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Types of Enols and Enolates01:19

Types of Enols and Enolates

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Aldehydes and ketones form enols, although only about 1% of the enol is present at the equilibrium for simple monocarbonyl compounds. The enol form is undetectable for acetaldehyde, present as only 1.5 × 10−4 % of acetone, and present as only 1.2% of cyclohexanone. Two kinds of regioisomeric enols are possible for unsymmetrical ketones, and their net composition is 1% at equilibrium. This instability is due to the lower bond energy of C=C than the C=O group. The additional...
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Aldehydes and Ketones with Amines: Enamine Formation Mechanism01:14

Aldehydes and Ketones with Amines: Enamine Formation Mechanism

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Enamine formation involves the addition of carbonyl compounds to a secondary amine through a series of reactions. The mechanism begins with the generation of carbinolamine, a nucleophilic attack followed by several proton transfer reactions. The hydroxyl group of the carbinolamine is converted into water to make a better leaving group that can push the reaction forward by eliminating a water molecule. In enamine formation, the last step involves the abstraction of a proton from the α carbon to...
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Dehydration of Aldols to Enones: Acid-Catalyzed Aldol Condensation

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As shown in Figure 1, under acidic conditions, the β-hydroxy ketone undergoes dehydration via an E1 elimination reaction to form an enone.
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Preparation of 1° Amines: Azide Synthesis01:22

Preparation of 1° Amines: Azide Synthesis

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Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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The nitrosation reaction is one of the methods of preparing 1,2-diketones. The enol tautomer of the starting ketone reacts with sodium nitrite in hydrochloric acid, generating the 1,2-diketone after hydrolysis.
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Reactivity of Enols01:18

Reactivity of Enols

3.3K
Enols are a class of compounds where a hydroxyl group is attached to a carbon–carbon double bond, which implies that it is a vinyl alcohol. A carbonyl compound with an α hydrogen undergoes keto–enol tautomerism and remains in equilibrium with its tautomer, the enol form. Usually, the keto tautomer is present in a higher concentration than the enol tautomer due to the higher bond energy of C=O compared to C=C. Moreover, the direction of the keto–enol equilibrium is...
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Preparation of Enantiopure Non-Activated Aziridines and Synthesis of Biemamide B, D, and epiallo-Isomuscarine
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Direct N-Me Aziridination of Enones.

Jawahar L Jat1, Ajay K Yadav1, Chandra Bhan Pandey2

  • 1Department of Chemistry, Babasaheb Bhimrao Ambedkar University (A Central University) Vidya Vihar, Raebareli Road, Lucknow 226025, Uttar Pradesh, India.

The Journal of Organic Chemistry
|February 16, 2022
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Summary

Researchers developed a new method for N-methyl aziridination of electron-deficient olefins using a copper catalyst and N-methyl-O-tosylhydroxylamine. This efficient, stereospecific reaction also yields N-H aziridinated products.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Aziridination is a crucial transformation in organic synthesis, enabling the formation of three-membered nitrogen-containing heterocycles.
  • Direct N-alkylation of olefins, particularly electron-deficient ones like enones, remains a synthetic challenge.
  • Previous methods for N-methyl aziridination of vinyl ketones were not established.

Purpose of the Study:

  • To develop the first direct general method for N-methyl aziridination of electron-deficient olefins.
  • To achieve efficient aziridination of vinyl ketones, a previously unknown transformation for both N-methyl and N-H aziridines.
  • To establish a simple, stereospecific, and additive-free reaction protocol.

Main Methods:

  • Utilized N-methyl-O-tosylhydroxylamine as the aminating agent.
  • Employed a copper(II) triflate (Cu(OTf)2) catalyst.
  • Conducted the reaction under open-flask conditions.

Main Results:

  • Successfully achieved the direct N-methyl aziridination of electron-deficient olefins and enones.
  • Demonstrated efficient aziridination of vinyl ketones, a novel reaction for both N-methyl and N-H aziridines.
  • The reaction proceeded with high stereospecificity and was operationally simple and additive-free.

Conclusions:

  • A novel and general method for N-methyl aziridination has been established.
  • The developed methodology provides efficient access to N-methyl and N-H aziridinated products, including vinyl ketones.
  • The reaction's simplicity, stereospecificity, and additive-free nature make it a valuable tool in synthetic organic chemistry.