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Amides to Amines: LiAlH4 Reduction01:20

Amides to Amines: LiAlH4 Reduction

5.0K
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.
5.0K
Preparation of Amines: Reduction of Amides and Nitriles01:13

Preparation of Amines: Reduction of Amides and Nitriles

2.5K
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,...
2.5K
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

3.6K
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...
3.6K
Preparation of Amines: Reductive Amination of Aldehydes and Ketones01:38

Preparation of Amines: Reductive Amination of Aldehydes and Ketones

2.9K
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.
2.9K
Preparation of Amines: Reduction of Oximes and Nitro Compounds01:29

Preparation of Amines: Reduction of Oximes and Nitro Compounds

3.8K
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,...
3.8K
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

2.2K
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
2.2K

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Bismuth-Catalyzed Amide Reduction.

Xiuxiu Yang1, Jennifer Kuziola1, Vanessa A Béland1

  • 1Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany.

Angewandte Chemie (International Ed. in English)
|June 7, 2023
PubMed
Summary
This summary is machine-generated.

A novel cationic bismuth complex efficiently converts amides into amines using silane. This catalytic system operates under mild conditions and tolerates various functional groups, offering a versatile method for amine synthesis.

Keywords:
AmidesBismuthKineticsReaction MechanismsReduction

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Organic Synthesis

Background:

  • Amide reduction is a fundamental transformation in organic chemistry.
  • Developing efficient and selective catalytic methods for amide reduction remains a key challenge.
  • Bismuth complexes have emerged as promising catalysts in various organic reactions.

Purpose of the Study:

  • To report a novel cationic bismuth complex for amide reduction.
  • To investigate the catalytic efficiency and substrate scope of the developed system.
  • To elucidate the reaction mechanism through kinetic studies.

Main Methods:

  • Catalytic reduction of amides using a cationic bismuth complex and silane as the hydride donor.
  • Screening of reaction conditions to optimize catalyst loading and temperature.
  • Analysis of substrate scope including various functional groups.
  • Kinetic studies to understand the reaction mechanism and identify rate-limiting steps.

Main Results:

  • The cationic bismuth complex effectively catalyzes amide reduction to amines.
  • The catalytic system operates under mild conditions with low catalyst loadings.
  • The reaction demonstrates broad functional group tolerance, including alkenes, esters, nitriles, furans, and thiophenes.
  • Kinetic studies revealed a reaction network with significant product inhibition.

Conclusions:

  • A new catalytic system for amide reduction using a cationic bismuth complex has been developed.
  • The method provides a mild, efficient, and functional-group-tolerant route to secondary and tertiary amines.
  • Understanding the reaction mechanism, including product inhibition, is crucial for further optimization.