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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule02:17

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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
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Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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α-Alkylation of Ketones via Enolate Ions01:10

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Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the...
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[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

3.3K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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Ligand Evolution-Enabled Enantioselective C(sp3)-H Azidation.

He Zhang1, Wei Gu2, Jialian Zheng1

  • 1CCNU-uOttawa Joint Research Centre, State Key Laboratory of Green Pesticide, Engineering Research Center of Photoenergy Utilization for Pollution Control and Carbon Reduction, Ministry of Education, International Joint Research Center for Intelligent Biosensing Technology and Health, College of Chemistry, Central China Normal University (CCNU), 152 Luoyu Road, Wuhan, Hubei 430079, P. R. China.

Journal of the American Chemical Society
|October 21, 2025
PubMed
Summary

Researchers developed a new method for asymmetric azidation of C-H bonds using photoinduced copper catalysis. This approach enables efficient synthesis of chiral azides, crucial for drug discovery and bioactive molecule development.

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Chemoselective Modification of Viral Surfaces via Bioorthogonal Click Chemistry
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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Medicinal Chemistry

Background:

  • Chiral azides are vital building blocks for pharmaceuticals and natural products.
  • Direct asymmetric azidation of C-H bonds remains challenging due to azide reactivity.

Purpose of the Study:

  • To develop a novel method for enantioselective α-C(sp3)-H azidation of carbonyl compounds.
  • To utilize a photoinduced copper-catalyzed system with a unique chiral ligand.

Main Methods:

  • Employing a photoinduced copper-catalyzed radical α-C(sp3)-H azidation.
  • Utilizing a binary bisphosphine and N,N,N-tridentate anionic chiral ligand system.
  • Implementing a 1,5-hydrogen atom transfer (HAT) strategy.

Main Results:

  • Achieved excellent chemo-, regio-, and enantioselectivity in α-carbonyl C-H bond azidation.
  • Demonstrated versatility through postazidation modifications, including synthesis of non-natural amino acids.
  • Successfully installed azide groups in complex bioactive compounds for click chemistry.

Conclusions:

  • The developed method offers a practical route to chiral azides from readily available carbonyl compounds.
  • The ligand system acts as both a photosensitizer and chiral catalyst, crucial for enantioselectivity.
  • DFT studies elucidated a remote SH2 mechanism, guiding catalyst optimization.