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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 more stable,...

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.

Diels–Alder Reaction: Characteristics of Dienophiles

Diels–Alder Reaction: Characteristics of Dienophiles

In a Diels–Alder reaction, the diene is usually an electron-rich system and acts as a nucleophile, whereas the dienophile is electron-deficient and functions as an electrophile. Much like the diene, the nature of the dienophile significantly impacts the outcome of the reaction.
Characteristics of Dienophiles
Generally, the best dienophiles are alkenes containing electron-withdrawing substituents such as carbonyl, nitrile, and nitro groups. The feasibility of a Diels–Alder reaction depends...

Structure of Conjugated Dienes

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...

Preparation of Diols and Pinacol Rearrangement

Preparation of Diols and Pinacol Rearrangement

Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
The reaction begins with transferring a proton from the acid catalyst to one of the hydroxyl groups, producing an oxonium ion.

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.

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Diterpenoids from Isodon species: an update.

Miao Liu¹, Wei-Guang Wang, Han-Dong Sun

¹State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, 650201, Yunnan, P. R. China. pujianxin@mail.kib.ac.cn.

Natural Product Reports

|August 1, 2017

Summary

This review covers over 600 new diterpenoids from the Isodon genus, detailing their structures, biological activities, and synthesis. Phytochemistry research on Isodon has significantly advanced over the last decade.

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Area of Science:

Natural Product Chemistry
Phytochemistry
Organic Chemistry

Background:

The genus Isodon is a rich source of structurally diverse diterpenoids.
Previous reviews have highlighted the importance of Isodon diterpenoids.
Significant advancements in phytochemistry research have occurred over the past decade.

Purpose of the Study:

To comprehensively review new diterpenoids isolated from the genus Isodon.
To update the knowledge on structures, classifications, and biogenetic pathways.
To summarize recent findings on biological activities and chemical synthesis.

Main Methods:

Literature review of research published from December 2005 to June 2016.
Systematic classification of newly identified diterpenoids.
Analysis of reported bioactivities and synthetic routes.

Main Results:

Over 600 new diterpenoids from the Isodon genus have been identified and characterized.
Diverse structures, including novel skeletons, have been reported.
New insights into biogenetic pathways, bioactivities, and chemical synthesis have emerged.

Conclusions:

The genus Isodon continues to yield a remarkable number of novel diterpenoids.
Ongoing research is expanding our understanding of Isodon diterpenoid chemistry and applications.
This review serves as a valuable resource for researchers in natural product chemistry and drug discovery.