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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Introduction
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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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Iron-Catalyzed, Directed Benzylic Borylation.

Hanbin Lee1, Tiancheng He1, Silas P Cook1

  • 1Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405-7102, United States.

Organic Letters
|December 22, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces an iron-catalyzed reaction for benzylic C-H borylation. It efficiently produces valuable boronic esters from primary and secondary C(sp3)-H bonds under mild conditions.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Benzylic C-H bonds are important synthetic handles.
  • Efficient methods for functionalizing these bonds are highly sought after.
  • Boronic esters are versatile synthetic intermediates.

Purpose of the Study:

  • To develop a novel iron-catalyzed method for benzylic C-H borylation.
  • To achieve high yields of valuable boronic esters.
  • To demonstrate the reaction's efficiency and selectivity.

Main Methods:

  • Iron-catalyzed reaction utilizing specific ligands.
  • Focus on primary and secondary benzylic C(sp3)-H bonds.
  • Optimization of reaction conditions for mildness and speed.

Main Results:

  • Successful borylation of primary and secondary benzylic C-H bonds.
  • High yields of high-value boronic esters achieved.
  • Short reaction times (7-8 minutes) and tolerance of functional groups.
  • Complete site selectivity observed.

Conclusions:

  • An efficient iron-catalyzed benzylic C-H borylation has been established.
  • The method offers a rapid and selective route to valuable boronic esters.
  • This reaction expands the toolbox for C-H functionalization.