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Synthesis of α-Substituted Carbonyl Compounds: The Stork Enamine Reaction01:26

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α-Substituted ketones or aldehydes can be synthesized from enamines by the Stork enamine reaction, named after its pioneer Gilbert Stork. Enamines are useful synthetic intermediates where the lone pair on nitrogen is in conjugation with the C=C bond. They resemble enolate ions, as the resonance forms of both species have a nucleophilic α carbon.
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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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Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview01:16

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Primary amines react with carbonyl compounds—aldehydes and ketones—to generate imines. Imines consist of a C=N double bond and are named Schiff bases after its discoverer—the German chemist Hugo Schiff. On the other hand, secondary amines react with carbonyl compounds to give enamines. In enamines, the presence of a C=C double bond adjacent to the nitrogen atom leads to the delocalization of the lone pair.
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Reactivity of Enols01:18

Reactivity of Enols

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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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Amines to Alkenes: Hofmann Elimination01:16

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Alkenes can be obtained from amines via an E2 elimination. The amine is first converted into a good leaving group, such as a quaternary ammonium salt. This is accomplished by treating the amine with an excess of alkyl halide, which results in a halide salt. Next, the halide salt is transformed into a hydroxide salt that functions as a base to enable elimination.
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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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Intermolecular Enamine Mizoroki-Heck Reactions on a Bio-Derived Scaffold.

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Researchers explored the intermolecular Mizoroki-Heck reaction using enamines derived from Cyrene. Optimized conditions yielded efficient arylation, predominantly at the C-N bond, offering a new route to nitrogen-containing heterocycles.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Heterocyclic Chemistry

Background:

  • The intramolecular enamine-Mizoroki-Heck reaction is established for synthesizing nitrogen-containing heterocycles.
  • The intermolecular variant remains less explored, presenting an opportunity for synthetic methodology development.

Purpose of the Study:

  • To investigate the intermolecular Mizoroki-Heck reaction of enamines derived from Cyrene.
  • To optimize reaction conditions for efficient arylation of enamines.
  • To explore the regioselectivity and diastereoselectivity of the reaction.

Main Methods:

  • Enamines were synthesized from Cyrene.
  • Mizoroki-Heck reaction conditions were screened and optimized.
  • Palladium(II) bis(dibenzylideneacetone) (Pd(dba)2) and tricyclohexylphosphine (PCy3) were used as catalysts.
  • Reactions were performed in xylene at reflux temperature.

Main Results:

  • An optimized condition using 1.5 mol % Pd(dba)2 with PCy3 in xylene at reflux yielded the highest product yield.
  • Arylation occurred predominantly at the C-N center of the enamine.
  • Diastereoselectivity was found to be dependent on the nitrogen substitution within the enamine.

Conclusions:

  • The study successfully established an intermolecular Mizoroki-Heck reaction for enamines derived from Cyrene.
  • Optimized conditions enable efficient arylation, primarily at the C-N bond.
  • The findings provide a valuable method for constructing nitrogen-containing heterocycles with tunable stereochemistry.