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Jaconelli HS, Kennedy AR. Salt forms of amides: protonation of acetanilide. Acta Crystallogr C Struct Chem 2024; 80:514-522. [PMID: 39115537 PMCID: PMC11371003 DOI: 10.1107/s2053229624007332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2024] [Accepted: 07/23/2024] [Indexed: 09/04/2024] Open
Abstract
Treating the amide acetanilide (N-phenylacetamide, C8H9NO) with aqueous strong acids allowed the structures of five hemi-protonated salt forms of acetanilide to be elucidated. N-(1-Hydroxyethylidene)anilinium chloride-N-phenylacetamide (1/1), [(C8H9NO)2H][Cl], and the bromide, [(C8H9NO)2H][Br], triiodide, [(C8H9NO)2H][I3], tetrafluoroborate, [(C8H9NO)2H][BF4], and diiodobromide hemi(diiodine), [(C8H9NO)2H][I2Br]·0.5I2, analogues all feature centrosymmetric dimeric units linked by O-H...O hydrogen bonds that extend into one-dimensional hydrogen-bonded chains through N-H...X interactions, where X is the halide atom of the anion. Protonation occurs at the amide O atom and results in systematic lengthening of the C=O bond and a corresponding shortening of the C-N bond. The size of these geometric changes is similar to those found for hemi-protonated paracetamol structures, but less than those in fully protonated paracetamol structures. The bond angles of the amide fragments are also found to change on protonation, but these angular changes are also influenced by conformation, namely, whether the amide group is coplanar with the phenyl ring or twisted out of plane.
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Affiliation(s)
- Harry S. Jaconelli
- Department of Pure & Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, United Kingdom
| | - Alan R. Kennedy
- Department of Pure & Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, Scotland, United Kingdom
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2
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Owczarzak A, Przybył AK, Kubicki M. Different cationic forms of (-)-cytisine in the crystal structures of its simple inorganic salts. Acta Crystallogr C Struct Chem 2018; 74:1518-1530. [PMID: 30398209 DOI: 10.1107/s2053229618012585] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 09/05/2018] [Indexed: 11/10/2022] Open
Abstract
The crystal structures of 13 simple salts of cytisine, an alkaloid isolated from the seeds of Laburnum anagyroides, have been determined, namely cytisinium (6-oxo-7,11-diazatricyclo[7.3.1.02,7]trideca-2,4-dien-11-ium) bromide, C11H15N2O+·Br-, cytisinium iodide, C11H15N2O+·I-, cytisinium perchlorate, C11H15N2O+·ClO4-, cytisinium iodide triiodide, C11H15N2O+·I-·I3-, cytisinium chloride monohydrate, C11H15N2O+·Cl-·H2O, cytisinium iodide monohydrate, C11H15N2O+·I-·H2O, cytisinium nitrate monohydrate, C11H15N2O+·NO3-·H2O, hydrogen dicytisinium tribromide, C22H31N4O23+·3Br-, hydrogen dicytisinium triiodide, C22H31N4O23+·3I-, hydrogen dicytisinium triiodide diiodide, C22H31N4O23+·I3-·2I-, hydrogen dicytisinium bis(triiodide) iodide, C22H31N4O23+·2I3-·I-, cytisinediium (6-oxidaniumylidene-7,11-diazatricyclo[7.3.1.02,7]trideca-2,4-dien-11-ium) bis(perchlorate), C11H16N2O2+·2ClO4-, and cytisinediium dichloride trihydrate, C11H16N2O2+·2Cl-·3H2O. Cytisine has two potential protonation sites, i.e. the N atom of the piperidine ring and the carbonyl O atom of the pyridone ring. Three forms of the cytisinium cation were identified, namely the monocation, which is always protonated at the N atom, the dication, which utilizes both protonation sites, and the third form, which contains two cytisine moieties connected by very short and linear O...H...O hydrogen bonds, with an O...O distance of approximately 2.4 Å. This third form may therefore be regarded as a 3+ species, or sesqui-cation, and is observed solely in the salts with bromide, iodide or triiodide (heavier halogen) anions. The cation is quite rigid and all 19 cytisinium fragments in the studied series have very similar conformations. The crystal structures are determined mainly by Coulombic interactions and hydrogen bonds, and the latter form is determined by different networks. Additionally, some anion-π and lone-pair...π secondary interactions are identified in almost all of the crystal structures. Hirshfeld surface analysis generally confirms the role of different interactions in the determination of the crystal architecture.
