1
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Yan X, Du M, Li J, Xue Y, Wu Y, Zhang H, Wang X, Xu D. A theoretical study of the mechanism of cationic polymerization of isobutylene catalysed by EtAlCl 2/ t-BuCl with bis(2-chloroethyl)ether in hexanes. Phys Chem Chem Phys 2024; 26:6763-6773. [PMID: 38323624 DOI: 10.1039/d3cp05337g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2024]
Abstract
The mechanism of cationic polymerization of isobutylene catalyzed by t-BuCl/ethylaluminum dichloride (EADC) combined with bis(2-chloroethyl)ether (CEE) in n-hexane solvent has been investigated using ab initio molecular dynamics (AIMD) and metadynamics (MTD) simulations. The results indicated that the polyisobutylene (PIB) initiation stage involves a clear two-step mechanism. Calculation of the free energy landscapes of the other two ether reactions reveals that the energy barriers of diisopropyl ether (i-Pr2O) and 2-chloroethyl ethyl ether (CEEE) are much higher than those of CEE, which is consistent with the experimental results. During the chain propagation phase, the required free energy barrier gradually decreases and tends to reach equilibrium as the chain length increases. Finally, the oxonium mechanism during the chain initiation stage was investigated by calculating the 1H NMR spectra and MTD simulation. Our calculations can confirm that the existence of tert-butyloxonium ions during the reaction is possible. Their contribution to the whole reaction is further discussed.
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Affiliation(s)
- Xinrong Yan
- College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, P. R. China.
| | - Meng Du
- College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, P. R. China.
| | - Jiwei Li
- Chengdu Migersi Medical Technology Co., Ltd, Chengdu, Sichuan, 610219, P. R. China
| | - Ying Xue
- College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, P. R. China.
| | - Yibo Wu
- The College of New Materials and Chemical Engineering, Beijing Key Lab of Special Elastomer Composite Materials, Beijing Institute of Petrochemical Technology, Beijing, 102617, P. R. China
| | - Hao Zhang
- Chengdu Migersi Medical Technology Co., Ltd, Chengdu, Sichuan, 610219, P. R. China
| | - Xin Wang
- College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, P. R. China.
| | - Dingguo Xu
- College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, P. R. China.
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2
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Ha HJ. Recent advances in synthesizing and utilizing nitrogen-containing heterocycles. Front Chem 2023; 11:1279418. [PMID: 38025071 PMCID: PMC10646977 DOI: 10.3389/fchem.2023.1279418] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2023] [Accepted: 10/13/2023] [Indexed: 12/01/2023] Open
Abstract
The use of organocatalysts and a pot economy has strengthened recent organic syntheses. Synthetic methodologies may be applicable in laboratory preparation or in the industrial production of valuable organic compounds. In most cases, synthetic challenges are overcome by highly efficient and environmentally benign organocatalysts in a pot-economical manner. This is exemplified by the recent synthesis of tetrahydropyridine-containing (-)-quinine.
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Affiliation(s)
- Hyun-Joon Ha
- Department of Chemistry, Hankuk University of Foreign Studies, Yongin, Republic of Korea
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3
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Scepankova H, Galante D, Espinoza-Suaréz E, Pinto CA, Estevinho LM, Saraiva J. High Hydrostatic Pressure in the Modulation of Enzymatic and Organocatalysis and Life under Pressure: A Review. Molecules 2023; 28:molecules28104172. [PMID: 37241913 DOI: 10.3390/molecules28104172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 04/19/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
The interest in high hydrostatic pressure (HHP) is mostly focused on the inactivation of deleterious enzymes, considering the quality-related issues associated with enzymes in foods. However, more recently, HHP has been increasingly studied for several biotechnological applications, including the possibility of carrying out enzyme-catalyzed reactions under high pressure. This review aims to comprehensively present and discuss the effects of HHP on the kinetic catalytic action of enzymes and the equilibrium of the reaction when enzymatic reactions take place under pressure. Each enzyme can respond differently to high pressure, mainly depending on the pressure range and temperature applied. In some cases, the enzymatic reaction remains significantly active at high pressure and temperature, while at ambient pressure it is already inactivated or possesses minor activity. Furthermore, the effect of temperature and pressure on the enzymatic activity indicated a faster decrease in activity when elevated pressure is applied. For most cases, the product concentration at equilibrium under pressure increased; however, in some cases, hydrolysis was preferred over synthesis when pressure increased. The compiled evidence of the effect of high pressure on enzymatic activity indicates that pressure is an effective reaction parameter and that its application for enzyme catalysis is promising.
