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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.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
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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.
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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Multicomponent Reductive Coupling for Selective Access to Functional γ-Lactams by a Single-Atom Cobalt Catalyst.

Jia-Lu Sun1, Huanfeng Jiang1, Pierre H Dixneuf2

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Summary
This summary is machine-generated.

A new catalytic method efficiently synthesizes α-hydroxy-γ-lactams using a cobalt-based catalyst. This approach simplifies the process, uses readily available starting materials, and demonstrates broad applicability for various compounds.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Materials Science

Background:

  • α-hydroxy-γ-lactams are crucial building blocks in various chemical fields.
  • Existing synthesis methods for these compounds are often complex and lack diversity.
  • Difficulties in synthesis hinder their widespread practical application.

Purpose of the Study:

  • To develop a general and efficient method for the direct synthesis of α-hydroxy-γ-lactams.
  • To design and utilize a novel multifunctional catalyst for this transformation.
  • To explore a new reaction pathway involving reduction interruption.

Main Methods:

  • Design and synthesis of a nitrogen and TiO2 co-doped graphitic carbon-supported material with atomically dispersed cobalt sites (CoSA-N/NC-TiO2).
  • Application of the catalyst for the direct construction of α-hydroxy-γ-lactams from nitro(hetero)arenes, aldehydes, water, and alkynoates.
  • Mechanistic studies to elucidate the reaction pathway and the role of the catalyst.

Main Results:

  • A general method for α-hydroxy-γ-lactam synthesis was established with operational simplicity.
  • The method demonstrated broad substrate compatibility, yielding over 100 examples.
  • High step and atom efficiency, good selectivity, and excellent catalyst reusability were achieved.
  • Mechanistic studies revealed synergistic effects between CoN4 active sites and dopants, leading to key intermediates.

Conclusions:

  • The developed catalytic system offers a practical and efficient route to α-hydroxy-γ-lactams.
  • The concept of reduction interruption provides a new reaction strategy for organic synthesis.
  • Rational catalyst design is key to unlocking novel and useful chemical transformations.