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Combined Effects of Drugs: Synergism01:27

Combined Effects of Drugs: Synergism

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Synergism is a useful mechanism where combining two or more drugs is more effective than each constituent used alone. Such combinations are also called supra-additive interactions. The drugs collectively enhance the final therapeutic effect by acting on different targets. Another advantage is that the low dose of each constituent drug is sufficient to achieve the desired effect. This helps reduce the duration of therapy and lower the adverse effects of these drugs.
Such synergistic combinations...
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Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

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Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of...
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Diazonium Group Substitution: –OH and –H01:19

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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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Amines to Sulfonamides: The Hinsberg Test01:23

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The Hinsberg test is a method to identify primary, secondary and tertiary amines, named after its pioneer, Oscar Hinsberg. Here, amines are treated with benzenesulfonyl chloride, also known as the Hinsberg reagent, in the presence of an excess of aqueous base, followed by acidification. Based on the nature of the amines, different changes are observed.
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Preparation of 1° Amines: Gabriel Synthesis01:28

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Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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Related Experiment Video

Updated: Jun 15, 2025

Antimicrobial Peptides Produced by Selective Pressure Incorporation of Non-canonical Amino Acids
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Synthesis of novel N-substituted β-amino acid derivatives bearing 2-hydroxyphenyl moieties as promising antimicrobial

Povilas Kavaliauskas1,2,3,4, Birutė Grybaitė1, Birute Sapijanskaite-Banevič1

  • 1Department of Organic Chemistry, Kaunas University of Technology, Kaunas, Lithuania.

Plos One
|June 12, 2025
PubMed
Summary

Novel N-substituted β-amino acid derivatives show promise against drug-resistant bacteria and fungi. Compound 26 is particularly effective against Gram-positive pathogens and Candida albicans, offering a potential new scaffold for antimicrobial development.

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Area of Science:

  • Medicinal Chemistry
  • Microbiology
  • Drug Discovery

Background:

  • Antimicrobial resistance (AMR) is a growing global health threat, necessitating the development of new therapeutic agents.
  • ESKAPE pathogens are a major cause of healthcare-associated infections and are often multidrug-resistant.

Purpose of the Study:

  • To synthesize and evaluate novel N-substituted β-amino acid derivatives with a 2-hydroxyphenyl core for antimicrobial activity.
  • To identify lead compounds effective against multidrug-resistant bacterial and fungal pathogens.

Main Methods:

  • Synthesis of a series of N-substituted β-amino acid derivatives (compounds 2-26).
  • In vitro antimicrobial susceptibility testing using minimum inhibitory concentration (MIC) assays.
  • Evaluation against Gram-positive bacteria, Gram-negative bacteria, and drug-resistant fungi.

Main Results:

  • Compounds 2-26 displayed activity against Gram-positive bacteria, with MICs ranging from 4 to 128 µg/mL.
  • Compounds 9, 16, 17, 18, and 26 showed potent activity against Staphylococcus aureus (MRSA USA300), with MICs of 4-16 µg/mL.
  • Compound 26 demonstrated broad-spectrum activity against S. aureus, Enterococcus faecalis, and Candida albicans, with MICs comparable to control antibiotics.

Conclusions:

  • N-substituted β-amino acid derivatives with a 2-hydroxyphenyl core represent a promising class of antimicrobial agents.
  • Compound 26 is a strong candidate for further development as a novel antimicrobial targeting Gram-positive bacteria and drug-resistant fungi.
  • This scaffold offers potential for developing new treatments against challenging multidrug-resistant infections.