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Affiliation(s)
- Hana Scepankova
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
- CIMO, Mountain Research Center Polytechnic Institute of Bragança, Campus Santa Apolónia, 5301-855 Bragança, Portugal
| | - Diogo Galante
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
| | | | - Carlos A Pinto
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Letícia M Estevinho
- CIMO, Mountain Research Center Polytechnic Institute of Bragança, Campus Santa Apolónia, 5301-855 Bragança, Portugal
| | - Jorge Saraiva
- LAQV-REQUIMTE, Department of Chemistry, University of Aveiro, 3810-193 Aveiro, Portugal
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4
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Kalinin AV, Zuev VV. An Improvement of Mechanical Properties of Two Kinds of Silicone Resins Containing Ladder Segments by Chemical Modification with Trimethylborate. MATERIALS (BASEL, SWITZERLAND) 2023; 16:3072. [PMID: 37109907 PMCID: PMC10144118 DOI: 10.3390/ma16083072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 04/05/2023] [Accepted: 04/11/2023] [Indexed: 06/19/2023]
Abstract
We suggest a new method for postsynthesis modification of silicones containing silanol groups. It was found that trimethylborate is an effective catalyst for dehydrative condensation of silanol groups with the formation of ladder-like blocks. The utility of this approach was demonstrated on postsynthesis modification of poly-(block poly(dimethylsiloxane)-block ladder-like poly(phenylsiloxane)) and poly-(block poly((3,3',3″-trifluoropropyl-methyl)siloxane)-block ladder-like poly(phenylsiloxane) with a combination of linear and ladder-like blocks having silanol groups. The postsynthesis modification leads to a 75% increase in tensile strength and 116% elongation on break in comparison with the starting polymer.
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Affiliation(s)
- Alexei V. Kalinin
- S.V. Lebedev State Institute of Synthetic Rubber, 1, Gapsalskaya St. 1, 198035 Saint Petersburg, Russia
| | - Vjacheslav V. Zuev
- Chemical Engineering Centrum, ITMO University, Kronverkskiy Pr. 49, 197101 Saint Petersburg, Russia
- Institute of Macromolecular Compounds of the Russian Academy of Sciences, Bolshoi Pr. 31, 199004 Saint Petersburg, Russia
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5
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A Brief Review: Advancement in the Synthesis of Amine through the Leuckart Reaction. REACTIONS 2023. [DOI: 10.3390/reactions4010007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
This review presents a summary of reactions that take place during the “Leuckart-type reaction”. The significance of, as well as recent advancements in, the synthesis of amines through simple and inexpensive methods using readily available raw materials is discussed. This review includes all catalytic and noncatalytic reactions that involve the Leuckart method. Recent studies have shown that at least a quarter of C–N bond-forming reactions in the pharmaceutical industry are occur with the support of reductive amination. Recently, experimental conditions have achieved excellent yields. The “Leuckart-type reaction” is technically associated with Eschweiler–Clarke methylation. Compounds are grouped in accordance with the precept of action. This includes drugs affecting the central nervous system, cardiovascular system and gastrointestinal tract; anticancer drugs, antibiotics, antiviral and antifungal drugs; drugs affecting anxiety; convulsant, biotic, and HIV drugs; and antidiabetic drugs. Therefore, this review supports the development of the Leuckart-type preparation of nitrogenous compounds, as well as their advancement in other areas of human development.
