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Hansen PE. A Spectroscopic Overview of Intramolecular Hydrogen Bonds of NH…O,S,N Type. Molecules 2021; 26:molecules26092409. [PMID: 33919132 PMCID: PMC8122615 DOI: 10.3390/molecules26092409] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 04/12/2021] [Accepted: 04/18/2021] [Indexed: 02/06/2023] Open
Abstract
Intramolecular NH…O,S,N interactions in non-tautomeric systems are reviewed in a broad range of compounds covering a variety of NH donors and hydrogen bond acceptors. 1H chemical shifts of NH donors are good tools to study intramolecular hydrogen bonding. However in some cases they have to be corrected for ring current effects. Deuterium isotope effects on 13C and 15N chemical shifts and primary isotope effects are usually used to judge the strength of hydrogen bonds. Primary isotope effects are investigated in a new range of magnitudes. Isotope ratios of NH stretching frequencies, νNH/ND, are revisited. Hydrogen bond energies are reviewed and two-bond deuterium isotope effects on 13C chemical shifts are investigated as a possible means of estimating hydrogen bond energies.
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Affiliation(s)
- Poul Erik Hansen
- Department of Science and Environment, Roskilde University, Universitetsvej 1, DK-4000 Roskilde, Denmark
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Pozharskii AF, Dyablo OV, Pogosova OG, Ozeryanskii VA, Filarowski A, Vasilikhina KM, Dzhangiryan NA. Modeling Biologically Important NH···π Interactions Using peri-Disubstituted Naphthalenes. J Org Chem 2020; 85:12468-12481. [DOI: 10.1021/acs.joc.0c01697] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Alexander F. Pozharskii
- Department of Organic Chemistry, Southern Federal University, Zorge 7, 344090 Rostov-on-Don, Russian Federation
| | - Olga V. Dyablo
- Department of Organic Chemistry, Southern Federal University, Zorge 7, 344090 Rostov-on-Don, Russian Federation
| | - Olga G. Pogosova
- Department of Organic Chemistry, Southern Federal University, Zorge 7, 344090 Rostov-on-Don, Russian Federation
| | - Valery A. Ozeryanskii
- Department of Organic Chemistry, Southern Federal University, Zorge 7, 344090 Rostov-on-Don, Russian Federation
| | - Aleksander Filarowski
- Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50-383 Wroclaw, Poland
| | - Kseniya M. Vasilikhina
- Department of Organic Chemistry, Southern Federal University, Zorge 7, 344090 Rostov-on-Don, Russian Federation
| | - Narek A. Dzhangiryan
- Department of Organic Chemistry, Southern Federal University, Zorge 7, 344090 Rostov-on-Don, Russian Federation
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Mikshiev VY, Pozharskii AF, Filarowski A, Novikov AS, Antonov AS, Tolstoy PM, Vovk MA, Khoroshilova OV. How Strong is Hydrogen Bonding to Amide Nitrogen? Chemphyschem 2020; 21:651-658. [PMID: 31953976 DOI: 10.1002/cphc.201901104] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 12/18/2019] [Indexed: 12/23/2022]
Abstract
The protonation of the carboxamide nitrogen atom is an essential part of in vivo and in vitro processes (cis-trans isomerization, amides hydrolysis etc). This phenomenon is well studied in geometrically strongly distorted amides, although there is little data concerning the protonation of undistorted amides. In the latter case, the participation of amide nitrogen in hydrogen bonding (which can be regarded as the incipient state of a proton transfer process) is less well-studied. Thus, it would be a worthy goal to investigate the enthalpy of this interaction. We prepared and investigated a set of peri-substituted naphthalenes containing the protonated dimethylamino group next to the amide nitrogen atom ("amide proton sponges"), which could serve as models for the study of an intramolecular hydrogen bond with the amide nitrogen atom. X-Ray analysis, NMR spectra, basicity values as well as quantum chemical calculations revealed the existence of a hydrogen bond with the amide nitrogen, that should be attributed to the borderline between moderate and weak intramolecular hydrogen bonds (2-7 kcal ⋅ mol-1 ).
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Affiliation(s)
- Vladimir Y Mikshiev
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
| | - Alexander F Pozharskii
- Department of Organic Chemistry, Southern Federal University, Zorge str. 7, 344090, Rostov-on-Don, Russian Federation
| | - Alexander Filarowski
- Faculty of Chemistry, Wroclaw University, F. Joliot-Curie str. 14, 50-383, Wroclaw, Poland
- Industrial University of Tyumen, Volodarskogo str. 38, 625000, Tyumen, Russian Federation
| | - Alexander S Novikov
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
| | - Alexander S Antonov
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
| | - Peter M Tolstoy
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
| | - Mikhail A Vovk
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
| | - Olesya V Khoroshilova
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
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Pozharskii AF, Ozeryanskii VA, Dyablo OV, Pogosova OG, Borodkin GS, Filarowski A. Nucleophilic Substitution of Hydrogen Atom in Initially Inactivated Pyrrole Ring. Org Lett 2019; 21:1953-1957. [PMID: 30854860 DOI: 10.1021/acs.orglett.8b04098] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
It has been found that 1-dialkylamino-8-(pyrrolyl-1)naphthalenes 1 and 6, upon treatment with an equimolar amount of HBF4 under ambient conditions, produce 1-dialkylammonium salts which are transformed into 7,7-dialkyl-7 H-pyrrolo[1,2- a]perimidine-7-ium tetrafluoroborates 5 and 7, respectively. The reaction proceeds in a highly selective manner and represents the first case of nucleophilic substitution of hydrogen in the initially inactivated pyrrole ring. The scope and limitations of the transformation, apparently operating due to the joint action of the "proximity effect" and proton catalysis, are outlined.
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Affiliation(s)
- Alexander F Pozharskii
- Department of Organic Chemistry , Southern Federal University , Zorge str 7 , 344090 Rostov-on-Don , Russian Federation
| | - Valery A Ozeryanskii
- Department of Organic Chemistry , Southern Federal University , Zorge str 7 , 344090 Rostov-on-Don , Russian Federation
| | - Olga V Dyablo
- Department of Organic Chemistry , Southern Federal University , Zorge str 7 , 344090 Rostov-on-Don , Russian Federation
| | - Olga G Pogosova
- Department of Organic Chemistry , Southern Federal University , Zorge str 7 , 344090 Rostov-on-Don , Russian Federation
| | - Gennady S Borodkin
- Institute of Physical and Organic Chemistry , Southern Federal University , Stachki Ave 194/2 , 344090 Rostov-on-Don , Russian Federation
| | - Aleksander Filarowski
- Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50-383 Wroclaw, Poland and Institute of Chemistry , St. Petersburg State University , Universitetskij pr 26 , 198504 St. Petersburg , Russian Federation
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