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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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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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Ylide formal [4 + 1] annulation.

Chunyin Zhu1, Ya Ding, Long-Wu Ye

  • 1School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, P. R. China. zhucycn@gmail.com.

Organic & Biomolecular Chemistry
|January 31, 2015
PubMed
Summary
This summary is machine-generated.

Ylide [4 + 1] annulation reactions offer a versatile method for synthesizing diverse five-membered heterocyclic compounds. This review highlights recent advances in ylide annulation, focusing on product scope, selectivity, and mechanistic insights.

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • Ylide chemistry has evolved beyond traditional olefination and small ring formation.
  • Ylide [4 + 1] annulation has emerged as a powerful strategy for constructing five-membered rings.

Purpose of the Study:

  • To provide an overview of recent advances in ylide [4 + 1] annulation reactions.
  • To highlight the product diversity, selectivity, and applicability of these transformations.
  • To present mechanistic rationales where available.

Main Methods:

  • Review of recent literature on ylide [4 + 1] annulation.
  • Analysis of reaction outcomes, including product types and stereoselectivity.
  • Discussion of proposed reaction mechanisms.

Main Results:

  • Ylide [4 + 1] annulation enables the efficient synthesis of various five-membered heterocycles, including dihydrofurans, isoxazolines, pyrrolines, indoles, dihydropyrazoles, and cyclopentenones.
  • The methodology demonstrates broad applicability and tunable selectivity.
  • Mechanistic studies provide insights into the reaction pathways.

Conclusions:

  • Ylide [4 + 1] annulation is a valuable synthetic tool for accessing diverse five-membered heterocyclic scaffolds.
  • Continued exploration of ylide annulation promises further expansion of its synthetic utility and mechanistic understanding.