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Related Concept Videos

Crossed Aldol Reaction Using Strong Bases: Directed Aldol Reaction00:56

Crossed Aldol Reaction Using Strong Bases: Directed Aldol Reaction

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The reaction between two different carbonyl compounds comprising α hydrogen in the presence of a strong base like lithium diisopropylamide (LDA) to form a crossed aldol product is known as a directed aldol reaction. The directed aldol reaction is depicted in Figure 1.
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Crossed Aldol Reactions: Overview01:04

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Crossed aldol addition is the reaction between two different carbonyl compounds under acidic or basic conditions. Here, both the carbonyl compounds function as nucleophiles and electrophiles. As shown in Figure 1, such a reaction yields a mixture of products, two of which are formed via self-condensation, while the remaining two are formed via crossed-condensation. Without adjustment, the reaction's usefulness in organic chemistry is decreased.
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Cycloaddition Reactions: Overview01:16

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

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Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions
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Direct Deaminative C(sp3)-N Cross-Coupling via Copper Catalysis.

Yuqi Yang1, Xidong Pang1, Yi Wei1

  • 1Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education, School of Chemistry and Materials Science, South-Central Minzu University, Wuhan 430074, China.

Organic Letters
|May 6, 2026
PubMed
Summary

Researchers developed a direct copper-catalyzed reaction for coupling aliphatic amines and N-heterocycles. This method uses DPPH as a deaminating reagent to generate alkyl radicals under mild conditions.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Radical Reactions

Background:

  • Direct functionalization of C(sp3)-H bonds remains a challenge.
  • Deaminative coupling reactions offer a pathway for C-N bond formation.
  • Radical-based approaches provide alternative strategies for organic synthesis.

Purpose of the Study:

  • To develop a novel copper-catalyzed deaminative C(sp3)-N coupling reaction.
  • To utilize readily available aliphatic amines and N-heterocycles as substrates.
  • To establish a practical and efficient method for C-N bond formation.

Main Methods:

  • Copper catalysis was employed for the deaminative coupling.
  • DPPH (2,2-diphenyl-1-picrylhydrazyl) was used as an effective deaminating reagent.
  • The reaction involved the in situ generation of reactive alkyl radicals from amines.

Main Results:

  • A wide variety of aliphatic amines and N-heterocycles were successfully coupled.
  • The reaction proceeded under mild conditions.
  • Broad substrate scope was demonstrated, highlighting the versatility of the protocol.

Conclusions:

  • A novel and practical method for direct C(sp3)-N coupling was established.
  • The developed protocol offers a new approach for the transformation of aliphatic amines via radical intermediates.
  • This work expands the toolkit for C-N bond formation in organic synthesis.