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6
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Kaya C, Birgül K, Bülbül B. Fundamentals of chirality, resolution, and enantiopure molecule synthesis methods. Chirality 2023; 35:4-28. [PMID: 36366874 DOI: 10.1002/chir.23512] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 09/23/2022] [Accepted: 10/11/2022] [Indexed: 11/13/2022]
Abstract
The chirality of molecules is a concept that explains the interactions in nature. We may observe the same formula but different organizations revolving around the chiral center. Since Pasteur's meticulous observation of sodium ammonium tartrate crystals' structure, scientists have discovered many features of chiral molecules. The number of newly approved single enantiomeric drugs increases every year and takes place in the market. Thus, separation or resolution methods of racemic mixtures are of continued importance in the efficacy of drugs, installation of affordable production processes, and convenient synthetic chemistry practice. This article presents the asymmetric synthesis approaches and the classification of direct resolution methods of chiral molecules.
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Affiliation(s)
- Cem Kaya
- Department of Pharmacy, Haydarpasa Numune Training and Research Hospital, İstanbul, Turkey.,Department of Pharmaceutical Chemistry, School of Pharmacy, Altınbaş University, İstanbul, Turkey
| | - Kaan Birgül
- Department of Pharmaceutical Chemistry, School of Pharmacy, Bahçeşehir University, İstanbul, Turkey
| | - Bahadır Bülbül
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Düzce University, Düzce, Turkey
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7
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Zeng Y, Lemay JC, Dong Y, Garcia J, Groves MN, McBreen PH. Ligand-Assisted Carbonyl Bond Activation in Single Diastereomeric Complexes on Platinum. ACS Catal 2022. [DOI: 10.1021/acscatal.2c03253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Yang Zeng
- CCVC and Department of Chemistry, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Jean-Christian Lemay
- CCVC and Department of Chemistry, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Yi Dong
- CCVC and Department of Chemistry, Université Laval, Québec, Québec G1V 0A6, Canada
| | - James Garcia
- Department of Chemistry and Biochemistry, California State University Fullerton, Fullerton, California 92831, United States
| | - Michael. N Groves
- Department of Chemistry and Biochemistry, California State University Fullerton, Fullerton, California 92831, United States
| | - Peter H. McBreen
- CCVC and Department of Chemistry, Université Laval, Québec, Québec G1V 0A6, Canada
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8
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Wheaton AM, Chipman JA, Roy MD, Berry JF. Metal-Metal Bond Umpolung in Heterometallic Extended Metal Atom Chains. Inorg Chem 2022; 61:15058-15069. [PMID: 36094078 PMCID: PMC9632685 DOI: 10.1021/acs.inorgchem.2c02118] [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] [Indexed: 11/28/2022]
Abstract
![]()
Understanding the fundamental properties governing metal–metal
interactions is crucial to understanding the electronic structure
and thereby applications of multimetallic systems in catalysis, material
science, and magnetism. One such property that is relatively underexplored
within multimetallic systems is metal–metal bond polarity,
parameterized by the electronegativities (χ) of the metal atoms
involved in the bond. In heterobimetallic systems, metal–metal
bond polarity is a function of the donor–acceptor (Δχ)
interactions of the two bonded metal atoms, with electropositive early
transition metals acting as electron acceptors and electronegative
late transition metals acting as electron donors. We show in this
work, through the preparation and systematic study of a series of
Mo2M(dpa)4(OTf)2 (M = Cr, Mn, Fe,
Co, and Ni; dpa = 2,2′-dipyridylamide; OTf = trifluoromethanesulfonate)
heterometallic extended metal atom chain (HEMAC) complexes that this
expected trend in χ can be reversed. Physical characterization
via single-crystal X-ray diffraction, magnetometry, and spectroscopic
methods as well as electronic structure calculations supports the
presence of a σ symmetry 3c/3e– bond that
is delocalized across the entire metal-atom chain and forms the basis
of the heterometallic Mo2–M interaction. The delocalized
3c/3e– interaction is discussed within the context
of the analogous 3c/3e– π bonding in the vinoxy
radical, CH2CHO. The vinoxy comparison establishes three
predictions for the σ symmetry 3c/3e– bond
in HEMACS: (1) an umpolung effect that causes the
Mo–M interactions to become more covalent as Δχ
increases, (2) distortion of the σ bonding and non-bonding orbitals
to emphasize Mo–M bonding and de-emphasize Mo–Mo bonding,
and (3) an increase in Mo spin population with increasing Mo–M
covalency. In agreement with these predictions, we find that the Mo2···M covalency increases with increasing Δχ
of the Mo and M atoms (ΔχMo–M increases
as M = Cr < Mn < Fe < Co < Ni), an umpolung of the trend predicted in the absence of σ delocalization.
