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Tsutsui M, Sianturi J, Masui S, Tokunaga K, Manabe Y, Fukase K. Efficient Synthesis of Antigenic Trisaccharides ContainingN-Acetylglucosamine: Protection of NHAc as NAc2. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901809] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Masato Tsutsui
- Department of Chemistry; Graduate School of Science; Osaka University; Machikaneyama 1-1, Toyonaka 560-0043 Osaka Japan
| | - Julinton Sianturi
- Department of Chemistry; Graduate School of Science; Osaka University; Machikaneyama 1-1, Toyonaka 560-0043 Osaka Japan
| | - Seiji Masui
- Department of Chemistry; Graduate School of Science; Osaka University; Machikaneyama 1-1, Toyonaka 560-0043 Osaka Japan
| | - Kento Tokunaga
- Department of Chemistry; Graduate School of Science; Osaka University; Machikaneyama 1-1, Toyonaka 560-0043 Osaka Japan
| | - Yoshiyuki Manabe
- Department of Chemistry; Graduate School of Science; Osaka University; Machikaneyama 1-1, Toyonaka 560-0043 Osaka Japan
- Core for Medicine and Science Collaborative Research and Education; Project Research Center for Fundamental Science; Osaka University; Osaka Japan
| | - Koichi Fukase
- Department of Chemistry; Graduate School of Science; Osaka University; Machikaneyama 1-1, Toyonaka 560-0043 Osaka Japan
- Core for Medicine and Science Collaborative Research and Education; Project Research Center for Fundamental Science; Osaka University; Osaka Japan
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Andrushchenko V, Matějka P, Anderson DT, Kaminský J, Horníček J, Paulson LO, Bouř P. Solvent Dependence of the N-Methylacetamide Structure and Force Field. J Phys Chem A 2009; 113:9727-36. [DOI: 10.1021/jp9045512] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Valery Andrushchenko
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences,
Flemingovo nám. 2, 16610, Praha 6, Czech Republic, Department
of Analytical Chemistry, Institute of Chemical Technology, Technická
5, 166 28, Prague 6, Czech Republic, and Department of Chemistry,
University of Wyoming, 1000 East University Avenue, Laramie, Wyoming
82071
| | - Pavel Matějka
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences,
Flemingovo nám. 2, 16610, Praha 6, Czech Republic, Department
of Analytical Chemistry, Institute of Chemical Technology, Technická
5, 166 28, Prague 6, Czech Republic, and Department of Chemistry,
University of Wyoming, 1000 East University Avenue, Laramie, Wyoming
82071
| | - David T. Anderson
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences,
Flemingovo nám. 2, 16610, Praha 6, Czech Republic, Department
of Analytical Chemistry, Institute of Chemical Technology, Technická
5, 166 28, Prague 6, Czech Republic, and Department of Chemistry,
University of Wyoming, 1000 East University Avenue, Laramie, Wyoming
82071
| | - Jakub Kaminský
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences,
Flemingovo nám. 2, 16610, Praha 6, Czech Republic, Department
of Analytical Chemistry, Institute of Chemical Technology, Technická
5, 166 28, Prague 6, Czech Republic, and Department of Chemistry,
University of Wyoming, 1000 East University Avenue, Laramie, Wyoming
82071
| | - Jan Horníček
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences,
Flemingovo nám. 2, 16610, Praha 6, Czech Republic, Department
of Analytical Chemistry, Institute of Chemical Technology, Technická
5, 166 28, Prague 6, Czech Republic, and Department of Chemistry,
University of Wyoming, 1000 East University Avenue, Laramie, Wyoming
82071
| | - Leif O. Paulson
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences,
Flemingovo nám. 2, 16610, Praha 6, Czech Republic, Department
of Analytical Chemistry, Institute of Chemical Technology, Technická
5, 166 28, Prague 6, Czech Republic, and Department of Chemistry,
University of Wyoming, 1000 East University Avenue, Laramie, Wyoming
82071
| | - Petr Bouř
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences,
Flemingovo nám. 2, 16610, Praha 6, Czech Republic, Department
of Analytical Chemistry, Institute of Chemical Technology, Technická
5, 166 28, Prague 6, Czech Republic, and Department of Chemistry,
University of Wyoming, 1000 East University Avenue, Laramie, Wyoming
82071
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Bordallo HN, Argyriou DN, Barthès M, Kalceff W, Rols S, Herwig KW, Fehr C, Juranyi F, Seydel T. Hydrogen in N-Methylacetamide: Positions and Dynamics of the Hydrogen Atoms Using Neutron Scattering. J Phys Chem B 2007; 111:7725-34. [PMID: 17571870 DOI: 10.1021/jp068528z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This work reports neutron diffraction and incoherent neutron scattering experiments on N-methylacetamide (NMA), which can be considered the model building block for the peptide linkage of polypeptides and proteins. Using the neutron data, we have been able to associate the onset of a striking negative thermal expansion (NTE) along the a-axis with a dynamical transition around 230 K, consistent with our calorimetric experiments. Observation of the NTE raises the question of possible proton transfer in NMA, which, from our data alone, still cannot be settled. We can only speculate that intermolecular repulsive forces increase as the O...H distance decreases upon cooling, and that around 230 K the lattice relaxes without observation of an actual proton transfer. However, the existence of a nonharmonic potential, reflected by the behavior of the phonon vibrations together with the observation of NTE, could be justified by the "vibrational" polaron theory in which a dynamic localization of the vibrational energy is created by coupling an internal molecular mode to a lattice phonon. More generally, this work shows that neutron powder diffraction techniques can be very powerful for investigating structural deformations in small peptide systems.
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