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Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

4.4K
Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively.
Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
4.4K
Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

2.6K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
2.6K
Acid Halides to Ketones: Gilman Reagent01:14

Acid Halides to Ketones: Gilman Reagent

2.7K
Lithium dialkyl cuprate, also known as Gilman reagents, selectively reduces acid halides to ketones. The acid chloride is treated with Gilman reagent at −78 °C in the presence of ether solution to produce a ketone in good yield.
As shown below, the mechanism proceeds in two steps. First, one of the alkyl groups of the reagent acts as a nucleophile and attacks the acyl carbon of the acid chloride to form a tetrahedral intermediate. This is followed by the reformation of the...
2.7K
Acid Halides to Alcohols: Grignard Reaction01:15

Acid Halides to Alcohols: Grignard Reaction

2.0K
Organomagnesium halides, commonly known as Grignard reagents, convert acid halides to tertiary alcohols. The reaction requires two equivalents of the Grignard reagent and proceeds via a ketone intermediate.
Grignard reagents are a source of carbanions and function as nucleophiles. The mechanism begins with the nucleophilic attack by the carbanion at the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs,...
2.0K
Preparation of 1° Amines: Gabriel Synthesis01:28

Preparation of 1° Amines: Gabriel Synthesis

3.4K
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...
3.4K
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

3.1K
Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
3.1K

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Updated: May 8, 2025

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of &#945;-Imino &#947;-Lactones and Alkylidene Pyrazolones
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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

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Phthalimidine Synthesis via Iridium-Catalyzed Reductive Lactamization.

Jingyu Zhang1, Yang Chen1, Jiaxi Xu1

  • 1Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China.

The Journal of Organic Chemistry
|December 24, 2024
PubMed
Summary

This study introduces a sustainable iridium-catalyzed method for synthesizing diverse phthalimidines from 2-formylbenzoic acid and amines. The efficient process uses eco-friendly solvents and shows potential for pharmaceutical applications.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Medicinal Chemistry

Background:

  • Phthalimidines are important heterocyclic compounds with diverse biological activities.
  • Developing efficient and sustainable synthetic routes for phthalimidines is crucial for drug discovery and development.

Purpose of the Study:

  • To develop a novel, sustainable, and efficient iridium-catalyzed method for synthesizing structurally diverse phthalimidines.
  • To demonstrate the practical applicability of the developed method for late-stage functionalization of medicinally relevant molecules.

Main Methods:

  • The synthesis utilizes 2-formylbenzoic acid and primary amines as starting materials.
  • An iridium-catalyzed reductive lactamization strategy is employed.
  • Water-ethanol mixtures are used as the reaction solvent.

Main Results:

  • Structurally diverse phthalimidines were synthesized with high efficiency (S/C up to 10000).
  • The method demonstrates broad substrate scope, good scalability, and easy purification.
  • The reaction is suggested to involve iridium hydride formation in the rate-limiting step.

Conclusions:

  • The reported iridium-catalyzed reductive lactamization offers a practical and sustainable approach to phthalimidines.
  • The method's efficiency and applicability make it valuable for synthesizing pharmaceutical intermediates and functionalizing drug molecules.