Methodologies in Amine Synthesis

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Provides a unique overview of efficient synthetic routes to one of the most important compound classes in organic and pharmaceutical chemistry! Amines are among the most important compounds in organic chemistry due to their wide occurrence in natural products, drugs, crop protection compounds, and advanced materials. For example, the majority of drugs are amines or contain functional groups derived from amines. Powerful and efficient methods for the introduction of the amino group are therefore of great importance to synthetic chemists in academia and industry.
Methodologies in Amine Synthesis: Challenges and Applications Only up-to-date and comprehensive book on the preparation of amines ? one of the most frequently occurring compound classes found in natural products, bioactive molecules, and advanced materials. Presents efficient and useful synthetic methods, highlights opportunities / challenges as well as applications in pharmaceutical chemistry and materials science. Chapters are compiled by well-known experts in the field. One of them edited the previous books
(2001) and
(2007). The book
is a musthave for chemists in academia and industry working in the field of organic synthesis and catalysis, natural product chemistry, drug synthesis and pharmaceutical chemistry, as well as materials science.

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Scheme 136 TMfree Rubottom oxidation Scheme 137 TMfree NHaziridination - фото 37

Scheme 1.36 TM‐free Rubottom oxidation.

Scheme 137 TMfree NHaziridination of unactivated olefins Source Modified - фото 38

Scheme 1.37 TM‐free NH‐aziridination of unactivated olefins.

Source: Modified from Cheng et al. [53].

Two sets of conditions for the synthesis of primary α‐aminoketones from silyl enol ethers were developed. Electron‐rich substrates can be α‐aminated without transition metal catalysis, while substrates bearing electron‐withdrawing substituents can undergo α‐amination with the help of Rh or Cu catalysts.

Further studies in the Kürti group have shown that it is possible to achieve TM‐free NH‐aziridination of unactivated olefins with highly reactive NH‐oxaziridines via the “Butterfly Mechanism” [53]. These unique NH‐oxaziridines bear one or more strongly electron‐withdrawing group(s), which greatly enhance the electrophilicity of the nitrogen atom. With the further enhancement provided via the hydrogen bonding interactions by the HFIP solvent molecules, these highly reactive intermediates are capable of TM‐free transfer of the NH onto the unactivated olefins ( Scheme 1.37).

However, because of their high reactivities, these highly electron‐deficient NH‐oxaziridines cannot be isolated. The Kürti group solved this issue by forming these intermediates in situ from HOSA and ketones bearing electron‐withdrawing groups. Mass spectrometric studies confirmed the existence of the highly reactive oxaziridine intermediates.

By using a chiral nonracemic ketone as the organocatalyst, the reaction can give enantiomerically enriched products.

1.6 Conclusion

In the past two decades, a number of C—N bond‐forming reactions have been developed that take advantage of hydroxylamine‐based electrophilic aminating agents as sources of nitrogen. A great deal of structural diversity has been achieved in terms of the products. Olefins, substituted aromatic systems, as well as organometallic compounds have been successfully aminated. Although the vast majority of reported methods utilize transition metal complexes as catalysts, metal‐free and even organocatalytic methods have also emerged during the past decade. The two emerging trends are to incorporate unprotected amino groups directly and to use inexpensive and nontoxic transition metal catalysts such as iron complexes. We are confident that during the next decade, we will see further innovation in electrophilic amination chemistries.

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