We attribute the observed trend in covalency to the decreased energic
differential (ΔE) between the heterometal orbital and the σ bonding molecular
orbital of the Mo2 quadruple bond, which serves as an energetically
stable, “ligand”-like electron-pair donor to the heterometal
ion acceptor. As M is changed from Cr to Ni, the σ bonding and
nonbonding orbitals do indeed distort as anticipated, and the spin
population of the outer Mo group is increased by at least a factor
of 2. These findings provide a predictive framework for multimetallic
compounds and advance the current understanding of the electronic
structures of molecular heteromultimetallic systems, which can be
extrapolated to applications in the context of mixed-metal surface
catalysis and multimetallic proteins. This
work describes how use of a metal−metal quadruply
bonded metalloligand can reverse expected trends in metal−metal
bond polarity through the preparation and systematic study of a novel
series of Mo2M(dpa)4(OTf)2 (M = Cr,
Mn, Fe, Co, and Ni) heterotrimetallic extended metal atom chain (HEMAC)
complexes. These complexes feature a 3c/3e− metal−metal
bond that is delocalized across the entire metal atom chain and is
compared to the 3c/3e− π bonding in the vinoxyl
radical.
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Affiliation(s)
- Amelia M Wheaton
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Jill A Chipman
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Michael D Roy
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - John F Berry
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706, United States
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9
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Kerru N, Maddila S, Jonnalagadda SB. Organo-catalysis as emerging tools in organic synthesis: aldol and Michael reactions. PHYSICAL SCIENCES REVIEWS 2022. [DOI: 10.1515/psr-2021-0023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Organocatalysis has occupied sustainable position in organic synthesis as a powerful tool for the synthesis of enantiomeric-rich compounds with multiple stereogenic centers. Among the various organic molecules for organocatalysis, the formation of carbon–carbon is viewed as a challenging issue in organic synthesis. The asymmetric aldol and Michael addition reactions are the most significant methods for C–C bond forming reactions. These protocols deliver a valuable path to access chiral molecules, which are useful synthetic hybrids in biologically potent candidates and desirable versatile pharmaceutical intermediates. This work highlighted the impact of organocatalytic aldol and Michael addition reactions in abundant solvent media. It focused on the crucial methods to construct valuable molecules with high enantio- and diastereo-selectivity.
