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Preparation of Nitriles01:12

Preparation of Nitriles

2.0K
One of the common methods to prepare nitriles is the dehydration of amides. This method requires strong dehydrating agents like phosphorous pentoxide or boiling acetic anhydride for converting amides to nitriles. Another reagent namely, thionyl chloride also accomplishes the dehydration of amides, where amide acts as a nucleophile. The first step of the mechanism involves the nucleophilic attack by the amide on the thionyl chloride to form an intermediate. In the next step, the electron pairs...
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Preparation of 1° Amines: Gabriel Synthesis01:28

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Direct alkylation is not a suitable method for synthesizing amines because it produces polyalkylated products. Gabriel synthesis is the most preferred method to exclusively make primary amines. The method uses phthalimide, which contains a protected form of nitrogen that participates in alkylation only once to predominantly give primary amines.
Strong bases like NaOH or KOH deprotonate the phthalimide to form the corresponding anion, which acts as a nucleophile. Further, the anion attacks an...
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SN2 Reaction: Stereochemistry02:23

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In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
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Alkylation of β-Diester Enolates: Malonic Ester Synthesis01:14

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SN1 Reaction: Stereochemistry02:15

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8.3K
This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

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4.0K
Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Efficient Method of (S)-Nicotine Synthesis.

Nazar Trotsko1, Barbara Miroslaw2, Radomir Jasiński3

  • 1Department of Organic Chemistry, Medical University of Lublin, Witolda Chodźki 4A, 20-093 Lublin, Poland.

Molecules (Basel, Switzerland)
|December 17, 2024
PubMed
Summary
This summary is machine-generated.

This study presents an efficient four-step synthesis for producing pure (S)-nicotine, a synthetic alternative free from nitrosamine contamination. The method involves myosmine reduction and enantiomeric separation, offering a cost-effective industrial-scale production route.

Keywords:
(S)-nicotine(S)-nornicotinedrug manufacturingenantiomeric separationnew synthetic routes for drug candidates

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry
  • Pharmaceutical Chemistry

Background:

  • Synthetic nicotine offers a nitrosamine-free alternative to natural nicotine.
  • Existing synthesis methods require improvement for industrial applications.

Purpose of the Study:

  • To develop an efficient, cost-effective four-step synthesis for (S)-nicotine.
  • To achieve high yield and enantiomeric purity of synthetic (S)-nicotine.
  • To enable industrial-scale production of pure synthetic nicotine.

Main Methods:

  • Four-step synthesis involving myosmine reduction (electrochemical and chemical).
  • Enantiomeric separation of nornicotine via diastereomeric salt formation with N-lauroyl-(R)-alanine.
  • Methylation of (S)-nornicotine.
  • Structure elucidation using X-ray diffraction (XRD).

Main Results:

  • Achieved up to 90% yield of pure nornicotine.
  • Isolated (S)-nornicotine with 92% enantiomeric excess (ee).
  • XRD analysis provided insights into enantiodiscrimination mechanisms.

Conclusions:

  • The developed methodology enables efficient and cost-effective production of (S)-nicotine.
  • The synthesis is suitable for industrial-scale applications.
  • The process allows for efficient regeneration of reagents and solvents.