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Walczak D, Sikorski A, Grzywacz D, Nowacki A, Liberek B. Identification of the furanose ring conformations and the factors driving their adoption. Carbohydr Res 2023; 526:108780. [PMID: 36944302 DOI: 10.1016/j.carres.2023.108780] [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: 01/12/2023] [Revised: 02/23/2023] [Accepted: 02/28/2023] [Indexed: 03/06/2023]
Abstract
Three groups of furanoses with restricted freedom of rotation on the C3-C4, C2-C3, and C1-C2 bonds, respectively, are presented. Conformational analysis of these furanoses is conducted based on the proton nuclear magnetic resonance (1H NMR) spectroscopy, density functional theory (DFT) calculations, and X-ray analysis. It is shown that the particular group of the presented furanoses is locked in the specific conformation. These are the 1T2-like, the 0E-like, and the 3T4-like conformation, respectively. Characteristic 1H NMR spectra of these three conformations are presented and the factors influencing the conformational preferences of the analyzed furanoses are discussed.
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Affiliation(s)
- Dominik Walczak
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland
| | - Artur Sikorski
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland
| | - Daria Grzywacz
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland
| | - Andrzej Nowacki
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland
| | - Beata Liberek
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland.
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Walczak D, Sikorski A, Grzywacz D, Nowacki A, Liberek B. Characteristic 1H NMR spectra of β-d-ribofuranosides and ribonucleosides: factors driving furanose ring conformations. RSC Adv 2022; 12:29223-29239. [PMID: 36320749 PMCID: PMC9557318 DOI: 10.1039/d2ra04274f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 10/03/2022] [Indexed: 11/05/2022] Open
Abstract
A series of β-d-ribofuranosides and ribonucleosides fused with 2,3-O-isopropylidene ring was synthesized and studied in terms of their conformational preferences. Based on the 1H NMR spectra, DFT calculations, and X-ray analysis the E0-like and E4-like conformations adopted by these furanosides are identified. The 3E-like and 2E-like conformations are assigned to ribonucleosides without the 2,3-O-isopropylidene group. The studies are supported by analysis of the structural data of β-d-ribofuranosides and ribonucleosides deposited in the Cambridge Crystallographic Data Center (CCDC) database.† Finally, the factors influencing the conformational preferences of the furanose ring with the β-d-ribo configuration are indicated. These are the unfavorable ecliptic orientation of the 2-OH and 3-OH groups, the 1,3-pseudodiaxial interaction of the aglycone and terminal hydroxymethyl group and the endo-anomeric effect. It is also proved that the exo-anomeric effect acts in β-d-ribofuranosides. The 2,3-O-isopropylidene group locks β-d-ribofuranosides in the E0-like conformation whereas ribonucleosides in the E4-like conformation. The conformational preferences of β-d-ribofuranosides are determined by the anomeric effect.![]()
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Affiliation(s)
- Dominik Walczak
- Faculty of Chemistry, University of GdańskWita Stwosza 6380-308 GdańskPoland
| | - Artur Sikorski
- Faculty of Chemistry, University of GdańskWita Stwosza 6380-308 GdańskPoland
| | - Daria Grzywacz
- Faculty of Chemistry, University of GdańskWita Stwosza 6380-308 GdańskPoland
| | - Andrzej Nowacki
- Faculty of Chemistry, University of GdańskWita Stwosza 6380-308 GdańskPoland
| | - Beata Liberek
- Faculty of Chemistry, University of GdańskWita Stwosza 6380-308 GdańskPoland
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Walczak D, Nowacki A, Trzybiński D, Samaszko-Fiertek J, Myszka H, Sikorski A, Liberek B. Conformational studies of N-(α-d-glucofuranurono-6,3-lactone)- and N-(methyl β-d-glucopyranuronate)-p-nitroanilines. Carbohydr Res 2017; 446-447:85-92. [PMID: 28554013 DOI: 10.1016/j.carres.2017.05.011] [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: 02/06/2017] [Revised: 04/28/2017] [Accepted: 05/13/2017] [Indexed: 10/19/2022]
Abstract
N-(α-d-Glucofuranurono-6,3-lactone)-p-nitroaniline and N-(methyl β-d-glucopyranuronate)-p-nitroaniline were obtained as crystalline solids. The single-crystal X-ray diffraction, NMR data and DFT calculations for N-(α-d-glucofuranurono-6,3-lactone)-p-nitroaniline indicate that this N-furanoside adopts a 3T2/3E-like conformation in the crystal lattice, solution and gas phase. Thus, the structure of recorded for N-furanoside 1H NMR spectrum is indicative of the 3T2/3E region of the pseudorotational itinerary for furanose derivatives with α-d-gluco, β-L-ido and α-d-xylo configurations. Moreover, it is concluded that the 1T2/E2/3T2/3E region of the pseudorotational itinerary for furanose derivatives with d-gluco, L-ido and d-xylo configurations should be characterised by the lack of coupling between H2 and H3 protons, irrespective of the anomeric configuration. Such a lack of vicinal coupling is characteristic for some of the trans-oriented furanose ring protons. The single-crystal X-ray diffraction and NMR data for N-(methyl β-d-glucopyranuronate)-p-nitroaniline indicate that this N-glucuronide adopts the 4C1 conformation, both in the crystal lattice and solution. The occurrence of anomeric effects in the presented N-glycosides is discussed. The crystal structure analysis of both N-glycosides gives evidence that the amine group in p-nitroaniline is planar due to the nitrogen sp2 hybridisation.
