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Issue 28, 2018
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Versatile coordination of acetazolamide to ruthenium(ii) p-cymene complexes and preliminary cytotoxicity studies

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Abstract

The carbonic anhydrase inhibitor acetazolamide (AcmH2) reacted with [(η6-p-cymene)RuCl(μ-Cl)]2 to afford [(η6-p-cymene)RuCl2N-AcmH2)], 1A, in near-quantitative yield. In methanol, 1A exists in equilibrium with 1B, being probably a coordination isomer, as established by VT 1H-EXSY NMR spectroscopy. DFT calculations pointed to a higher stability of 1A with respect to 1B. [(η6-p-cymene)RuCl(κ2N,N′-AcmH)], 2, was obtained in 86% yield from [(η6-p-cymene)RuCl(μ-Cl)]2 and AcmH2 in the presence of NaOH. The reactions of 2 with AgNO3 (in water), pta/AgNO3 or pta/AgOTf/Et3N (in methanol) afforded the nitrate-coordinated complex [(η6-p-cymene)Ru(κO-NO3)(κ2N,N′-AcmH)], 3, the salt [(η6-p-cymene)Ru(κ2N,N′-AcmH)(κP-pta)]NO3, [4]NO3, and the zwitterion [(η6-p-cymene)Ru(κ2N,N′-Acm)(κP-pta)], 5, respectively, in high yields (pta = 1,3,5-triaza-7-phosphatricyclo[3.3.1.1]decane). The reactions of 5 with Brønsted acids yielded the protonated-pta species [(η6-p-cymene)Ru(κ2N,N′-Acm)(κP-ptaH)]X [6]X (X = NO3, TsO). All compounds were fully characterized by analytical and spectroscopic methods, and the structures of 1A, 2 and 5 were elucidated by X-ray diffraction. The stability of the compounds was investigated in aqueous media and 2 and 5 were evaluated for their cytotoxicity towards human ovarian A2780 and A2780cisR cancer cells and non-tumorigenic HEK-293 cells.

Graphical abstract: Versatile coordination of acetazolamide to ruthenium(ii) p-cymene complexes and preliminary cytotoxicity studies

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Supplementary files

Article information


Submitted
19 Apr 2018
Accepted
22 Jun 2018
First published
28 Jun 2018

Dalton Trans., 2018,47, 9367-9384
Article type
Paper

Versatile coordination of acetazolamide to ruthenium(II) p-cymene complexes and preliminary cytotoxicity studies

L. Biancalana, L. K. Batchelor, G. Ciancaleoni, S. Zacchini, G. Pampaloni, P. J. Dyson and F. Marchetti, Dalton Trans., 2018, 47, 9367
DOI: 10.1039/C8DT01555D

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