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Affiliation(s)
- Agata Owczarzak
- Department of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland
| | - Anna K Przybył
- Department of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland
| | - Maciej Kubicki
- Department of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland
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Lee HHL, Heo CE, Seo N, Yun SG, An HJ, Kim HI. Accurate Quantification of N-Glycolylneuraminic Acid in Therapeutic Proteins Using Supramolecular Mass Spectrometry. J Am Chem Soc 2018; 140:16528-16534. [PMID: 30153004 DOI: 10.1021/jacs.8b07864] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Practical applications of innovative host-guest systems are challenging because of unexpected guest competitors and/or subtle environmental differences. Herein, a supramolecular mass spectrometry (MS)-based method using a synthetic host, cucurbit[7]uril (CB[7]), was developed for identifying and quantifying N-glycolylneuraminic acid (Neu5Gc) in therapeutic glycoproteins, which critically reduces drug efficacy. The development of a reliable derivatization-free analytical method for Neu5Gc is highly challenging because of the interference by the abundant N-acetylneuraminic acid (Neu5Ac). CB[7] recognized the subtle structural differences between Neu5Gc and Neu5Ac. Distinct host-guest interactions between CB[7] and the two sialic acids produced a highly linear relationship between the complexation and concentration proportions of the two sialic acids in MS. Furthermore, the developed method had sub-picomolar quantification limits and a wide range of applicability for diverse glycoproteins, demonstrating the potential utility of this method as a reliable assay of Neu5Gc in therapeutic glycoproteins.
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Affiliation(s)
- Hyun Hee L Lee
- Department of Chemistry , Korea University , Seoul 02841 , Republic of Korea
| | - Chae Eun Heo
- Department of Chemistry , Korea University , Seoul 02841 , Republic of Korea
| | - Nari Seo
- Graduate School of Analytical Science & Technology , Chungnam National University , Daejon 34134 , Republic of Korea
| | - Seung Gyu Yun
- Department of Laboratory Medicine , Korea University College of Medicine , Seoul 02841 , Republic of Korea
| | - Hyun Joo An
- Graduate School of Analytical Science & Technology , Chungnam National University , Daejon 34134 , Republic of Korea
| | - Hugh I Kim
- Department of Chemistry , Korea University , Seoul 02841 , Republic of Korea
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Kennedy AR, King NL, Oswald ID, Rollo DG, Spiteri R, Walls A. Structural study of salt forms of amides; paracetamol, benzamide and piperine. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.10.047] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Sudhi G, Rajina SR, Praveen SG, Xavier TS, Kenny PTM, Jaiswal-Nagar D, Binoy J. Investigations of vibrational spectra and bioactivity of novel anticancer drug N-(6-ferrocenyl-2-naphthoyl)-gamma-amino butyric acid ethyl ester. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 185:234-244. [PMID: 28582725 DOI: 10.1016/j.saa.2017.05.056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2016] [Revised: 05/24/2017] [Accepted: 05/26/2017] [Indexed: 06/07/2023]
Abstract
The bioactivity of compounds is mainly dependent on molecular structure and the present work aims to explore the bonding features responsible for biological activity of novel anticancer drug N-(6-ferrocenyl-2-naphthoyl)-gamma-amino butyric acid ethyl ester (FNGABEE). In the present study, we investigate the molecular structural properties of newly synthesized title compound through experimental and quantum chemical studies. The detailed vibrational analysis has been performed using FT IR and FT Raman spectrum, aided by DFT computed geometry, vibrational spectrum, Eigen vector distribution and PED, at B3LYP/6-311++G(d,p) level. The resonance structure of naphthalene, different from that of benzene, revealed by molecular structure has been investigated using CC and CC stretching modes. The proton transfer in amide has been analyzed to obtain spectral distinction between different carbonyl and CN groups which point to the reactive sites responsible for binding with DNA and bovine serum albumin (BSA). The spectral distinction between eclipsed and staggered form of ferrocene has been analyzed. The molecular docking of FNGABEE with BSA and DNA has been performed to find the strength of binding and the moieties responsible for the interactions. The experimental binding studies of FNGABEE with BSA and DNA has been performed using UV absorption spectroscopy and fluorometric assay, to find the nature and strength of binding.
