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Mikshiev VY, Tolstoy P, Tupikina EY, Puzyk AM, Vovk MA. Acid catalysis through N-protonation in undistorted carboxamides: improvement of amide proton sponge acylating ability. NEW J CHEM 2022. [DOI: 10.1039/d2nj02975h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Acid catalysis of weakly distorted or undistorted carboxamides in acyl-migration reactions proceeding through N-protonation is the process with low probability in contrast to O-protonation. This circumstance made the experimental study...
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2
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Yang S, Hong B, Feng J, Gu Z. Construction of 2-Amino-2'-ketonyl Biaryls via Acid-Mediated Ring Opening of 9 H-Fluoren-9-ols with Organic Azides. Org Lett 2021; 23:9179-9183. [PMID: 34779635 DOI: 10.1021/acs.orglett.1c03484] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A direct cross-coupling between 9H-fluoren-9-ols and organic azides for the synthesis of steric hindered 2-amino-2'-ketonyl biaryls was reported. The reaction featured an acid-mediated azidation/ring-expansion/hydrolysis cascade, which formally realized the C-N bond coupling reaction via cleavage of a C-C single bond. This method was applicable to chiral helical structure to give bulky axially chiral biaryls with full stereospecificity.
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Affiliation(s)
- Shan Yang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Biqiong Hong
- College of Materials and Chemical Engineering, Minjiang University, Fuzhou, Fujian 350108, P. R. China
| | - Jia Feng
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
| | - Zhenhua Gu
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.,College of Materials and Chemical Engineering, Minjiang University, Fuzhou, Fujian 350108, P. R. China
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3
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Abstract
In this contribution, we provide a comprehensive overview of acyclic twisted amides, covering the literature since 1993 (the year of the first recognized report on acyclic twisted amides) through June 2020. The review focuses on classes of acyclic twisted amides and their key structural properties, such as amide bond twist and nitrogen pyramidalization, which are primarily responsible for disrupting nN to π*C═O conjugation. Through discussing acyclic twisted amides in comparison with the classic bridged lactams and conformationally restricted cyclic fused amides, the reader is provided with an overview of amidic distortion that results in novel conformational features of acyclic amides that can be exploited in various fields of chemistry ranging from organic synthesis and polymers to biochemistry and structural chemistry and the current position of acyclic twisted amides in modern chemistry.
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Affiliation(s)
- Guangrong Meng
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Jin Zhang
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States.,College of Chemistry and Chemical Engineering, Key Laboratory of Chemical Additives for China National Light Industry, Shaanxi University of Science and Technology, Xi'an 710021, China
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
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4
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Xu M, Paul MK, Bullard KK, DuPre C, Gutekunst WR. Modulating Twisted Amide Geometry and Reactivity Through Remote Substituent Effects. J Am Chem Soc 2021; 143:14657-14666. [PMID: 34463473 DOI: 10.1021/jacs.1c05854] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The unusual reactivity of twisted amides has long been associated with the degree of amide distortion, though classical bridged bicyclic amides offer limited methods to further modify these parameters. Here, we report that the geometry and reactivity of a single twisted amide scaffold can be significantly modulated through remote substituent effects. Guided by calculated ground state geometries, a library of twisted amide derivatives was efficiently prepared through a divergent synthetic strategy. Kinetic and mechanistic investigations of these amides in the alkylation/halide-rebound ring-opening reaction with alkyl halides show a strong positive correlation between the electron donating ability of the substituent and distortion of the amide bond, leading to rates of nucleophilic substitution spanning nearly 2 orders of magnitude. The rate limiting step of the cascade sequence is found to be dependent on the nature of the substituent, and additional studies highlight the role of solvent polarity and halide ion on reaction pathway and efficiency.
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Linet A, Joseph MM, Haritha M, Shamna K, Varughese S, Devi PS, Suresh CH, Maiti KK, Neogi I. De novo design and synthesis of boomerang-shaped molecules and their in silico and SERS-based interactions with SARS-CoV-2 spike protein and ACE2. NEW J CHEM 2021. [DOI: 10.1039/d1nj02955j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Boomerang shaped molecule and its interaction study with SARS-CoV-2 S-protein–ACE2 using molecular docking, SERS and UV-Vis spectroscopy.
