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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.3K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

2.7K
Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
2.7K
Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

9.5K
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...
9.5K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

4.1K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
4.1K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.5K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.5K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.9K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.9K

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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of &#945;-Imino &#947;-Lactones and Alkylidene Pyrazolones
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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

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Macrocyclization via C-H functionalization: a new paradigm in macrocycle synthesis.

Saumitra Sengupta1, Goverdhan Mehta1

  • 1School of Chemistry, University of Hyderabad, Gachibowli, Hyderabad-5000 046, Telengana, India. jusaumitra@yahoo.co.uk gmehta43@gmail.com gmsc@uohyd.ernet.in.

Organic & Biomolecular Chemistry
|February 27, 2020
PubMed
Summary
This summary is machine-generated.

New C-H activation strategies enable efficient synthesis of complex macrocycles for drug discovery. These methods offer robust, diverse, and economical routes to novel therapeutic agents targeting challenging diseases.

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Area of Science:

  • Organic Chemistry
  • Medicinal Chemistry
  • Chemical Biology

Background:

  • Macrocycles are crucial for targeting challenging therapeutic areas like protein-protein interactions and GPCRs.
  • Developing efficient and versatile de novo macrocyclization strategies is essential for drug discovery.
  • Existing methods often lack the robustness or diversity needed for complex molecular architectures.

Purpose of the Study:

  • To review recent advancements in C-H activation-based macrocyclization strategies.
  • To highlight the application of these methods in synthesizing complex peptides and bioactive molecules.
  • To foster interest in novel macrocycle construction for organic synthesis and chemical biology.

Main Methods:

  • Review of literature focusing on C-H activation logic for macrocyclization.
  • Analysis of methodologies enabling access to diverse macrocycle sizes and topologies.
  • Examination of applications in natural product and drug-like molecule synthesis.

Main Results:

  • C-H activation offers a powerful paradigm for macrocyclization, particularly for complex peptides.
  • These strategies provide high atom and step economy.
  • Successful synthesis of various macrocyclic structures with diverse applications has been achieved.

Conclusions:

  • C-H activation-based macrocyclization represents a significant advancement in synthetic chemistry.
  • These methods facilitate efficient and diverse access to macrocycles for therapeutic applications.
  • Further exploration of these techniques will drive innovation in drug discovery and chemical biology.