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Affiliation(s)
- Geethu Sudhi
- Department of Physics, University of Kerala, Govt. College for Women, Thiruvananthapuram 695014, Kerala, India
| | - S R Rajina
- Department of Physics, University of Kerala, Govt. College for Women, Thiruvananthapuram 695014, Kerala, India
| | - S G Praveen
- School of Physics, Indian Institute of Science Education and Research, Thiruvananthapuram 695016, India
| | - T S Xavier
- Department of Physics, University of Kerala, Govt. College for Women, Thiruvananthapuram 695014, Kerala, India
| | - Peter T M Kenny
- School of Chemical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland
| | - D Jaiswal-Nagar
- School of Physics, Indian Institute of Science Education and Research, Thiruvananthapuram 695016, India
| | - J Binoy
- Department of Physics, Govt. College for Women, Thiruvananthapuram 695014, Kerala, India.
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Górecki M, Dziedzic A, Luboradzki R, Ostaszewska A, Frelek J, Szczepek WJ. Synthesis and comprehensive structural and physicochemical characterization of dutasteride hydrochloride hydrate solvates. Steroids 2017; 124:72-80. [PMID: 28602645 DOI: 10.1016/j.steroids.2017.05.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Revised: 04/25/2017] [Accepted: 05/31/2017] [Indexed: 11/17/2022]
Abstract
Four crystalline dutasteride hydrochloride hydrate solvates containing respectively methanol, ethanol, acetone and acetonitrile molecules were obtained. All samples were characterized by extensive spectroscopic analysis with infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC) and 1H as well as 13C NMR techniques. For three solvates, i.e. methanol, ethanol and acetone solvates, the single crystal X-ray diffraction (SCXRD) experiments were possible, and their respective crystal and molecular structures were determined. The present study allowed to unambiguously establish the molecular composition of solvates as consisting of a dutasteride : hydrogen chloride : water : solvent in a molar ratio of 1:1:1:1 and confirm that they are isostructural. Beyond providing the full spectroscopic characteristic of the compounds, the results obtained have also allowed clarifying of some appearing inconsistencies in published literature regarding the appropriate attribution of IR absorption bands to the relevant molecular vibrations.
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Affiliation(s)
- Marcin Górecki
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Alicja Dziedzic
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Roman Luboradzki
- Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Anna Ostaszewska
- Pharmaceutical Research Institute, Rydygiera 8, 01-793 Warsaw, Poland
| | - Jadwiga Frelek
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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Skořepová E, Hušák M, Ridvan L, Tkadlecová M, Havlíček J, Dušek M. Iodine salts of the pharmaceutical compound agomelatine: the effect of the symmetric H-bond on amide protonation. CrystEngComm 2016. [DOI: 10.1039/c6ce00304d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Kaur R, Gautam R, Cherukuvada S, Guru Row TN. Do carboximide-carboxylic acid combinations form co-crystals? The role of hydroxyl substitution on the formation of co-crystals and eutectics. IUCRJ 2015; 2:341-51. [PMID: 25995843 PMCID: PMC4420544 DOI: 10.1107/s2052252515002651] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 02/07/2015] [Indexed: 06/01/2023]
Abstract
Carboxylic acids, amides and imides are key organic systems which provide understanding of molecular recognition and binding phenomena important in biological and pharmaceutical settings. In this context, studies of their mutual interactions and compatibility through co-crystallization may pave the way for greater understanding and new applications of their combinations. Extensive co-crystallization studies are available for carboxylic acid/amide combinations, but only a few examples of carboxylic acid/imide co-crystals are currently observed in the literature. The non-formation of co-crystals for carboxylic acid/imide combinations has previously been rationalized, based on steric and computed stability factors. In the light of the growing awareness of eutectic mixtures as an alternative outcome in co-crystallization experiments, the nature of various benzoic acid/cyclic imide combinations is established in this paper. Since an additional functional group can provide sites for new intermolecular inter-actions and, potentially, promote supramolecular growth into a co-crystal, benzoic acids decorated with one or more hydroxyl groups have been systematically screened for co-crystallization with one unsaturated and two saturated cyclic imides. The facile formation of an abundant number of hydroxybenzoic acid/cyclic carboximide co-crystals is reported, including polymorphic and variable stoichiometry co-crystals. In the cases where co-crystals did not form, the combinations are shown invariably to result in eutectics. The presence or absence and geometric disposition of hydroxyl functionality on benzoic acid is thus found to drive the formation of co-crystals or eutectics for the studied carboxylic acid/imide combinations.
