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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.
Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:22

Direct-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship

Cholinergic agonists or cholinomimetics mimic the action of acetylcholine to stimulate the parasympathetic nervous system. They are categorized into direct-acting and indirect-acting agents. The direct-acting cholinergic drugs induce the parasympathetic response by directly binding to the muscarinic or nicotine receptors. In comparison, the indirect-acting cholinergic drugs prevent acetylcholine hydrolysis, indirectly contributing to the extended parasympathetic response.
The direct-acting...
Spasmolytic Agents: Chemical Classification01:29

Spasmolytic Agents: Chemical Classification

Spasmolytic agents are drugs used to alleviate muscle spasms and spasticity. They can be categorized into different chemical groups based on their mechanisms of action. Centrally acting spasmolytics primarily affect the spinal cord, while others directly target skeletal muscle cells.
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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

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.
Direct-Acting Cholinergic Agonists: Therapeutic Uses01:11

Direct-Acting Cholinergic Agonists: Therapeutic Uses

Direct-acting cholinergic agonists have many therapeutic uses in various medical fields. Choline esters, including acetylcholine, have limited clinical utility due to their non-selectivity and short duration of action. Still, acetylcholine and carbachol are applied topically during ophthalmologic surgery to induce miosis. Pilocarpine, a muscarinic and ganglionic stimulator, effectively treats open-angle glaucoma and alleviates xerostomia and dry mouth caused by radiotherapy or Sjögren syndrome.
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

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Related Experiment Video

Updated: Jul 18, 2026

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products
07:59

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

Published on: October 4, 2019

Clerodane diterpenoids from Salvia splendens.

Gianfranco Fontana1, Giuseppe Savona, Benjamín Rodríguez

  • 1Dipartimento di Chimica Organica E. Paterno, Università degli Studi di Palermo, Parco d'Orleans 2, I-90128 Palermo, Italy.

Journal of Natural Products
|December 28, 2006
PubMed
Summary

Four new clerodane diterpenoids, salvisplendins A-D, were isolated from Salvia splendens flowers. Their structures were determined using NMR spectroscopy and chemical correlation, expanding knowledge of these natural products.

Related Experiment Videos

Last Updated: Jul 18, 2026

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products
07:59

A Customizable Approach for the Enzymatic Production and Purification of Diterpenoid Natural Products

Published on: October 4, 2019

Area of Science:

  • Natural Product Chemistry
  • Phytochemistry
  • Organic Chemistry

Background:

  • Salvia splendens is a plant species known to produce various bioactive compounds.
  • Diterpenoids, a class of natural products, often exhibit significant biological activities.
  • Previous research on Salvia species has identified numerous clerodane diterpenoids.

Purpose of the Study:

  • To isolate and characterize new clerodane diterpenoids from Salvia splendens flowers.
  • To elucidate the structures of these novel compounds using advanced spectroscopic techniques.
  • To provide complete NMR assignments for known compounds isolated from the same source.

Main Methods:

  • Acetone extraction of Salvia splendens flowers.
  • Isolation and purification of compounds using chromatographic techniques.
  • Structure elucidation via 1D and 2D Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Chemical correlation for structural confirmation.

Main Results:

  • Four new clerodane diterpenoids, designated salvisplendins A-D (1-4), were successfully isolated.
  • An artifact (5) formed by diazomethane addition to salvisplendin D (4) was also identified.
  • The known clerodane olearin (6) was isolated, with complete 1H and 13C NMR assignments reported.
  • Structures of new compounds (1-5) were confirmed through spectroscopic analysis and chemical correlation.

Conclusions:

  • The study successfully identified and characterized four novel clerodane diterpenoids from Salvia splendens.
  • The findings contribute to the understanding of the chemical diversity within the Salvia genus.
  • The reported NMR data enhances the characterization of clerodane diterpenoids and related compounds.