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Related Concept Videos

Reaction Mechanisms03:06

Reaction Mechanisms

30.4K
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.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
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Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
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Radical Reactivity: Overview01:11

Radical Reactivity: Overview

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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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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.
The concept of rate-determining step can be understood from the analogy of a 4-lane freeway with a short-stretch of traffic-bottleneck caused due to...
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Multi-Step Reactions02:31

Multi-Step Reactions

8.5K
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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SN2 Reaction: Mechanism02:27

SN2 Reaction: Mechanism

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The kinetic studies of SN2 reactions suggest an essential feature of its mechanism: it is a single-step process without intermediates. Here, both the nucleophile and the substrate participate in the rate-determining step.
The presence of the more electronegative halogen in the substrate creates a polarized carbon-halide bond. The halide pulls the electron cloud generating an electrophilic center at the carbon atom. Thus, the carbon atom carries a partial positive charge while the halide has a...
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The Pictet-Spengler Reaction Updates Its Habits.

Andrea Calcaterra1, Laura Mangiardi1,2, Giuliano Delle Monache1

  • 1Department of Chemistry and Technology of Drugs, "Department of Excellence 2018-2022", Sapienza University of Rome, Piazzale Aldo Moro 5, 00185 Rome, Italy.

Molecules (Basel, Switzerland)
|January 23, 2020
PubMed
Summary
This summary is machine-generated.

The Pictet-Spengler reaction remains a versatile synthetic tool, enabling efficient construction of complex molecules. Recent advancements (2011-2015) highlight its use in catalysis, tandem reactions, and enzymatic applications.

Keywords:
Pictet-SpenglerTHBCTHIQalkaloidcascade reactionmulticomponent reactionnatural productstetrahydro-β-carbolinetetrahydroisoquinolinetotal synthesis

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Medicinal Chemistry

Background:

  • The Pictet-Spengler reaction is a key method for synthesizing pharmacologically important scaffolds like tetrahydroisoquinolines.
  • Despite its long history, the reaction has seen significant innovation and application in recent years.

Purpose of the Study:

  • To review advancements and versatility of the Pictet-Spengler reaction between 2011 and 2015.
  • To highlight novel applications in complex molecule synthesis and medicinal chemistry.

Main Methods:

  • Review of literature focusing on Pictet-Spengler reaction applications from 2011-2015.
  • Analysis of its use in total synthesis, catalysis, tandem reactions, multicomponent reactions, and solid-phase synthesis.

Main Results:

  • The Pictet-Spengler reaction was applied in total synthesis of alkaloids and in generating compound libraries.
  • New tandem reactions and combinations with Ugi multicomponent reactions yielded complex polycyclic structures.
  • Enzymatic versions were developed for biosynthesis and biotransformations.

Conclusions:

  • The Pictet-Spengler reaction continues to be a highly adaptable and efficient synthetic strategy.
  • Its integration with modern synthetic techniques expands its utility in drug discovery and complex molecule synthesis.