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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

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.

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.

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

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

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.

Cycloaddition Reactions: Overview

Cycloaddition Reactions: Overview

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.

Diels–Alder Reaction: Characteristics of Dienes

Diels–Alder Reaction: Characteristics of Dienes

The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is...

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Related Experiment Video

Updated: May 3, 2026

Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes

Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes

Published on: September 12, 2018

Enhancing the Tsuji-Trost Reaction via 1,3-Diene Formation.

Rui Wang^1,2,3, Hong-Die Zeng^1,4, Xian-Xiao Chen¹

¹State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Shanghai 200032, China.

Journal of the American Chemical Society

|May 1, 2026

Summary

This study introduces a novel 1,3-diene pathway for asymmetric allylic deracemization using common substrates. This method overcomes limitations of traditional Tsuji-Trost reactions, enabling efficient synthesis with high enantioselectivity.

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Last Updated: May 3, 2026

Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes

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Published on: September 12, 2018

Utilization of Stop-flow Micro-tubing Reactors for the Development of Organic Transformations

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Published on: January 4, 2018

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs

Published on: January 17, 2020

Area of Science:

Organic Chemistry
Asymmetric Synthesis
Catalysis

Background:

The asymmetric Tsuji-Trost reaction typically requires specific substrates for symmetric π-allyl metal species.
Existing methods face challenges in interconversion deracemization, where transition metals act as both catalyst and nucleophile.

Purpose of the Study:

To present a new mechanistic pathway for efficient allylic deracemization using unsymmetric internal allyl substrates.
To enable diverse allylic electrophiles to react with various nucleophiles with high enantioselectivity.

Main Methods:

Development of a 1,3-diene-formation principle to bypass the classical η³-metal center restriction.
Utilizing common unsymmetric internal allyl substrates and diverse carbon/phosphine nucleophiles.

Main Results:

Achieved efficient allylic deracemization with good enantioconvergence.
Demonstrated stereoselective migration of the entire allyl unit, distinct from prior metal walking models.
Successfully applied the method in convergent synthesis of natural products.

Conclusions:

The 1,3-diene formation is the key deracemization process.
The final allylic substitution step is slow and rate-determining.
This method offers practical value for synthesizing complex molecules.