A1 Journal article (refereed)
Amidino substituted 2-aminophenols : biologically important building blocks for the amidino-functionalization of 2-substituted benzoxazoles (2021)

Ptiček, L., Hok, L., Grbčić, P., Topić, F., Cetina, M., Rissanen, K., Kraljević Pavelić, S., & Vianello, R. (2021). Amidino substituted 2-aminophenols : biologically important building blocks for the amidino-functionalization of 2-substituted benzoxazoles. Organic and Biomolecular Chemistry, 19(12), 2784-2793. https://doi.org/10.1039/D1OB00235J

JYU authors or editors

Publication details

All authors or editors: Ptiček, Lucija; Hok, Lucija; Grbčić, Petra; Topić, Filip; Cetina, Mario; Rissanen, Kari; Kraljević Pavelić, Sandra; Vianello, Robert

Journal or series: Organic and Biomolecular Chemistry

ISSN: 1477-0520

eISSN: 1477-0539

Publication year: 2021

Volume: 19

Issue number: 12

Pages range: 2784-2793

Publisher: Royal Society of Chemistry

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1039/D1OB00235J

Publication open access: Not open

Publication channel open access:


Unlike the closely related and widely investigated amidino-substituted benzimidazoles and benzothiazoles with a range of demonstrated biological activities, the matching benzoxazole analogues still remain a largely understudied and not systematically evaluated class of compounds. To address this challenge, we utilized the Pinner reaction to convert isomeric cyano-substituted 2-aminophenols into their amidine derivatives, which were isolated as hydrochlorides and/or zwitterions, and whose structure was confirmed by single crystal X-ray diffraction. The key step during the Pinner synthesis of the crucial carboximidate intermediates was characterized through mechanistic DFT calculations, with the obtained kinetic and thermodynamic parameters indicating full agreement with the experimental observations. The obtained amidines were subjected to a condensation reaction with aryl carboxylic acids that allowed the synthesis of a new library of 5- and 6-amidino substituted 2-arylbenzoxazoles. Their antiproliferative features against four human tumour cell lines (SW620, HepG2, CFPAC-1, HeLa) revealed sub-micromolar activities on SW620 for several cyclic amidino 2-naphthyl benzoxazoles, thus demonstrating the usefulness of the proposed synthetic strategy and promoting amidino substituted 2-aminophenols as important building blocks towards biologically active systems.

Keywords: organic compounds; nitrogen compounds; phenols; chemical synthesis

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2021

Preliminary JUFO rating: 1

Last updated on 2021-07-07 at 17:56