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Structure and Nomenclature of Epoxides

Structure and Nomenclature of Epoxides

Cyclic ethers are heterocyclic compounds with an oxygen atom in the ring along with carbon atoms. They are named depending on the number of carbon atoms present in their ring system. Cyclic ethers with a three-membered ring system are called “oxirane”, four-membered ring systems as “oxetane”, five-membered ring systems as “oxolane”, and six-membered ring systems as “oxane”. The cyclic structure of these rings imposes angle strain, and this strain is more in the ring having a smaller number of...

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.

Base-Catalyzed Ring-Opening of Epoxides

Base-Catalyzed Ring-Opening of Epoxides

Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...

[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.

Acid-Catalyzed Ring-Opening of Epoxides

Acid-Catalyzed Ring-Opening of Epoxides

Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...

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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Updated: Jul 14, 2026

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

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

Published on: October 4, 2019

Ryanodane diterpenes from two Erythroxylum species.

Marizeth L Barreiros¹, Juceni P David, Jorge M David

¹Instituto de Química, Universidade Federal da Bahia, Campus de Ondina, 40170-290 Salvador, BA, Brazil.

|June 16, 2007

Summary

Ryanodane diterpenes, 14-O-methyl-ryanodanol and ryanodanol, were isolated from Erythroxylum passerinum. Compound 1 demonstrated insecticidal properties against Aedes aegypti mosquito larvae.

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Published on: November 30, 2018

Area of Science:

Natural Product Chemistry
Entomology
Pharmacognosy

Background:

Erythroxylum passerinum is a plant species known for its diverse chemical constituents.
Ryanodane diterpenes are a class of natural products with potential biological activities.
Previous research has explored the phytochemical profile of Erythroxylum species.

Purpose of the Study:

To isolate and identify ryanodane diterpenes from Erythroxylum passerinum.
To investigate the distribution of these compounds in different parts of the plant and related species.
To evaluate the insecticidal activity of the isolated compounds.

Main Methods:

Phytochemical investigation of ripe fruit and leaves of Erythroxylum passerinum.
Isolation and structural elucidation of compounds using chromatographic and spectroscopic techniques.
Bioassay for insecticidal activity against Aedes aegypti larvae.

Main Results:

Two ryanodane diterpenes, 14-O-methyl-ryanodanol (1) and ryanodanol (2), were successfully isolated.
Compound 2 was identified in the leaves of E. passerinum, and compound 1 was found in the leaves of E. nummularia.
Compound 1 exhibited significant insecticidal activity against Aedes aegypti larvae.

Conclusions:

Erythroxylum passerinum is a source of ryanodane diterpenes.
The distribution of these compounds can vary between plant parts and species.
14-O-methyl-ryanodanol shows promise as a natural insecticide for controlling Aedes aegypti populations.