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Preparation of 1° Amines: Azide Synthesis01:22

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Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
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The aldol reaction of a ketone under acidic conditions successfully forms an unsaturated carbonyl as the final product instead of an aldol. The acid-catalyzed aldol reaction is depicted in Figure 1.
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The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the...
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By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
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Iron-Catalyzed Asymmetric Decarboxylative Azidation.

Kaikai Wang1,2, Yajun Li2, Xiaoyan Li2,3

  • 1Fujian Key Laboratory of Innate Immune Biology, Biomedical Research Center of South China, Key Laboratory of OptoElectronic Science and Technology for Medicine of Ministry of Education, College of Life Sciences, Fujian Normal University, Fuzhou 350007, People's Republic of China.

Organic Letters
|November 10, 2021
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Researchers developed the first iron-catalyzed asymmetric azidation of benzylic peresters using trimethylsilyl azide. This method enables enantioselective azidation of hydrocarbon radicals under mild conditions, yielding valuable chiral azides.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Methodology

Background:

  • Asymmetric synthesis is crucial for producing enantiomerically pure compounds.
  • Azidation reactions are important for introducing nitrogen functionalities into organic molecules.
  • Developing catalytic methods for asymmetric azidation remains a significant challenge.

Purpose of the Study:

  • To report the first iron-catalyzed asymmetric azidation of benzylic peresters.
  • To demonstrate the enantioselective azidation of hydrocarbon radicals lacking strong interactions.
  • To showcase the synthetic utility of the resulting chiral benzylic azides.

Main Methods:

  • Utilized an iron catalyst for asymmetric azidation.
  • Employed trimethylsilyl azide (TMSN3) as the azido source.
  • Investigated the reaction scope with various benzylic peresters.

Main Results:

  • Achieved the first iron-catalyzed asymmetric azidation of benzylic peresters.
  • Successfully azidated hydrocarbon radicals with high enantioselectivity.
  • Obtained good to excellent yields with broad functional group tolerance under mild conditions.

Conclusions:

  • The developed method provides an efficient route to chiral benzylic azides.
  • The resulting chiral azides are versatile intermediates for further transformations.
  • This reaction expands the toolbox for asymmetric synthesis and radical functionalization.