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Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

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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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Preparation of Alkynes: Alkylation Reaction02:27

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Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
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Preparation of Alcohols via Substitution Reactions01:38

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Overview
Alcohols can be synthesized from alkyl halides via nucleophilic substitution reactions. The highly polar carbon-halogen bond in the substrate makes halide a good leaving group.  The hydroxide ion or water can act as a nucleophile to take the place of halide and form an alcohol. The substitution reactions occur via two different reaction pathways, SN1 or SN2,  depending on the nature of carbon attached to the halide.
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Preparation of Alkynes: Dehydrohalogenation02:34

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Introduction
Alkynes can be prepared by dehydrohalogenation of vicinal or geminal dihalides in the presence of a strong base like sodium amide in liquid ammonia. The reaction proceeds with the loss of two equivalents of hydrogen halide (HX) via two successive E2 elimination reactions.
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Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration02:40

Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration

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Introduction
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.       
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Aldol Condensation with β-Diesters: Knoevenagel Condensation01:27

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The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.
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Updated: Aug 12, 2025

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Computer-aided key step generation in alkaloid total synthesis.

Yingfu Lin1, Rui Zhang2, Di Wang1

  • 1Department of Medicinal Chemistry, University of Michigan, Ann Arbor, MI 48109, USA.

Science (New York, N.Y.)
|February 2, 2023
PubMed
Summary
This summary is machine-generated.

Computer-aided synthesis planning and molecular graph editing were used to shorten chemical synthesis routes for alkaloids. This approach enabled a highly efficient three-step synthesis of (-)-stemoamide, a complex alkaloid.

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Area of Science:

  • Computational Chemistry
  • Organic Synthesis
  • Medicinal Chemistry

Background:

  • Efficient chemical synthesis is essential for producing medicines, materials, and agrochemicals.
  • Automating retrosynthetic analysis has been a long-standing challenge due to the vast number of possible synthetic routes.
  • Recent advancements in computing power and algorithms are beginning to address this complexity.

Purpose of the Study:

  • To develop a computational strategy for minimizing the number of synthetic steps in alkaloid production.
  • To merge computer-aided synthesis planning with molecular graph editing techniques.
  • To identify high-impact key steps in retrosynthesis using graph edit distances.

Main Methods:

  • Exploration of a computational strategy combining computer-aided synthesis planning and molecular graph editing.
  • Application of graph edit distances to identify critical steps in computer-generated retrosynthesis plans.
  • Development of an enantioselective three-step synthesis for (-)-stemoamide.

Main Results:

  • A novel computational approach was developed to streamline retrosynthetic analysis.
  • The strategy successfully minimized the number of synthetic steps required for complex alkaloid synthesis.
  • An efficient, enantioselective three-step synthesis of (-)-stemoamide was achieved.

Conclusions:

  • The integration of computer-aided synthesis planning and molecular graph editing offers a powerful strategy for optimizing synthetic routes.
  • This computational approach can effectively identify high-impact steps, leading to significantly shorter and more efficient syntheses.
  • The successful synthesis of (-)-stemoamide demonstrates the practical utility of this method in complex molecule synthesis.