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Indirect-acting cholinergic agonists, or anticholinesterases, enhance the body's cholinergic activity by inhibiting acetylcholine's breakdown. They are categorized as reversible or irreversible agents based on their mechanism of action. They are further classified into short-acting, intermediate-acting, and long-acting agents based on their duration of action.
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Indirect-Acting Cholinergic Agonists: Chemistry and Structure-Activity Relationship01:29

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Indirect-acting cholinergic agonists are agents that interact with the acetylcholinesterase enzyme in the synaptic cleft, preventing the breakdown of acetylcholine into choline and acetate. Consequently, the concentration of acetylcholine in the synaptic cleft increases. These agonists can be classified into reversible and irreversible inhibitors based on their duration of action.
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The elimination half-life and drug clearance of drugs following nonlinear kinetics can vary with dosage. The Michaelis-Menten parameters and drug concentration influence these factors. As the dose increases, the elimination half-life tends to lengthen, resulting in a reduction in clearance and a disproportionately larger area under the curve. The total clearance can be derived from the Michaelis-Menten equation for drugs following a one-compartment model.
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Adrenergic Agonists: Chemistry and Structure-Activity Relationship01:16

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Direct-acting cholinergic agonists, such as synthetic choline esters and naturally occurring alkaloids, exert their effects by enhancing the actions of acetylcholine and stimulating the parasympathetic nervous system. Synthetic choline esters share structural similarities with acetylcholine. For example, they have a positively charged quaternary ammonium or onium group, contributing to their hydrophilic characteristics. As a result, they are poorly absorbed in the body through oral...
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Development of a Backbone Cyclic Peptide Library as Potential Antiparasitic Therapeutics Using Microwave Irradiation
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Arylpentazoles with surprisingly high kinetic stability.

Xiao-Xu Bo1, Zhi-Yong Dong2, Yi-Hong Ding1

  • 1Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, P. R. China and Key Laboratory of Carbon Materials of Zhejiang Province, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou 325035, P. R. China. yhdd@jlu.edu.cn.

Chemical Communications (Cambridge, England)
|April 30, 2021
PubMed
Summary
This summary is machine-generated.

Newly developed co-stabilization methods enhance the kinetic stability of arylpentazoles. This breakthrough overcomes previous limitations, enabling broader applications for these century-old compounds in chemical synthesis.

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Area of Science:

  • Organic Chemistry
  • Chemical Kinetics
  • Computational Chemistry

Background:

  • Arylpentazoles, known for over a century, possess inherent kinetic instability.
  • Their application is limited to in situ generation of the pentazole anion due to poor stability.

Purpose of the Study:

  • To enhance the kinetic stability of arylpentazoles.
  • To enable broader applications of arylpentazoles by overcoming stability limitations.

Main Methods:

  • A novel co-stabilization strategy was proposed and investigated.
  • Computational chemistry methods, specifically the CBS-QB3 level, were employed for theoretical calculations.

Main Results:

  • The N2-leaving barrier of arylpentazoles was significantly increased.
  • The highest recorded N2-leaving barrier reached 40.83 kcal mol-1.
  • The co-stabilization method proved effective in enhancing kinetic stability.

Conclusions:

  • The developed co-stabilization method successfully enhances arylpentazole kinetic stability.
  • This advancement makes arylpentazoles more amenable to broader chemical applications.
  • The findings pave the way for utilizing arylpentazoles beyond in situ generation.