Synthesis 2022; 54(24): 5471-5478
DOI: 10.1055/a-1911-6793
paper

Organocatalytic Synthesis of Benzimidazole Derivatives

Authors

  • Leticia Lafuente

    a   Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Roque Sáenz Peña 352, Bernal, 1876, Buenos Aires, Argentina
  • Lautaro G. Maidana

    a   Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Roque Sáenz Peña 352, Bernal, 1876, Buenos Aires, Argentina
  • Juan A. Bisceglia

    b   Departamento de Ciencias Aplicadas y Tecnología, Universidad Nacional de Moreno, Av. Bartolomé Mitre 1891, Moreno, 1744, Buenos Aires, Argentina
  • Adolfo M. Iribarren

    a   Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Roque Sáenz Peña 352, Bernal, 1876, Buenos Aires, Argentina
  • Elizabeth S. Lewkowicz

    a   Departamento de Ciencia y Tecnología, Universidad Nacional de Quilmes, Roque Sáenz Peña 352, Bernal, 1876, Buenos Aires, Argentina

This study was supported by grants from Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT) (PICT 2016 0861) and Universidad Nacional de Quilmes (UNQ).


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Abstract

A synthetic route for the production of chiral derivatives of benzimidazole is presented. Different commercially available amines are evaluated as organocatalysts for the stereoselective aldol addition of N1-benzimidazolyl acetaldehyde, previously prepared by N-alkylation of benzimidazole, with cyclic ketones. When cyclohexanone was used, l-prolinamide proved to be the most efficient catalyst, giving (S)-2-((R)-2-(1H-benzo[d]imidazol-1-yl)-1-hydroxyethyl)cyclohexanone in 92% yield, 90% ee and 92:8 dr (anti/syn).

Supporting Information



Publikationsverlauf

Eingereicht: 31. Mai 2022

Angenommen nach Revision: 28. Juli 2022

Accepted Manuscript online:
28. Juli 2022

Artikel online veröffentlicht:
15. September 2022

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