Synthesis 2020; 52(23): 3622-3631
DOI: 10.1055/s-0040-1707228
paper
© Georg Thieme Verlag Stuttgart · New York

A PASE Approach to the Synthesis of Benzimidazopurines as Polycondensed Purine Derivatives

a   Department of Organic and Biomolecular Chemistry, Ural Federal University, Mira St. 19, 620002 Ekaterinburg, Russian Federation   Email: vicww4@gmail.com
,
Evgeny N. Ulomsky
a   Department of Organic and Biomolecular Chemistry, Ural Federal University, Mira St. 19, 620002 Ekaterinburg, Russian Federation   Email: vicww4@gmail.com
,
Konstantin V. Savateev
a   Department of Organic and Biomolecular Chemistry, Ural Federal University, Mira St. 19, 620002 Ekaterinburg, Russian Federation   Email: vicww4@gmail.com
,
Evgeny M. Mukhin
a   Department of Organic and Biomolecular Chemistry, Ural Federal University, Mira St. 19, 620002 Ekaterinburg, Russian Federation   Email: vicww4@gmail.com
,
Denis A. Gazizov
b   Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskoi/20 Akademicheskaya St. 620990 Ekaterinburg, Russian Federation
,
Evgeny B. Gorbunov
b   Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskoi/20 Akademicheskaya St. 620990 Ekaterinburg, Russian Federation
,
Vladimir L. Rusinov
a   Department of Organic and Biomolecular Chemistry, Ural Federal University, Mira St. 19, 620002 Ekaterinburg, Russian Federation   Email: vicww4@gmail.com
b   Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskoi/20 Akademicheskaya St. 620990 Ekaterinburg, Russian Federation
› Author Affiliations
The reported study was funded by Russian Foundation for Basic Research (RFBR), project number 19-33-90161.
Further Information

Publication History

Received: 16 June 2020

Accepted after revision: 01 July 2020

Publication Date:
06 August 2020 (online)


Abstract

A highly efficient PASE approach to a new class of polycyclic purine derivatives has been proposed. The strategy includes a consecutive reduction, auto-aromatization, and heterocyclization of the initial nitrobenzimidazopyrimidines obtained by a three-component condensation. It was shown that reduction of nitrobenzimidazopyrimidines by metals in acidic media was more efficient than heterogeneous hydro­genation. Novel derivatives of benz[4,5]imidazo[1,2-a]purines were obtained­ in good yields and the proposed structure was confirmed by X-ray crystal structure analysis. The obtained convergent benzimidazopurines combine two relevant medicinal chemistry scaffolds – benz­imidazole and purine.

Supporting Information