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Affiliation(s)
- Nagaraju Kerru
- Department of Chemistry , GITAM School of Science, GITAM University , Bengaluru , Karnataka - 561203 , India
| | - Suresh Maddila
- Department of Chemistry , GITAM Institute of Sciences, GITAM University , Visakhapatnam , Andhra Pradesh , India
- School of Chemistry & Physics, University of KwaZulu-Natal , Westville Campus , Chiltern Hills , Durban - 4000 , South Africa
| | - Sreekantha B. Jonnalagadda
- School of Chemistry & Physics, University of KwaZulu-Natal , Westville Campus , Chiltern Hills , Durban - 4000 , South Africa
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10
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Leonardi C, Brandolese A, Preti L, Bortolini O, Polo E, Dambruoso P, Ragno D, Di Carmine G, Massi A. Expanding the Toolbox of Heterogeneous Asymmetric Organocatalysts: Bifunctional Cyclopropenimine Superbases for Enantioselective Catalysis in Batch and Continuous Flow. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100757] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Costanza Leonardi
- Department of Chemical, Pharmaceutical and Agricultural Sciences University of Ferrara Via L. Borsari 46 44121 Ferrara Italy
| | - Arianna Brandolese
- Department of Chemical, Pharmaceutical and Agricultural Sciences University of Ferrara Via L. Borsari 46 44121 Ferrara Italy
| | - Lorenzo Preti
- Department of Chemical, Pharmaceutical and Agricultural Sciences University of Ferrara Via L. Borsari 46 44121 Ferrara Italy
| | - Olga Bortolini
- Department of Chemical, Pharmaceutical and Agricultural Sciences University of Ferrara Via L. Borsari 46 44121 Ferrara Italy
| | - Eleonora Polo
- Istituto per la Sintesi Organica e la Fotoreattività Consiglio Nazionale delle Ricerche Via P. Gobetti, 101 40129 Bologna Italy
| | - Paolo Dambruoso
- Istituto per la Sintesi Organica e la Fotoreattività Consiglio Nazionale delle Ricerche Via P. Gobetti, 101 40129 Bologna Italy
| | - Daniele Ragno
- Department of Chemical, Pharmaceutical and Agricultural Sciences University of Ferrara Via L. Borsari 46 44121 Ferrara Italy
| | - Graziano Di Carmine
- Department of Chemical, Pharmaceutical and Agricultural Sciences University of Ferrara Via L. Borsari 46 44121 Ferrara Italy
| | - Alessandro Massi
- Department of Chemical, Pharmaceutical and Agricultural Sciences University of Ferrara Via L. Borsari 46 44121 Ferrara Italy
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11
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Catalytic conversion of CO2: Electrochemically to ethanol and thermochemically to cyclic carbonates using nanoporous polytriazine. J CO2 UTIL 2021. [DOI: 10.1016/j.jcou.2021.101676] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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12
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Bitai J, Westwood MT, Smith AD. α,β-Unsaturated acyl ammonium species as reactive intermediates in organocatalysis: an update. Org Biomol Chem 2021; 19:2366-2384. [PMID: 33650626 DOI: 10.1039/d0ob02208j] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
α,β-Unsaturated acyl ammonium species are versatile intermediates that have been applied in a variety of transformations including Michael additions, domino reactions and cycloadditions. Many of these transformations are promoted by chiral Lewis base catalysts, enabling the rapid generation of molecular complexity with high stereochemical control. This review highlights recent developments in the generation and application of α,β-unsaturated acyl ammonium intermediates reported since a previous review of this area in 2016. Particular emphasis will be placed on reports providing mechanistic insight into catalytic transformations and observed selectivities. A perspective on current challenges and potential future developments in the field of α,β-unsaturated acyl ammonium catalysis is also provided.
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Affiliation(s)
- Jacqueline Bitai
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, Fife, Scotland, KY16 9ST, UK.