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Affiliation(s)
- Ramanpreet Kaur
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560 012, India
| | - Raj Gautam
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560 012, India
| | - Suryanarayan Cherukuvada
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560 012, India
| | - Tayur N. Guru Row
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bengaluru 560 012, India
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9
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Łaszcz M, Trzcińska K, Witkowska A, Lipiec-Abramska E, Szczepek WJ. Phase transition studies of dutasteride crystalline forms. CrystEngComm 2015. [DOI: 10.1039/c5ce00036j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polymorphism of dutasteride is studied. Details of the crystal and molecular structure of unsolvated form I are presented.
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Affiliation(s)
- M. Łaszcz
- Pharmaceutical Research Institute
- 01-793 Warsaw, Poland
| | - K. Trzcińska
- Pharmaceutical Research Institute
- 01-793 Warsaw, Poland
| | - A. Witkowska
- Pharmaceutical Research Institute
- 01-793 Warsaw, Poland
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10
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Conformational and crystal energetics of a polymorphic cyclized product of Napafenac: The Z′ and crystal stability correlation. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2013.10.061] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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11
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Przybył AK, Kubicki M, Hoffmann M. The amide protonation of (-)-N-benzoylcytisine in its perchlorate salts. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 129:1-6. [PMID: 24717715 DOI: 10.1016/j.saa.2014.02.192] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 02/25/2014] [Accepted: 02/27/2014] [Indexed: 06/03/2023]
Abstract
The (13)C NMR spectrum of (-)-N-benzoylcytisine perchlorate does not show a double set of signals typical of amide compounds, although this effect has been observed for the other diamine derivatives of cytisine. This observation means that in solution there must be the state of equilibrium between two forms of the cation with the protonated amide groups. DFT calculations have indeed indicated two preferred tautomeric forms with protonated oxygen atoms of amide groups. In the solid state however, according to X-ray analysis of perchlorate and perchlorate hydrate of N-benzoylcytisine the oxygen atom of the amide group in the six-membered ring A is preferred protonation site as compared with the oxygen in benzoic moiety. (-)-N-benzoylcytisine salt is the first compound from among the known derivatives of quinolizidine alkaloids that are not N-oxides, in which in solid state only the oxygen atom at cyclic amide is protonated instead of nitrogen atom or oxygen in benzoic moiety.
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Affiliation(s)
- Anna K Przybył
- Faculty of Chemistry, A. Mickiewicz University in Poznań, Umultowska 89b, 61-614 Poznań, Poland.
| | - Maciej Kubicki
- Faculty of Chemistry, A. Mickiewicz University in Poznań, Umultowska 89b, 61-614 Poznań, Poland
| | - Marcin Hoffmann
- Faculty of Chemistry, A. Mickiewicz University in Poznań, Umultowska 89b, 61-614 Poznań, Poland
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Liu J, Zheng M, Zhang C, Xu D. “Amide Resonance” in the Catalysis of 1,2-α-l-Fucosidase from Bifidobacterium bifidum. J Phys Chem B 2013; 117:10080-92. [DOI: 10.1021/jp402110j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jingli Liu
- Key
Laboratory of Green Chemistry and Technology, College
of Chemistry, Ministry of Education, Chengdu, Sichuan 610064, P. R. China
| | - Min Zheng
- Key
Laboratory of Green Chemistry and Technology, College
of Chemistry, Ministry of Education, Chengdu, Sichuan 610064, P. R. China
| | - Chunchun Zhang
- Testing & Analytical Center, Sichuan University, Chengdu, Sichuan 610064, P. R. China
| | - Dingguo Xu
- Key
Laboratory of Green Chemistry and Technology, College
of Chemistry, Ministry of Education, Chengdu, Sichuan 610064, P. R. China
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Affiliation(s)
- Michal Szostak
- Department of Medicinal Chemistry, University of Kansas, Delbert M. Shankel Structural Biology Center, 2034 Becker Drive, Lawrence, Kansas 66047
| | - Jeffrey Aubé
- Department of Medicinal Chemistry, University of Kansas, Delbert M. Shankel Structural Biology Center, 2034 Becker Drive, Lawrence, Kansas 66047
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Babu NJ, Sanphui P, Nath NK, Khandavilli UBR, Nangia A. Temozolomide hydrochloride dihydrate. CrystEngComm 2013. [DOI: 10.1039/c2ce26528a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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