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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.

Prochirality

Prochirality

The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...

[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.

Regioselectivity and Stereochemistry of Hydroboration

Regioselectivity and Stereochemistry of Hydroboration

A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction mixture.

Cycloaddition Reactions: MO Requirements for Thermal Activation

Cycloaddition Reactions: MO Requirements for Thermal Activation

Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.

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C-H functionalization logic in total synthesis.

Will R Gutekunst¹, Phil S Baran

¹Department of Chemistry, The Scripps Research Institute, La Jolla, CA 92037, USA.

Chemical Society Reviews

|February 8, 2011

Summary

This summary is machine-generated.

C-H functionalization offers significant strategic and economic advantages in total synthesis. This review highlights its simplifying effects on synthetic planning through historical and modern case studies.

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Area of Science:

Organic Chemistry
Synthetic Chemistry

Background:

C-H functionalization represents a powerful strategy in organic synthesis.
Its application in total synthesis can streamline complex molecular construction.
Evaluating its strategic and economic benefits is crucial for modern synthetic planning.

Purpose of the Study:

To critically analyze the strategic and economic benefits of C-H functionalization in total synthesis.
To illustrate the simplifying impact of C-H functionalization on synthetic planning.
To provide a comprehensive overview through case studies and expert experience.

Main Methods:

Critical review of existing literature on C-H functionalization in total synthesis.
Analysis of historical and contemporary case studies showcasing successful applications.
Discussion of practical experience in applying a C-H functionalization mindset to synthesis.

Main Results:

C-H functionalization logic demonstrably simplifies synthetic planning.
Case studies reveal significant reductions in synthetic steps and improved efficiency.
Historical and modern examples underscore the evolving impact and versatility of this approach.

Conclusions:

C-H functionalization is a key strategy for efficient and economical total synthesis.
Adopting a C-H functionalization mindset revolutionizes synthetic design.
This approach offers substantial benefits for both academic and industrial chemical synthesis.