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Related Concept Videos

Multi-Step Reactions02:31

Multi-Step Reactions

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Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
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Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Cells often couple the energy-releasing reaction with the energy-requiring one to carry out important cell functions. 
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Reaction Mechanisms03:06

Reaction Mechanisms

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Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
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Determining Order of Reaction02:53

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Rate laws describe the relationship between the rate of a chemical reaction and the concentration of its reactants. In a rate law, the rate constant k and the reaction orders are determined experimentally by observing how the rate of reaction changes as the concentrations of the reactants are changed. A common experimental approach to the determination of rate laws is the method of initial rates. This method involves measuring reaction rates for multiple experimental trials carried out using...
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E1 Reaction: Kinetics and Mechanism02:46

E1 Reaction: Kinetics and Mechanism

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Here, in contrast to the E2 reaction mechanism, we delve into the aspects of the E1 reaction mechanism, which has two steps: rate-limiting loss of the leaving group and abstraction of the beta hydrogen by a weak base. Typically, the experimental proof for the E1 mechanism is via kinetic studies or isotope studies. While the former demonstrates the first-order kinetics—the dependence of the reaction solely on substrate concentration—the latter proves the abstraction of hydrogen only...
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Rate-Determining Steps03:08

Rate-Determining Steps

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Relating Reaction Mechanisms
In a multistep reaction mechanism, one of the elementary steps progresses significantly slower than the others. This slowest step is called the rate-limiting step (or rate-determining step). A reaction cannot proceed faster than its slowest step, and hence, the rate-determining step limits the overall reaction rate.
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Optimization of the Ugi Reaction Using Parallel Synthesis and Automated Liquid Handling
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Still Relevant Today: The Asinger Multicomponent Reaction.

Nefeli Griboura1, Konstantinos Gatzonas1, Constantinos G Neochoritis1

  • 1Chemistry Department, School of Science and Engineering, University of Crete, 70013, Heraklion, Greece.

Chemmedchem
|March 26, 2021
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Summary

The Asinger reaction provides a simple and efficient route to diverse drug-like 3-thiazoline scaffolds. This review details its scope, limitations, and applications in medicinal chemistry and drug discovery.

Keywords:
3-thiazolinesAsinger reactionnon-isocyanide-based multicomponent reactionsoxazolinesprivileged scaffolds

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Heterocyclic Chemistry

Background:

  • The Asinger multicomponent reaction is a key synthetic method.
  • It provides access to valuable drug-like scaffolds, particularly 3-thiazolines.
  • Its versatility stems from accessible starting materials and mild reaction conditions.

Purpose of the Study:

  • To provide a comprehensive review of the Asinger reaction.
  • To analyze its scope, limitations, and variants.
  • To highlight its applications in drug discovery and medicinal chemistry.

Main Methods:

  • Review of existing literature on the Asinger reaction.
  • Analysis of reaction scope, limitations, and starting material diversity.
  • Classification of post-modification strategies for Asinger derivatives.
  • Compilation of applications in drug discovery projects.

Main Results:

  • The Asinger reaction offers a versatile and efficient pathway to 3-thiazolines.
  • Detailed analysis of various reaction conditions and their impact on yield and scope.
  • Identification and classification of common post-modification techniques.
  • Demonstration of the reaction's utility in synthesizing compounds for drug discovery.

Conclusions:

  • The Asinger reaction remains a cornerstone in heterocyclic and medicinal chemistry.
  • Its operational simplicity, mild conditions, and good yields make it highly valuable.
  • The reaction and its derivatives have significant potential in drug discovery endeavors.