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Yeffet D, Columbus I, Parvari G, Eichen Y, Saphier S, Ghindes-Azaria L, Redy-Keisar O, Amir D, Drug E, Gershonov E, Binyamin I, Cohen Y, Karton-Lifshin N, Zafrani Y. Addressing the Opioids Lipophilicity Challenge via a Straightforward and Simultaneous 1H NMR-Based log P/ D Determination, Both Separately and in Mixtures. J Med Chem 2024; 67:12399-12409. [PMID: 39013123 DOI: 10.1021/acs.jmedchem.4c01153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/18/2024]
Abstract
A systematic study of trends in the lipophilicity of prominent representatives of the opioid family, including natural, semisynthetic, synthetic, and endogenous neuropeptide opioids, is described. This was enabled by a straightforward 1H NMR-based logP/D determination method developed for compounds holding at least one aromatic hydrogen atom. Moreover, the new method enables a direct simultaneous logD determination of opioid mixtures, overcoming the high sensitivity of this family to the measurement conditions, which is critical when a determination of the exact ΔlogD values of matched pairs is required. Interpretation of the experimental ΔlogD7.4 values of selected matched pairs, focusing inter alia on the 3-OMe and 14-OMe motifs in morphinan opioids, is suggested with the aid of DFT calculations and may be useful for the discovery of new opioid therapeutics.
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Affiliation(s)
- Dina Yeffet
- Department of Organic Chemistry, Israel Institute for Biological Research, Ness-Ziona 74100, Israel
| | - Ishay Columbus
- Department of Organic Chemistry, Israel Institute for Biological Research, Ness-Ziona 74100, Israel
| | - Galit Parvari
- Schulich Faculty of Chemistry Technion, Israel Institute of Technology, Technion City, Haifa 3200008, Israel
| | - Yoav Eichen
- Schulich Faculty of Chemistry Technion, Israel Institute of Technology, Technion City, Haifa 3200008, Israel
| | - Sigal Saphier
- Department of Organic Chemistry, Israel Institute for Biological Research, Ness-Ziona 74100, Israel
| | - Lee Ghindes-Azaria
- Department of Organic Chemistry, Israel Institute for Biological Research, Ness-Ziona 74100, Israel
| | - Orit Redy-Keisar
- Department of Organic Chemistry, Israel Institute for Biological Research, Ness-Ziona 74100, Israel
| | - Dafna Amir
- Department of Organic Chemistry, Israel Institute for Biological Research, Ness-Ziona 74100, Israel
| | - Eyal Drug
- Department of Analytical Chemistry, Israel Institute for Biological Research, Ness-Ziona 74100, Israel
| | - Eytan Gershonov
- Department of Organic Chemistry, Israel Institute for Biological Research, Ness-Ziona 74100, Israel
| | - Iris Binyamin
- Department of Organic Chemistry, Israel Institute for Biological Research, Ness-Ziona 74100, Israel
| | - Yoram Cohen
- School of Chemistry, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
| | - Naama Karton-Lifshin
- Department of Organic Chemistry, Israel Institute for Biological Research, Ness-Ziona 74100, Israel
| | - Yossi Zafrani
- Department of Organic Chemistry, Israel Institute for Biological Research, Ness-Ziona 74100, Israel
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Li Y, Yang X, Yu Y, Zhou X, Zhang R, Sun J, Liu S. Dependence of Intramolecular Hydrogen Bond on Conformational Flexibility in Linear Aminoalcohols. J Phys Chem A 2023; 127:9013-9021. [PMID: 37875015 DOI: 10.1021/acs.jpca.3c04674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2023]
Abstract
Intramolecular hydrogen bonds (H-bonds) are abundant in physicochemical and biological processes. The strength of such interaction is governed by a subtle balance between conformational flexibility and steric effect that are often hard to predict. Herein, using linear aminoalcohols NH2(CH2)nOH (n = 2-5) as a model system, we demonstrated the dependence of intramolecular H-bond on the backbone chain length. With sensitive photoacoustic Raman spectroscopy (PARS), the gas-phase Raman spectra of aminoalcohols were measured in both N-H and O-H stretching regions at 298 and 338 K and explained with the aid of quantum chemistry calculations. For n = 2-4, two conformers corresponding to the O-H···N intramolecular H-bond and free OH were identified, whereas for n = 5, only the free-OH conformer was identified. Compared to free OH, a striking spectral dependence was observed for the intramolecular H-bonded conformer. According to the red shift of the OH-bonded band, the strongest intramolecular H-bond yields in n = 4, but the favorable chain length to form an intramolecular hydrogen bond at room temperature was observed in n = 3, which corresponds to a six-membered-ring in 3-aminopropanol. This is in good agreement with statistical analysis from the Cambridge Structural Database (CSD) that the intramolecular hydrogen bond is preferred when the six-membered ring is formed. Furthermore, combined with the calculated thermodynamic data at the MP2/aug-cc-pVTZ//M062X/6-311++G(d,p) level, the origin of decrease in intramolecular hydrogen-bond formation was ascribed to an unfavorable negative entropy contribution when the backbone chain is further getting longer, which results in the calculated Gibbs free energy optimum changing with increasing temperature from n = 4 (0-200 K) to n = 3 (200-400 K) and to n = 2 (above 400 K). These results will provide new insight into the nature of intramolecular hydrogen bonds at the molecular level and the application of intramolecular hydrogen bonds in rational drug design and supramolecular assembly.