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13
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Fanjul-Mosteirín N, del Amo V. Organocatalytic transformations in deep eutectic solvents: Green methodologies made greener. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.131967] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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14
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Giomi D, Ceccarelli J, Salvini A, Brandi A. Organocatalytic Reduction of Nitroarenes with Phenyl(2‐quinolyl)methanol. ChemistrySelect 2020. [DOI: 10.1002/slct.202003234] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Donatella Giomi
- Dipartimento di Chimica ‘Ugo Schiff' Università degli Studi di Firenze Via della Lastruccia 3–13 I-50019 Sesto Fiorentino (Fi) Italy
| | - Jacopo Ceccarelli
- Dipartimento di Chimica ‘Ugo Schiff' Università degli Studi di Firenze Via della Lastruccia 3–13 I-50019 Sesto Fiorentino (Fi) Italy
| | - Antonella Salvini
- Dipartimento di Chimica ‘Ugo Schiff' Università degli Studi di Firenze Via della Lastruccia 3–13 I-50019 Sesto Fiorentino (Fi) Italy
| | - Alberto Brandi
- Dipartimento di Chimica ‘Ugo Schiff' Università degli Studi di Firenze Via della Lastruccia 3–13 I-50019 Sesto Fiorentino (Fi) Italy
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15
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Hussein MA, Dinh AH, Huynh VT, Nguyen TV. Synthesis of tertiary amines by direct Brønsted acid catalyzed reductive amination. Chem Commun (Camb) 2020; 56:8691-8694. [PMID: 32613957 DOI: 10.1039/d0cc02955f] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Tertiary amines are ubiquitous and valuable compounds in synthetic chemistry, with a wide range of applications in organocatalysis, organometallic complexes, biological processes and pharmaceutical chemistry. One of the most frequently used pathways to synthesize tertiary amines is the reductive amination reaction of carbonyl compounds. Despite developments of numerous new reductive amination methods in the past few decades, this reaction generally requires non-atom-economic processes with harsh conditions and toxic transition-metal catalysts. Herein, we report simple yet practical protocols using triflic acid as a catalyst to efficiently promote the direct reductive amination reactions of carbonyl compounds on a broad range of substrates. Applications of this new method to generate valuable heterocyclic frameworks and polyamines are also included.
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Affiliation(s)
- Mohanad A Hussein
- School of Chemistry, University of New South Wales, Sydney, Australia.
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16
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Liu D, Wang J, Liu W, Zhang F, Zhou Y. Synthesis of Polycyclic Spiro Pyrrolidone Derivatives via DBU‐Catalyzed Diastereoselective Vinylogous Aldol‐Michael Cascade Reaction. ChemCatChem 2020. [DOI: 10.1002/cctc.202000463] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Dandan Liu
- Chemistry and Environment Engineering CollegePingdingshan University Pingdingshan 475000 P. R. China
| | - Jiansheng Wang
- Chemistry and Environment Engineering CollegePingdingshan University Pingdingshan 475000 P. R. China
| | - Wenqin Liu
- School of Chemistry Chemical Engineering and Life SciencesWuhan University of Technology Wuhan 430070 P. R. China
| | - Fang‐Lin Zhang
- School of Chemistry Chemical Engineering and Life SciencesWuhan University of Technology Wuhan 430070 P. R. China
| | - Yirong Zhou
- Hubei Key Laboratory of Natural Medicinal Chemistry and Resource Evaluation School of Pharmacy Tongji Medical CollegeHuazhong University of Science and Technology Wuhan 430030 P. R. China
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17
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De Risi C, Bortolini O, Brandolese A, Di Carmine G, Ragno D, Massi A. Recent advances in continuous-flow organocatalysis for process intensification. REACT CHEM ENG 2020. [DOI: 10.1039/d0re00076k] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The progresses on continuous-flow organocatalysis from 2016 to early 2020 are reviewed with focus on transition from batch to flow.
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Affiliation(s)
- Carmela De Risi
- Dipartimento di Scienze Chimiche e Farmaceutiche
- I-44121 Ferrara
- Italy
| | - Olga Bortolini
- Dipartimento di Scienze Chimiche e Farmaceutiche
- I-44121 Ferrara
- Italy
| | | | | | - Daniele Ragno
- Dipartimento di Scienze Chimiche e Farmaceutiche
- I-44121 Ferrara
- Italy
| | - Alessandro Massi
- Dipartimento di Scienze Chimiche e Farmaceutiche
- I-44121 Ferrara
- Italy
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18
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Sharma R, Bansal A, Ramachandran CN, Mohanty P. A multifunctional triazine-based nanoporous polymer as a versatile organocatalyst for CO2utilization and C–C bond formation. Chem Commun (Camb) 2019; 55:11607-11610. [DOI: 10.1039/c9cc04975d] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Conversion of CO2to cyclic carbonates, methanol and methane by using a nanoporous MNENP as a multifunctional metal-free organocatalyst.