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Affiliation(s)
- Amrutham Linet
- CSIR-National Institute for Interdisciplinary Sciences and Technology (CSIR-NIIST), Thiruvananthapuram, 695019, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Manu M. Joseph
- CSIR-National Institute for Interdisciplinary Sciences and Technology (CSIR-NIIST), Thiruvananthapuram, 695019, India
| | - Mambatta Haritha
- CSIR-National Institute for Interdisciplinary Sciences and Technology (CSIR-NIIST), Thiruvananthapuram, 695019, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - K. Shamna
- CSIR-National Institute for Interdisciplinary Sciences and Technology (CSIR-NIIST), Thiruvananthapuram, 695019, India
| | - Sunil Varughese
- CSIR-National Institute for Interdisciplinary Sciences and Technology (CSIR-NIIST), Thiruvananthapuram, 695019, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - P. Sujatha Devi
- CSIR-National Institute for Interdisciplinary Sciences and Technology (CSIR-NIIST), Thiruvananthapuram, 695019, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - C. H. Suresh
- CSIR-National Institute for Interdisciplinary Sciences and Technology (CSIR-NIIST), Thiruvananthapuram, 695019, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Kaustabh Kumar Maiti
- CSIR-National Institute for Interdisciplinary Sciences and Technology (CSIR-NIIST), Thiruvananthapuram, 695019, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Ishita Neogi
- CSIR-National Institute for Interdisciplinary Sciences and Technology (CSIR-NIIST), Thiruvananthapuram, 695019, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
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Deng Q, Zheng Q, Zuo B, Tu T. Robust NHC-palladacycles-catalyzed Suzuki−Miyaura cross-coupling of amides via C-N activation. Green Synthesis and Catalysis 2020; 1:75-8. [DOI: 10.1016/j.gresc.2020.06.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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8
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Li G, Szostak M. Transition-Metal-Free Activation of Amides by N-C Bond Cleavage. CHEM REC 2019; 20:649-659. [PMID: 31833633 DOI: 10.1002/tcr.201900072] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 11/07/2019] [Accepted: 11/11/2019] [Indexed: 12/11/2022]
Abstract
The amide bond N-C activation represents a powerful strategy in organic synthesis to functionalize the historically inert amide linkage. This personal account highlights recent remarkable advances in transition-metal-free activation of amides by N-C bond cleavage, focusing on both (1) mechanistic aspects of ground-state-destabilization of the amide bond enabling formation of tetrahedral intermediates directly from amides with unprecedented selectivity, and (2) synthetic utility of the developed transformations. Direct nucleophilic addition to amides enables a myriad of powerful methods for the formation of C-C, C-N, C-O and C-S bonds, providing a straightforward and more synthetically useful alternative to acyl-metals.
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Affiliation(s)
- Guangchen Li
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, United States
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, United States
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9
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Xu M, Bullard KK, Nicely AM, Gutekunst WR. Resonance promoted ring-opening metathesis polymerization of twisted amides. Chem Sci 2019; 10:9729-9734. [PMID: 32055341 PMCID: PMC6993617 DOI: 10.1039/c9sc03602d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2019] [Accepted: 08/30/2019] [Indexed: 12/31/2022] Open
Abstract
The living ring-opening metathesis polymerization (ROMP) of an unsaturated twisted amide using the third-generation Grubbs initiator is described. Unlike prior examples of ROMP monomers that rely on angular or steric strain for propagation, this system is driven by resonance destabilization of the amide that arises from geometric constraints of the bicyclic framework. Upon ring-opening, the amide can rotate and rehybridize to give a stabilized and planar conjugated system that promotes living propagation. The absence of other strain elements in the twisted amide is supported by the inability of a carbon analogue of the monomer to polymerize and computational studies that find resonance destabilization accounts for 11.3 kcal mol-1 of the overall 12.0 kcal mol-1 ring strain. The twisted amide polymerization is capable of preparing high molecular weight polymers rapidly at room temperature, and post-polymerization modification combined with 2D NMR spectroscopy confirms a regioirregular polymer microstructure.
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Affiliation(s)
- Mizhi Xu
- School of Chemistry and Biochemistry , Georgia Institute of Technology , 901 Atlantic Drive NW , Atlanta , Georgia 30332 , USA .
| | - Krista K Bullard
- School of Chemistry and Biochemistry , Georgia Institute of Technology , 901 Atlantic Drive NW , Atlanta , Georgia 30332 , USA .
| | - Aja M Nicely
- School of Chemistry and Biochemistry , Georgia Institute of Technology , 901 Atlantic Drive NW , Atlanta , Georgia 30332 , USA .
| | - Will R Gutekunst
- School of Chemistry and Biochemistry , Georgia Institute of Technology , 901 Atlantic Drive NW , Atlanta , Georgia 30332 , USA .