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Affiliation(s)
- Yuhui Li
- School of Physics and Optoelectronic Engineering, Anhui University, Hefei 230601, China
| | - Xinlang Yang
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Yuanqin Yu
- School of Physics and Optoelectronic Engineering, Anhui University, Hefei 230601, China
| | - Xiaoguo Zhou
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
| | - Rui Zhang
- School of Physics and Optoelectronic Engineering, Anhui University, Hefei 230601, China
| | - Jin Sun
- School of Physics and Optoelectronic Engineering, Anhui University, Hefei 230601, China
| | - Shilin Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
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Yap K, Krantzman KD, Lavrich RJ. Inductive Effects on Intramolecular Hydrogen Bond Strength: An Investigation of the Effect of an Electron-Withdrawing CF 3 Group Adjacent to an Alcohol Hydrogen Bond Donor. J Phys Chem A 2023; 127:7892-7897. [PMID: 37713631 PMCID: PMC10544021 DOI: 10.1021/acs.jpca.3c03485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 09/04/2023] [Indexed: 09/17/2023]
Abstract
This combined experimental and theoretical study seeks to determine the role that inductive effects have on hydrogen bonds by an investigation into the change in intramolecular hydrogen bond strength in 2-amino-1-trifluoromethylethanol (2ATFME) relative to that in 2-aminoethanol (2AE). Toward this end, the rotational spectra of the normal, 13C, and 15N isotopologues have been measured using Fourier transform microwave spectroscopy and fit to the rotational, quadrupole coupling, and centrifugal distortion constants of the Watson A-reduction Hamiltonian. Structural parameters used to characterize the strength of the intramolecular hydrogen bond have been determined from the experimental structures of both 2ATFME and 2AE as well as from MP2/6-311++G(d,p) calculations. A comparison of these parameters in 2ATFME with those of 2AE indicates that the electron-withdrawing trifluoromethyl CF3 group strengthens the hydrogen bond. These include a 4% decrease in the distance between the donor and acceptor heavy atoms of the hydrogen bond, a 6% increase toward linearity of the OH···N angle, and a 23% decrease of the COH···N torsional angle toward planarity in 2ATFME relative to 2AE. This trend toward increased intramolecular hydrogen bond strength in 2ATFME is also observed within the ab initio structures.
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Affiliation(s)
- Kaili Yap
- Department of Chemistry and Biochemistry, College of Charleston, 66 George Street, Charleston, South Carolina 29424, United States
| | - Kristin D. Krantzman
- Department of Chemistry and Biochemistry, College of Charleston, 66 George Street, Charleston, South Carolina 29424, United States
| | - Richard J. Lavrich
- Department of Chemistry and Biochemistry, College of Charleston, 66 George Street, Charleston, South Carolina 29424, United States
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Siewert R, Zherikova KV, Verevkin SP. Non-Covalent Interactions in Molecular Systems: Thermodynamic Evaluation of the Hydrogen-Bond Strength in Amino-Ethers and Amino-Alcohols. Chemistry 2022; 28:e202200080. [PMID: 35293642 PMCID: PMC9325416 DOI: 10.1002/chem.202200080] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Indexed: 12/04/2022]
Abstract
The intramolecular hydrogen bond (intra‐HB) is one of the best‐known examples of non‐covalent interactions in molecules. Among the different types of intramolecular hydrogen bonding, the NH⋅⋅⋅O hydrogen bond in amino‐alcohols and amino‐ethers is one of the weakest. In contrast to the strong OH⋅⋅⋅N intramolecular hydrogen bond, the strength of the NH⋅⋅⋅O bond can hardly be measured with conventional spectroscopic methods, even for simple amino‐alcohols, since the band belonging to the NH⋅⋅⋅O conformer merges with the free OH band. In this work, we developed a combination of G4 calculations, and a method based on experimental vaporization enthalpies to determine the NH⋅⋅⋅O hydrogen bonding strength. The archetypal compounds for this study are 2‐amino‐1‐ethanol and 3‐amino‐1‐propanol as well as their respective methoxy analogs. Based on these molecules, different series were studied to investigate various factors influencing NH⋅⋅⋅O intra‐HB strength. In the first series, the influence of alkylation near the hydroxy or methoxy group and the amino group in sterically hindered aminoalcohols was examined. In the second series, the influence of alkylation of the amino‐group was investigated. In the third series, the effect of extending the alkyl chain between functional groups was studied.
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Affiliation(s)
- Riko Siewert
- Department of Physical Chemistry and Faculty of Interdisciplinary Research, Competence Centre CALOR, University of Rostock, 18059, Rostock, Germany
| | - Kseniya V Zherikova
- Nikolaev Institute of Inorganic Chemistry of Siberian Branch of Russian Academy of Sciences, 630090, Novosibirsk, Russia
| | - Sergey P Verevkin
- Department of Physical Chemistry and Faculty of Interdisciplinary Research, Competence Centre CALOR, University of Rostock, 18059, Rostock, Germany
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Hernandes IS, Da Silva HC, Dos Santos HF, Pereira Ávila E, de almeida MV, Gomes MGR, Paschoal D, De Almeida WB. An Investigation of the Predominant Structure of Antibiotic Azithromycin in Chloroform Solution through NMR and Thermodynamic Analysis. Phys Chem Chem Phys 2022; 24:22845-22858. [DOI: 10.1039/d2cp02843c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Azithromycin (AZM) is a well-known macrolide-type antibiotic that has been used in the treatment of infections and inflammations. Knowledge of the predominant molecular structure in solution is a prerequisite for...
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Jabłoński M. Intramolecular Hydrogen Bonding 2021. Molecules 2021; 26:molecules26206319. [PMID: 34684899 PMCID: PMC8539868 DOI: 10.3390/molecules26206319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2021] [Revised: 10/15/2021] [Accepted: 10/15/2021] [Indexed: 11/16/2022] Open
Abstract
Undoubtedly, hydrogen bonds occupy a leading place in the rich world of intermolecular interactions [...].
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Affiliation(s)
- Mirosław Jabłoński
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland
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