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Related Concept Videos

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[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.
Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives01:35

Loss of Carboxy Group as CO2: Decarboxylation of Malonic Acid Derivatives

Just like β-keto acids—which upon thermal decarboxylation form ketones—β-dicarboxylic acids undergo decarboxylation to generate monocarboxylic acids with the liberation of carbon dioxide.
Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization01:13

Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization

Dieckmann cyclization is an intramolecular Claisen condensation of diesters. The reaction occurs in the presence of a base and generates a cyclic β-ketoester as the final product. Commonly, 1, 6 and 1, 7-diesters are preferred substrates for the reaction since the generated five, and six-membered cyclic β-keto esters are particularly more stable.
β-Dicarbonyl Compounds via Crossed Claisen Condensations01:18

β-Dicarbonyl Compounds via Crossed Claisen Condensations

Crossed Claisen condensations are base-promoted reactions between two different ester molecules producing β-dicarbonyl compounds. The reaction involving esters, with both containing α hydrogen, results in a mixture of four different products that are difficult to isolate. This reduces the synthetic utility of the reaction.
Structure of Conjugated Dienes01:16

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...
Diels–Alder Reaction: Characteristics of Dienes01:29

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, the...

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Applications of Liquid-Chromatography Tandem Mass Spectrometry in Natural Products Research: Tropane Alkaloids as a Case Study
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Two new compounds from Dictamnus dasycarpus.

Li-Na Guo1, Yue-Hu Pei, Gang Chen

  • 1School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, China. gln65@126.com

Journal of Asian Natural Products Research
|February 3, 2012
PubMed
Summary
This summary is machine-generated.

Two novel compounds, dictamnaindiol (a pyrrolidine alkaloid) and dictamnadiol (a sesquiterpene derivative), were isolated from Dictamnus dasycarpus root bark. Their structures were identified using spectral and chemical analyses.

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Area of Science:

  • Natural Product Chemistry
  • Phytochemistry
  • Organic Chemistry

Background:

  • Dictamnus dasycarpus (D. dasycarpus) is a medicinal plant with a history of traditional use.
  • Root barks of D. dasycarpus are known sources of bioactive secondary metabolites.
  • Exploring the chemical constituents of D. dasycarpus can lead to the discovery of novel compounds.

Purpose of the Study:

  • To isolate and characterize new chemical entities from the root barks of Dictamnus dasycarpus.
  • To elucidate the structures of these novel compounds using comprehensive analytical techniques.
  • To contribute to the understanding of the phytochemical diversity of D. dasycarpus.

Main Methods:

  • Extraction of the ethanolic extract from D. dasycarpus root barks.
  • Fractionation of the extract using ethyl acetate (EtOAc) solubility.
  • Isolation of compounds using chromatographic techniques.
  • Structure elucidation through detailed spectral analysis (NMR, MS) and chemical methods.

Main Results:

  • Isolation of two new compounds: dictamnaindiol, a pyrrolidine alkaloid, and dictamnadiol, an eudesmane-type sesquiterpene derivative.
  • Determination of the chemical structures of dictamnaindiol as (3α,4β)-3-(6-ethoxy-6-(4-hydroxyphenyl)methyl)-4-(4-hydroxyphenyl)-1-methyl-pyrrolidin-2-one.
  • Determination of the chemical structures of dictamnadiol as (1R, 4S, 7S, 10R)-1,11-dihydroxyl-4,14-epoxy-5(6)-eudesmene.

Conclusions:

  • The study successfully identified two previously unknown compounds from Dictamnus dasycarpus.
  • The structural elucidation provides valuable data on the chemical profile of this plant species.
  • These findings expand the knowledge of natural products and may serve as a basis for future pharmacological investigations.