an efficient and regioselective method for functionalizing 2-aryl-heteroarenes and aryl aldehydes.
  • To explore the mechanistic pathway involving ligand exchange and C-B bond cleavage.
  • To demonstrate the utility of the developed method for late-stage functionalization and skeleton remodeling.

Main Methods:

  • Utilized a novel azaaryl BF2 complex for regioselective functionalization.
  • Investigated the reaction mechanism, including fluoride to bromide ligand exchange and C-B bond cleavage.
  • Applied the method to a broad range of heteroarenes and aryl aldehydes.

Main Results:

  • Achieved high yields and excellent regioselectivity in the functionalization of various substrates.
  • Successfully introduced diverse functional groups, including chloro, bromo, iodo, hydroxyl, amine, and BF2.
  • Demonstrated the applicability of the method for late-stage functionalization and cross-coupling reactions.

Conclusions:

  • The developed azaaryl BF2 complex strategy provides an efficient route for regioselective functionalization.
  • The method offers a broad substrate scope and tolerance for various functional groups.
  • This approach facilitates rapid skeleton remodeling and late-stage diversification in organic synthesis.