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ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

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All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

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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.
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Maxam-Gilbert Sequencing01:05

Maxam-Gilbert Sequencing

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In the same year as the discovery of the Sanger sequencing method, another group of scientists, Allan Maxam and Walter Gilbert, demonstrated their chemical-cleavage method for DNA sequencing. The Maxam-Gilbert method relies on using different chemicals that can cleave the DNA sequence at specific sites, the separation of resulting DNA fragments of variable size using electrophoresis, and deciphering the DNA sequence from the resulting gel bands.
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Oxidation of Phenols to Quinones

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In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
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Electrophilic 1,2- and 1,4-Addition of HX to 1,3-Butadiene01:17

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The electrophilic addition of hydrogen halides such as HBr to alkenes and nonconjugated dienes gives a single product as per Markovnikov’s rule.
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Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS
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Programmed Multiple C-H Bond Functionalization of the Privileged 4-hydroxyquinoline Template.

Quentin Ronzon1, Wei Zhang1, Nicolas Casaretto2

  • 1Laboratoire de Synthèse Organique, Ecole Polytechnique, ENSTA, CNRS, Institut Polytechnique de Paris, 91128, Palaiseau Cedex, France.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 13, 2021
PubMed
Summary

This study demonstrates iterative, site-selective C-H functionalization of 4-hydroxyquinoline to create diverse chemical libraries. This method efficiently generates novel compounds with significant antimalarial potential.

Keywords:
Antimalarial drugsCompound libraryC−H bond functionalizationDirecting groupsDivergent synthesis

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Area of Science:

  • Medicinal Chemistry
  • Organic Synthesis

Background:

  • Directed C-H functionalization enables substituent introduction on heterocyclic scaffolds.
  • Iterative functionalization for library generation is less explored.

Purpose of the Study:

  • To report multiple, site-selective, metal-catalyzed C-H functionalization of a programmed 4-hydroxyquinoline scaffold.
  • To generate chemical diversity in a biologically relevant library.

Main Methods:

  • Utilized N-oxide and O-carbamoyl protection for directed C-H functionalization at C-2, C-8, and C-3.
  • Employed a Fries rearrangement and subsequent functionalization at C-5 using the quinolone carbonyl group.

Main Results:

  • Successfully functionalized four distinct positions (C-2, C-3, C-5, C-8) on the 4-hydroxyquinoline scaffold.
  • Demonstrated the generation of a diverse chemical library through iterative C-H functionalization.
  • Identified significant antimalarial potential within the synthesized library.

Conclusions:

  • Multiple C-H functionalization is a powerful strategy for creating diverse, medicinally relevant chemical libraries.
  • The developed method offers efficient access to complex 4-hydroxyquinoline derivatives.