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Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

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Carbonyl compounds and primary amines undergo reductive amination first to produce imines, followed by secondary amines in the same reaction mixture, using selective reducing agents like sodium cyanoborohydride or sodium triacetoxyborohydride. Reductive amination produces different degrees of substitution of amines depending on the starting amine substrate.
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Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

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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...
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

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Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
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Preparation of Amines: Reduction of Amides and Nitriles01:13

Preparation of Amines: Reduction of Amides and Nitriles

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Nitriles can be reduced to primary amines using reducing agents like lithium aluminum hydride or catalytic hydrogenation. The reduction introduces an amino group with an extra carbon in the skeleton. Nitriles are formed from the reaction between alkyl halides and sodium cyanide through the SN2 mechanism. Primary alkyl halides are the preferred substrates to prepare nitriles.
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
3.1K
Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

6.4K
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.
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Reductive amination catalyzed by iridium complexes using carbon monoxide as a reducing agent.

Alexey P Moskovets1, Dmitry L Usanov2, Oleg I Afanasyev1

  • 1A. N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, 119991, Vavilova St. 28, Moscow, Russian Federation. Chusov@ineos.ac.ru Denis.chusov@gmail.com.

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Researchers developed a new iridium-catalyzed method for synthesizing amines using carbon monoxide. This sustainable approach is compatible with sensitive functional groups, offering a valuable alternative to traditional reduction methods.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Sustainable Chemistry

Background:

  • Access to diverse amine structures is crucial in synthetic chemistry.
  • Traditional methods for amine synthesis often employ harsh reducing agents or catalysts incompatible with sensitive functional groups.

Purpose of the Study:

  • To develop a novel, sustainable catalytic methodology for amine synthesis.
  • To utilize a well-defined homogeneous iridium complex for amine construction.
  • To employ carbon monoxide as an effective reducing agent in catalysis.

Main Methods:

  • Systematic investigation of an iridium-catalyzed reaction.
  • Utilizing a homogeneous iridium complex as the catalyst.
  • Employing carbon monoxide (CO) as the reducing agent for amine synthesis.

Main Results:

  • Successful construction of a variety of amines.
  • Demonstrated compatibility with functional groups sensitive to reduction by hydrogen or complex hydrides.
  • Established a novel catalytic system for amine synthesis.

Conclusions:

  • The developed iridium-catalyzed methodology offers a sustainable and versatile route to amines.
  • This method provides an advantage over traditional reduction techniques due to its functional group tolerance.
  • The use of carbon monoxide as a reductant represents an important advancement in catalytic amine synthesis.