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Aroche DP, Vargas JP, Nogara PA, da Silveira Santos F, da Rocha JBT, Lüdtke DS, Rodembusch FS. Glycoconjugates Based on Supramolecular Tröger's Base Scaffold: Synthesis, Photophysics, Docking, and BSA Association Study. ACS Omega 2019; 4:13509-13519. [PMID: 31460480 PMCID: PMC6705216 DOI: 10.1021/acsomega.9b01857] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Accepted: 07/18/2019] [Indexed: 05/03/2023]
Abstract
This study presents new Tröger's bases bearing glycosyl moieties obtained from a copper-catalyzed azide-alkyne cycloaddition reaction. The Tröger's bases present absorption maxima close to 275 nm related to fully spin and symmetry-allowed electronic transitions. The main fluorescence emission located at 350 nm was observed with no influence on the glycosyl moieties. Furthermore, protein detection studies have been performed using bovine serum albumin (BSA) as a model protein, and results have shown a strong interaction between some of the compounds through a static fluorescence suppression mechanism related to the formation of a glycoconjugate-BSA complex favored by the glycosyl subunit. Moreover, docking was also studied for better understanding the suppression mechanism and indicated that the glycosyl and triazole moieties increase the affinity with BSA.
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Affiliation(s)
- Débora
Muller Pimentel Aroche
- Grupo
de Pesquisa em Fotoquímica Orgânica Aplicada, Universidade Federal do Rio Grande do Sul, UFRGS,
Instituto de Química, Av. Bento Gonçalves 9500, CEP 91501-970 Porto Alegre, RS, Brazil
| | - Jaqueline Pinto Vargas
- Instituto
de Química, Universidade Federal
do Rio Grande do Sul, UFRGS, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil
| | - Pablo Andrei Nogara
- Departamento
de Bioquímica e Biologia Molecular, Centro de Ciências
Naturais e Exatas, Universidade Federal
de Santa Maria, UFSM, 97105-900 Santa Maria, RS, Brazil
| | - Fabiano da Silveira Santos
- Grupo
de Pesquisa em Fotoquímica Orgânica Aplicada, Universidade Federal do Rio Grande do Sul, UFRGS,
Instituto de Química, Av. Bento Gonçalves 9500, CEP 91501-970 Porto Alegre, RS, Brazil
| | - João Batista Teixeira da Rocha
- Departamento
de Bioquímica e Biologia Molecular, Centro de Ciências
Naturais e Exatas, Universidade Federal
de Santa Maria, UFSM, 97105-900 Santa Maria, RS, Brazil
| | - Diogo Seibert Lüdtke
- Instituto
de Química, Universidade Federal
do Rio Grande do Sul, UFRGS, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, RS, Brazil
| | - Fabiano Severo Rodembusch
- Grupo
de Pesquisa em Fotoquímica Orgânica Aplicada, Universidade Federal do Rio Grande do Sul, UFRGS,
Instituto de Química, Av. Bento Gonçalves 9500, CEP 91501-970 Porto Alegre, RS, Brazil
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11
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Abstract
A modular and efficient synthesis of highly twisted N-acylimidazoles is reported. These twist amides were characterized via X-ray crystallography, NMR spectroscopy, IR spectroscopy, and DFT calculations. Modification of the substituent proximal to the amide revealed a maximum torsional angle of 88.6° in the solid state, which may be the most twisted amide reported for a nonbicyclic system to date. Reactivity and stability studies indicate that these twisted N-acylimidazoles may be valuable, namely as acyl transfer reagents.
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Affiliation(s)
- Elizabeth A. Stone
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Brandon Q. Mercado
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
| | - Scott J. Miller
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
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12
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Affiliation(s)
- Liangbing Fu
- School of Chemistry and Biochemistry, Georgia Institute of Technology, 901 Atlantic Drive NW, Atlanta, Georgia 30332, United States
| | - Mizhi Xu
- School of Chemistry and Biochemistry, Georgia Institute of Technology, 901 Atlantic Drive NW, Atlanta, Georgia 30332, United States
| | - Jiyao Yu
- School of Chemistry and Biochemistry, Georgia Institute of Technology, 901 Atlantic Drive NW, Atlanta, Georgia 30332, United States
| | - Will R. Gutekunst
- School of Chemistry and Biochemistry, Georgia Institute of Technology, 901 Atlantic Drive NW, Atlanta, Georgia 30332, United States
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13
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Abstract
Bridged lactams represent the most effective and wide-ranging method of constraining the amide bond in a non-planar conformation. A previous comprehensive review on this topic was published in 2013 (Chem. Rev.2013, 113, 5701–5765). In the present review, which is published as a part of the Special Issue on Amide Bond Activation, we present an overview of the recent developments in the field of bridged lactams that have taken place in the last five years and present a critical assessment of the current status of bridged lactams in synthetic and physical organic chemistry. This review covers the period from 2014 until the end of 2018 and is intended as an update to Chem. Rev.2013, 113, 5701–5765. In addition to bridged lactams, the review covers recent advances in the chemistry of bridged sultams, bridged enamines and related non-planar structures.
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