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Multigram Synthesis of 3,3-Spiro-α-prolines.

Nikita O Derkach¹, Kostiantyn V Levchenko^1,2, Ievgenii A Iermolenko^1,3

¹Enamine Ltd., 78 Winston Churchill Street, 02094 Kyiv, Ukraine.

The Journal of Organic Chemistry

|December 10, 2024

Summary

Researchers developed efficient synthetic routes for novel spirocyclic α-proline building blocks. These practical methods use readily available starting materials and are suitable for multigram production of valuable proline and pyroglutamic acid derivatives.

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Area of Science:

Organic Chemistry
Medicinal Chemistry
Synthetic Chemistry

Background:

Spirocyclic compounds are important scaffolds in medicinal chemistry.
Developing efficient synthetic routes to novel proline derivatives is crucial for drug discovery.
Existing methods for spirocyclic proline synthesis can be complex or low-yielding.

Purpose of the Study:

To develop novel, practical, and scalable synthetic methodologies for spirocyclic α-proline building blocks.
To explore the utility of these methods for synthesizing spirocyclic pyroglutamic acids.
To provide efficient access to unique chemical entities for further research.

Main Methods:

Two distinct synthetic routes were employed, utilizing cyclic ketones and esters as starting materials.
The methodologies involved standard organic chemistry transformations.
Both routes were optimized for efficiency and scalability, comprising 6 and 7 steps respectively.

Main Results:

A series of novel spirocyclic α-proline building blocks were successfully synthesized.
The synthetic approaches proved to be convenient, practical, and scalable for multigram production.
The developed methodologies were also applicable to the synthesis of spirocyclic pyroglutamic acids.

Conclusions:

The study presents efficient and versatile synthetic strategies for accessing spirocyclic proline and pyroglutamic acid derivatives.
These novel building blocks can be valuable for medicinal chemistry and drug discovery programs.
The practical nature of the methods facilitates their application in various research settings.