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Affiliation(s)
- Ruchi Sharma
- Functional Materials Laboratory
- Department of Chemistry
- IIT Roorkee
- Roorkee-247667
- India
| | - Ankushi Bansal
- Functional Materials Laboratory
- Department of Chemistry
- IIT Roorkee
- Roorkee-247667
- India
| | - C. N. Ramachandran
- Theoretical and Computational Chemistry Laboratory
- Department of Chemistry
- IIT Roorkee
- India
| | - Paritosh Mohanty
- Functional Materials Laboratory
- Department of Chemistry
- IIT Roorkee
- Roorkee-247667
- India
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19
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Heshmat M. Unraveling the Origin of Solvent Induced Enantioselectivity in the Henry Reaction with Cinchona Thiourea as Catalyst. J Phys Chem A 2018; 122:7974-7982. [PMID: 30230831 DOI: 10.1021/acs.jpca.8b04589] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this work, we report an energy decomposition and electronic structure analysis using DFT calculations for the C-C coupling step in the Henry reaction with cinchona thiourea as catalyst and DMF solvent to unravel the origin of enantioselectivity. We found that the conformation of flexible thiourea moiety is affected by the solvent, and in the preferred conformation of thiourea in strong Lewis basic DMF solvent, the N-H sites are in the opposite direction, i.e., in trans conformation. Hence, the thiourea moiety acts via single hydrogen bonding with substrates. The conformation of the substrates with respect to the forming C-C bond plays critical role to increase orbital interaction between two substrates and enhances hydrogen bond strength between substrates and catalyst, which in turn stabilizes the positive charge developing on the catalyst at the transition state for one of the enantiomers ( S). Thus, the enantioselectivity has electronic structure origin. The stronger H-bond formation in the S enantiomer has been confirmed by the calculated IR spectra and is in agreement with thus far experimental and computational results.
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Affiliation(s)
- Mojgan Heshmat
- Department of Organic Chemistry , Stockholm University , Stockholm , 10691 , Sweden.,Theoretical Chemistry , Vrije Universiteit Amsterdam , De Boelelaan 1083 , 1081 HV Amsterdam , The Netherlands
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Khasiyatullina NR, Litvinov IA, Mironov VF. Reactions of Tertiary Phosphines with 3-Halogen-1,2-naphthoquinones as a New Synthetic Approach to 3,3′,4,4′-Tetrahydroxy-1,1′-binaphthyls. RUSS J GEN CHEM+ 2018. [DOI: 10.1134/s1070363218090074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Lunagariya J, Dhar A, Vekariya RL. Efficient esterification of n-butanol with acetic acid catalyzed by the Brönsted acidic ionic liquids: influence of acidity. RSC Adv 2017. [DOI: 10.1039/c6ra26722j] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
BAILs having different structures and their related acidities have been investigated for their role in the esterification of n-butanol with acetic acid, and it was found that IL-5 containing double –SO3H groups exhibits excellent catalytic activity.
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Affiliation(s)
- Jignesh Lunagariya
- Department of Chemistry
- College of Chemistry and Materials Science
- Jinan University
- Guangzhou 510632
- PR China
| | - Abhishek Dhar
- Department of Chemical Technology
- University of Calcutta
- Kolkata 700 009
- India
| | - Rohit L. Vekariya
- School of Chemical Engineering
- Fuzhou University
- Fuzhou 350116
- PR China
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