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Radical Anti-Markovnikov Addition to Alkenes: Overview01:25

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α-Halogenation of aldehydes and ketones is a reaction involving the substitution of α hydrogens with halogens in the presence of a base.  The reaction begins with the abstraction of  α hydrogen by the base to produce a nucleophilic enolate ion. This intermediate undergoes a subsequent nucleophilic substitution with the halogen to produce a monohalogenated carbonyl compound. If the starting substrate has more than one α hydrogen, it is difficult to stop the reaction...
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Introduction
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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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The reaction of hydrogen bromide with alkenes in the presence of hydroperoxides or peroxides proceeds via anti-Markovnikov addition. The radical chain reaction comprises initiation, propagation, and termination steps.
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Sequential α/β-C-H Functionalization of Monosubstituted Aliphatic Alkenes.

Yini Wang1, Bingbing Xie1, Chengxing Peng1

  • 1Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Zhejiang Key Laboratory of Organosilicon Material Technology, College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, Zhejiang, China.

Organic Letters
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Summary

This study introduces a novel method for sequential C-H functionalization of monosubstituted aliphatic alkenes. The new protocol enables efficient alkenylation, allylation, and alkynylation with high selectivity.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • Monosubstituted alkenes are crucial building blocks in organic synthesis.
  • Chelation-assisted alkenyl C-H functionalization has advanced, but challenges remain for monosubstituted aliphatic alkenes due to reactivity and selectivity.

Purpose of the Study:

  • To develop the first sequential α/β-C-H functionalization protocol for monosubstituted aliphatic alkenes.
  • To address the limitations in reactivity and selectivity for these challenging substrates.

Main Methods:

  • Utilized bishomoallyl amines as starting materials.
  • Developed a sequential C-H functionalization strategy targeting both alpha and beta positions.

Main Results:

  • Achieved successful C-H alkenylation, allylation, and alkynylation.
  • Demonstrated wide functional group tolerance.
  • Obtained products with excellent regio- and stereoselectivity.

Conclusions:

  • The developed protocol represents a significant advancement in the C-H functionalization of monosubstituted aliphatic alkenes.
  • This method offers a versatile and efficient route to complex organic molecules.