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Affiliation(s)
- Dominik Walczak
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
| | - Andrzej Nowacki
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
| | - Damian Trzybiński
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland; Biological and Chemical Research Centre, University of Warsaw, Żwirki i Wigury 101, 02-089 Warsaw, Poland
| | | | - Henryk Myszka
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
| | - Artur Sikorski
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland
| | - Beata Liberek
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308 Gdańsk, Poland.
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Nowacki A, Wielińska J, Walczak D, Sikora K, Dmochowska B, Liberek B. The conformational behavior, geometry and energy parameters of Menshutkin-like reaction of O-isopropylidene-protected glycofuranoid mesylates in view of DFT calculations. J Mol Graph Model 2014; 52:91-102. [PMID: 25023664 DOI: 10.1016/j.jmgm.2014.06.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2014] [Accepted: 06/23/2014] [Indexed: 11/30/2022]
Abstract
The formation of pyridinium salts in the transformation of three O-isopropylidene-protected mesylates of furanoid sugar derivatives under pyridine action is considered at the B3LYP/6-31+G** computation level. All the structures were optimized in the gas phase, in chloroform and water. Activation barrier heights in the gas phase were also estimated at the B3LYP/6-311++G**, MPW1K/6-31+G** and MPW1K/6-311++G** levels. The conducted calculations, both in the gas phase (regardless of the computation level) and in solvents, revealed the barrier height increasing order as follows: 1>2>3 for the three reactions studied. The conformational behavior of the five-membered ring is discussed in the gas phase and in solvents. The fused dioxolane ring makes the furanoid ring less likely to undergo conformational changes. In the case of reaction 3, the furanoid ring shape does not change either in the gas phase or in solvents. All conformers are close to E0 or (0)E.
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Affiliation(s)
- Andrzej Nowacki
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, PL-80-308 Gdańsk, Poland.
| | - Justyna Wielińska
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, PL-80-308 Gdańsk, Poland
| | - Dominik Walczak
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, PL-80-308 Gdańsk, Poland
| | - Karol Sikora
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, PL-80-308 Gdańsk, Poland
| | - Barbara Dmochowska
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, PL-80-308 Gdańsk, Poland
| | - Beata Liberek
- Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, PL-80-308 Gdańsk, Poland
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Xavier NM, Schwarz S, Vaz PD, Csuk R, Rauter AP. Synthesis of Purine Nucleosides fromD-Glucuronic Acid Derivatives and Evaluation of Their Cholinesterase-Inhibitory Activities. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301913] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Schombs MW, Davis RA, Fettinger JC, Gervay-Hague J. A fused [3.3.0]-neoglycoside lactone derived from glucuronic acid. Acta Crystallogr C 2013; 69:1062-6. [PMID: 24005522 PMCID: PMC3769141 DOI: 10.1107/s0108270113013723] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Accepted: 05/17/2013] [Indexed: 11/10/2022] Open
Abstract
The bridged next-generation aminoglycoside (neoglycoside), 1-deoxy-1-[(methoxy)methylamino)]-2,5-di-O-triethylsilyl-β-D-glucofuranurono-γ-lactone {systematic name: (3S,3aS,5R,6R,6aS)-5-[methoxy(methyl)amino]-3,6-bis[(triethylsilyl)oxy]-2,3,3a,5,6,6a-hexahydrofuro[3,2-b]furan-2-one}, C20H41NO6Si2, was synthesized in a one-pot manner from commercially available D-glucuronic acid. This structure supports the properties associated with the anomeric effect for furanosides and can be employed to provide insight into the mechanisms by which alkoxyamine-appended natural products derive their enhanced biological activity. To the best of our knowledge, this is the first published crystal structure of a bicyclic neoglycoside and is the first neoglycoside to be completely and unambiguously characterized.
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Affiliation(s)
- Matthew W. Schombs
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA 95616, USA
| | - Ryan A. Davis
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA 95616, USA
| | - James C. Fettinger
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA 95616, USA
| | - Jacquelyn Gervay-Hague
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA 95616, USA
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