Synthesis 2025; 57(03): 664-674
DOI: 10.1055/a-2413-6896
paper

Practical Multigram Approach to Conformationally Constrained α-Proline-Based Building Blocks with γ-Spiro Conjunction

Ievgenii A. Iermolenko
a   Enamine Ltd., 78 Winston Churchill str., 02094 Kyiv, Ukraine
c   Institute of Organic Chemistry of the National Academy of Sciences of Ukraine, 5 Akademik Kukhar str., 02094 Kyiv, Ukraine
,
Oleksii S. Kolosov
a   Enamine Ltd., 78 Winston Churchill str., 02094 Kyiv, Ukraine
,
Eugeniy N. Ostapchuk
a   Enamine Ltd., 78 Winston Churchill str., 02094 Kyiv, Ukraine
b   Taras Shevchenko National University of Kyiv, 60 Volodymyrska str., 01033 Kyiv, Ukraine
,
Dmitry A. Lega
a   Enamine Ltd., 78 Winston Churchill str., 02094 Kyiv, Ukraine
b   Taras Shevchenko National University of Kyiv, 60 Volodymyrska str., 01033 Kyiv, Ukraine
,
Nikita O. Derkach
a   Enamine Ltd., 78 Winston Churchill str., 02094 Kyiv, Ukraine
,
a   Enamine Ltd., 78 Winston Churchill str., 02094 Kyiv, Ukraine
,
Valeriya G. Makhankova
a   Enamine Ltd., 78 Winston Churchill str., 02094 Kyiv, Ukraine
b   Taras Shevchenko National University of Kyiv, 60 Volodymyrska str., 01033 Kyiv, Ukraine
,
Alexandr B. Rozhenko
b   Taras Shevchenko National University of Kyiv, 60 Volodymyrska str., 01033 Kyiv, Ukraine
c   Institute of Organic Chemistry of the National Academy of Sciences of Ukraine, 5 Akademik Kukhar str., 02094 Kyiv, Ukraine
,
Dmytro M. Volochnyuk
a   Enamine Ltd., 78 Winston Churchill str., 02094 Kyiv, Ukraine
b   Taras Shevchenko National University of Kyiv, 60 Volodymyrska str., 01033 Kyiv, Ukraine
c   Institute of Organic Chemistry of the National Academy of Sciences of Ukraine, 5 Akademik Kukhar str., 02094 Kyiv, Ukraine
,
a   Enamine Ltd., 78 Winston Churchill str., 02094 Kyiv, Ukraine
b   Taras Shevchenko National University of Kyiv, 60 Volodymyrska str., 01033 Kyiv, Ukraine
c   Institute of Organic Chemistry of the National Academy of Sciences of Ukraine, 5 Akademik Kukhar str., 02094 Kyiv, Ukraine
› Author Affiliations
The research was funded by internal Enamine grant, the Ministry of Education and Science of Ukraine (grant number 0123U102102), and the National Academy of Sciences of Ukraine (grant number 0120U104905).


Dedicated to all the brave defenders of Ukraine, whose sacrifice made this publication possible.

Abstract

Unusual amino acids have arisen as an indispensable instrument at the disposal of modern medicinal chemistry. While extensively exploited as building blocks in the search for new pharmaceuticals, their application goes far beyond. They are currently involved in explorations of the structure and conformational mobility of peptides, modification and amplification of peptidomimetic activity, and others. Herein, we report an effective synthetic approach to nonplanar, conformationally restricted, sp3-enriched spirocyclic α-prolines. The protocol employs readily available nitrile-based starting materials and conventional experimental procedures. The synthetic sequence is concise and includes three principal stages (one of them a four-step telescopic process). The reactions proceed on a multigram scale affording the target prolines in overall good yields. The possibility of chiral separation of the synthesized racemic spiro prolines to both pure enantiomers is shown. The building blocks synthesized in the study are expected to have practical uses in the field of medicinal chemistry.

Supporting Information



Publication History

Received: 06 May 2024

Accepted after revision: 11 September 2024

Accepted Manuscript online:
11 September 2024

Article published online:
10 October 2024

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