An unusual ionic cocrystal of ponatinib hydrochloride: characterization by single-crystal X-ray diffraction and ultra-high field NMR spectroscopy

Stirk, Alexander J.; Holmes, Sean T.; Souza, Fabio E. S.; Hung, Ivan; Gan, Zhehong; Britten, James F.; Rey, Allan W.; Schurko, Robert W.

doi:10.1039/D3CE01062G

Title: An unusual ionic cocrystal of ponatinib hydrochloride: characterization by single-crystal X-ray diffraction and ultra-high field NMR spectroscopy

Journal Article · 27 February 2024 · CrystEngComm

DOI: https://doi.org/10.1039/D3CE01062G · OSTI ID:2290428

^[1];

^[2]; Souza, Fabio E. S. ^[1];

^[3];

^[3]; Britten, James F. ^[4]; Rey, Allan W. ^[1];

^[2]

Apotex Pharmachem Inc., Brantford, ON, N3T 6B8, Canada
Department of Chemistry & Biochemistry, Florida State University, Tallahassee, FL 32306, USA, National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
National High Magnetic Field Laboratory, Tallahassee, FL 32310, USA
MAX Diffraction Facility, McMaster University, Hamilton, ON, L8S 4M1, Canada

This study describes the discovery of a unique ionic cocrystal of the active pharmaceutical ingredient (API) ponatinib hydrochloride (pon·HCl), and characterization using single-crystal X-ray diffraction (SCXRD) and solid-state NMR (SSNMR) spectroscopy. Pon·HCl is a multicomponent crystal that features an unusual stoichiometry, with an asymmetric unit containing both monocations and dications of the ponatinib molecule, three water molecules, and three chloride ions. Structural features include (i) a charged imidazopyridazine moiety that forms a hydrogen bond between the ponatinib monocations and dications and (ii) a chloride ion that does not feature hydrogen bonds involving any organic moiety, instead being situated in a “square” arrangement with three water molecules. Multinuclear SSNMR, featuring high and ultra-high fields up to 35.2 T, provides the groundwork for structural interpretation of complex multicomponent crystals in the absence of diffraction data. A 13C CP/MAS spectrum confirms the presence of two crystallographically distinct ponatinib molecules, whereas 1D 1H and 2D 1H–1H DQ–SQ spectra identify and assign the unusually deshielded imidazopyridazine proton. 1D 35Cl spectra obtained at multiple fields confirm the presence of three distinct chloride ions, with density functional theory calculations providing key relationships between the SSNMR spectra and H⋯Cl− hydrogen bonding arrangements. A 2D 35Cl → 1H D-RINEPT spectrum confirms the spatial proximities between the chloride ions, water molecules, and amine moieties. This all suggests future application of multinuclear SSNMR at high and ultra-high fields to the study of complex API solid forms for which SCXRD data are unavailable, with potential application to heterogeneous mixtures or amorphous solid dispersions.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: SC0022310

OSTI ID:: 2290428

Alternate ID(s):: OSTI ID: 2471877

Journal Information:: CrystEngComm, Journal Name: CrystEngComm Vol. 26 Journal Issue: 9; ISSN 1466-8033

Publisher:: Royal Society of Chemistry (RSC)Copyright Statement

Country of Publication:: United Kingdom

Language:: English

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