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Nomenclature of Carboxylic Acid Derivatives: Amides and Nitriles01:11

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Naming Amides
The IUPAC and common names of amides are derived from the parent carboxylic acid, by replacing the suffix “oic acid” and “ic acid,” respectively, with “amide.” In the following example, the IUPAC name ethanamide is derived from ethanoic acid, and the common name, acetamide, is obtained from acetic acid.
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Alkylation of β-Diester Enolates: Malonic Ester Synthesis01:14

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Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.
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Acid Halides to Amides: Aminolysis01:07

Acid Halides to Amides: Aminolysis

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Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
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Bioavailability Enhancement: Drug Permeability Enhancement01:27

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Body:After oral administration, poor permeability often limits the rate at which drugs are absorbed through the intestinal epithelium. Enhancing drug permeability is crucial for effective therapy, and several strategies have been developed to overcome this challenge.One effective strategy involves the use of lipid-based formulations. These formulations enhance dissolution and solubility, targeting physiological mechanisms to increase drug absorption. This includes stimulating bile salt...
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Diazonium Group Substitution: –OH and –H01:19

Diazonium Group Substitution: –OH and –H

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Nitrous acid, a weak acid, is prepared in situ via the reaction of sodium nitrite with a strong acid under cold conditions. This nitrous acid prepared in situ reacts with primary arylamines to form arenediazonium salts. Such reactions are known as diazotization reactions. As shown in Figure 1, the formation of arenediazonium salts begins with the decomposition of nitrous acid in an acidic solution to give nitrosonium ions.
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Carboxylic Acid Derivatives: Overview01:15

Carboxylic Acid Derivatives: Overview

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Carboxylic acid derivatives are formed by replacing the hydroxyl group of carboxylic acids with a different functional group. The most common carboxylic acid derivatives are:
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Extending the Salinilactone Family.

Christian Schlawis1, Tim Harig1, Stephanie Ehlers1

  • 1Institut für Organische Chemie, TU Braunschweig, Hagenring 30, 38106, Braunschweig, Germany.

Chembiochem : a European Journal of Chemical Biology
|January 21, 2020
PubMed
Summary

Five new salinilactones (D-H) from Salinispora bacteria were discovered. These bicyclic lactones show varied side chains and exhibit significant growth inhibition and cytotoxicity.

Keywords:
A-factorGC/MSbiosynthesismicrobial volatilestoxic compounds

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Area of Science:

  • Marine natural products chemistry
  • Microbial secondary metabolites
  • Bacterial chemical ecology

Background:

  • Salinispora bacteria are known producers of bioactive secondary metabolites.
  • Salinilactones A-C, a previously reported class of bicyclic lactones, were isolated from Salinispora.
  • Understanding the diversity and bioactivity of microbial metabolites is crucial for drug discovery.

Purpose of the Study:

  • To report the discovery and structural elucidation of five new salinilactones (D-H).
  • To investigate the distribution of salinilactones across different Salinispora species.
  • To evaluate the biological activity, including growth inhibition and cytotoxicity, of the salinilactone family.

Main Methods:

  • Gas chromatography-mass spectrometry (GC/MS) for identification.
  • Determination of gas chromatographic retention indices.
  • Comparison with authentic synthetic samples for structural confirmation.
  • Culturing and chemical analysis of six Salinispora species.

Main Results:

  • Five new salinilactones, designated D-H, were identified, characterized by variations in their alkyl side chains.
  • The occurrence of salinilactones was analyzed across six newly proposed Salinispora species, revealing variability in production.
  • Salinilactones demonstrated significant growth-inhibiting effects on various biological systems, including non-Salinispora actinomycetes.
  • Strong evidence for significant cytotoxicity of these bicyclic lactones was found.

Conclusions:

  • The salinilactone family is structurally diverse, with new members (D-H) exhibiting modified side chains.
  • Salinilactone production varies among Salinispora taxa, suggesting potential ecological or evolutionary drivers.
  • The salinilactone family possesses potent antimicrobial and cytotoxic properties, highlighting their potential as leads for therapeutic development.