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Enamine formation involves the addition of carbonyl compounds to a secondary amine through a series of reactions. The mechanism begins with the generation of carbinolamine, a nucleophilic attack followed by several proton transfer reactions. The hydroxyl group of the carbinolamine is converted into water to make a better leaving group that can push the reaction forward by eliminating a water molecule. In enamine formation, the last step involves the abstraction of a proton from the α carbon to...
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Heterocyclic amines, where the N atom is a part of an alicyclic system, are similar in basicity to alkylamines. Interestingly, the heterocyclic amine having a nitrogen atom as part of an aromatic ring has much less basicity than its corresponding alicyclic counterpart. For this reason, as presented in Figure 1, piperidine (pKb = 2.8) is significantly more basic than pyridine (pKb = 8.8).
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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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Aryl Amination Using Soluble Weak Base Enabled by a Water-Assisted Mechanism.

Sii Hong Lau1, Peng Yu1, Liye Chen1

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.

Journal of the American Chemical Society
|November 12, 2020
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This study introduces a novel palladium-catalyzed C-N coupling reaction using triethylamine (Et3N) as a weak base. This method broadens the scope of amination reactions, accommodating sensitive functional groups and enabling new synthetic strategies.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Amination of aryl halides is a crucial C-N bond-forming reaction in synthesis.
  • Traditional methods often require strong inorganic bases, limiting substrate scope and compatibility with sensitive functional groups.
  • Challenges exist in applying these reactions to flow and automated synthesis.

Purpose of the Study:

  • To develop a palladium-catalyzed C-N coupling reaction utilizing a weak, soluble base.
  • To expand the substrate scope and functional group tolerance in amination reactions.
  • To elucidate a novel water-assisted catalytic mechanism.

Main Methods:

  • Palladium-catalyzed cross-coupling reaction.
  • Utilized triethylamine (Et3N) as a weak base.
  • Employed a commercially available ligand, PAd3.
  • Investigated reaction mechanism using mechanistic studies.

Main Results:

  • Achieved efficient C-N coupling with a broad range of aryl halides (bromo- and chloro(hetero)arenes) and amine nucleophiles (primary anilines, secondary amines, amides).
  • Demonstrated tolerance for various base-sensitive functional groups.
  • Established a unique water-assisted catalytic pathway involving a Pd-OH intermediate.

Conclusions:

  • The developed method offers a versatile and compatible approach for amination reactions.
  • The water-assisted mechanism, facilitated by Et3N and PAd3, enables efficient C-N bond formation with sensitive substrates.
  • This advancement has implications for pharmaceutical synthesis, laboratory procedures, and automated/flow chemistry.