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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.
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.
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.
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[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.
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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Three new compounds from Dictamnus dasycarpus.

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

  • 1School of Traditional Chinese Materia Medica, Shenyang Pharmaceutical University, Shenyang, 110016, China.

Journal of Asian Natural Products Research
|January 18, 2012
PubMed
Summary
This summary is machine-generated.

Researchers identified three novel chemical compounds from Dictamnus dasycarpus root bark. These new compounds, dasycarpusenester A, dasycarpusester B, and dasycarpusacid, were structurally characterized using advanced spectroscopic and chemical methods.

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Published on: October 2, 2016

Area of Science:

  • Natural Product Chemistry
  • Organic Chemistry
  • Pharmacognosy

Background:

  • Dictamnus dasycarpus is a traditional medicinal plant.
  • Root bark extracts are a rich source of bioactive compounds.
  • Understanding the phytochemical profile is crucial for its medicinal applications.

Purpose of the Study:

  • To isolate and characterize new chemical constituents from Dictamnus dasycarpus root bark.
  • To elucidate the structures of novel compounds using spectroscopic and chemical techniques.

Main Methods:

  • Extraction of ethyl acetate from Dictamnus dasycarpus root bark.
  • Isolation of compounds using chromatographic techniques.
  • Structure elucidation via Nuclear Magnetic Resonance (NMR) spectroscopy, Mass Spectrometry (MS), and chemical analysis.

Main Results:

  • Three new compounds were isolated and identified: dasycarpusenester A (1), dasycarpusester B (2), and dasycarpusacid (3).
  • The structures were determined as (2S)-4-(2,2-dimethyl-5-oxotetrahydrofuran-3-yl)-2-hydroxypent-3-enoic acid methyl ester (1), (2R)-4-(2,2-dimethyl-5-oxotetrahydrofuran-3-yl)-2-hydroxypent-3-anoic acid methyl ester (2), and (2S)-4-(2,2-dimethyl-5-oxotetrahydrofuran-3-yl)-2-hydroxypent-3-anoic acid (3).

Conclusions:

  • The phytochemical investigation successfully identified three previously unknown compounds from Dictamnus dasycarpus.
  • The structural elucidation provides valuable data for further research into the biological activities and potential applications of these compounds.