1
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Eleuteri M, Desantis J, Cruciani G, Germani R, Goracci L. Use of ionic liquids in amidation reactions for proteolysis targeting chimera synthesis. Org Biomol Chem 2024; 22:3477-3489. [PMID: 38602033 DOI: 10.1039/d4ob00304g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
Selective degradation of disease-causing proteins using proteolysis targeting chimeras (PROTACs) has gained great attention, thanks to its several advantages over traditional therapeutic modalities. Despite the advances made so far, the structural chemical complexity of PROTACs poses challenges in their synthetic approaches. PROTACs are typically prepared through a convergent approach, first synthesizing two fragments separately (target protein and E3 ligase ligands) and then coupling them to produce a fully assembled PROTAC. The amidation reaction represents the most common coupling exploited in PROTACs synthesis. Unfortunately, the overall isolated yields of such synthetic procedures are usually low due to one or more purification steps to obtain the final PROTAC with acceptable purity. In this work, we focused our attention on the optimization of the final amidation step for the synthesis of an anti-SARS-CoV-2 PROTAC by investigating different amidation coupling reagents and a range of alternative solvents, including ionic liquids (ILs). Among the ILs screened, [OMIM][ClO4] emerged as a successful replacement for the commonly used DMF within the HATU-mediated amidation reaction, thus allowing the synthesis of the target PROTAC under mild and sustainable conditions in very high isolated yields. With the optimised conditions in hand, we explored the scalability of the synthetic approach and the substrate scope of the reaction by employing different E3 ligase ligand (VHL and CRBN)-based intermediates containing linkers of different lengths and compositions or by using different target protein ligands. Interestingly, in all cases, we obtained high isolated yields and complete conversion in short reaction times.
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Affiliation(s)
- Michela Eleuteri
- Department of Chemistry, Biology, and Biotechnology, University of Perugia, Italy.
| | - Jenny Desantis
- Department of Chemistry, Biology, and Biotechnology, University of Perugia, Italy.
| | - Gabriele Cruciani
- Department of Chemistry, Biology, and Biotechnology, University of Perugia, Italy.
| | - Raimondo Germani
- Department of Chemistry, Biology, and Biotechnology, University of Perugia, Italy.
| | - Laura Goracci
- Department of Chemistry, Biology, and Biotechnology, University of Perugia, Italy.
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2
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Paparakis A, Turnell-Ritson RC, Sapsford JS, Ashley AE, Hulla M. Tin-catalyzed reductive coupling of amines with CO 2 and H 2. Catal Sci Technol 2023. [DOI: 10.1039/d2cy01659a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Tin-based FLPs catalyze reductive coupling reactions of amines with CO2 and H2. Water produced by the reaction is well tolerated and TONs up to 300 can be achieved.
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Affiliation(s)
- Alexandros Paparakis
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Prague 128 00, Czech Republic
| | | | - Joshua S. Sapsford
- Department of Chemistry, White City Campus, Imperial College London, London W12 0BZ, UK
| | - Andrew E. Ashley
- Department of Chemistry, White City Campus, Imperial College London, London W12 0BZ, UK
| | - Martin Hulla
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Prague 128 00, Czech Republic
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3
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Can CO2 be a catalyst? Yes, CO2-catalyzed N-formylation of aliphatic amines with DMF. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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4
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Das K, Majumdar S. Dual Activation of Carboxylic Acid Functionality by Protic Ionic Liquid: Solvent and Metal Free Strategy for Selective Esterification of Alcohols and Acylation of Aromatic Amines. ChemistrySelect 2022. [DOI: 10.1002/slct.202200937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Kamal Das
- Department of Chemistry Tripura University Suryamaninagar 799 022 INDIA
| | - Swapan Majumdar
- Department of Chemistry Tripura University Suryamaninagar 799 022 INDIA
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5
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Jiang J, Li L, Zhang L, Chen Q, Sun H, Liao S, Li C, Zhang L. Organophosphoric Acid Promoted Transamidation: Using
N
,
N
‐Dimethylformamide and
N
,
N
‐Dimethylacetamide as the Acyl Sources. ChemistrySelect 2021. [DOI: 10.1002/slct.202103932] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jian Jiang
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmaceutical Sciences Guizhou Medical University 550004 Guiyang China
| | - Linlin Li
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmaceutical Sciences Guizhou Medical University 550004 Guiyang China
| | - Ling Zhang
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmaceutical Sciences Guizhou Medical University 550004 Guiyang China
| | - Qian Chen
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmaceutical Sciences Guizhou Medical University 550004 Guiyang China
| | - Hao Sun
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmaceutical Sciences Guizhou Medical University 550004 Guiyang China
| | - Shanggao Liao
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmaceutical Sciences Guizhou Medical University 550004 Guiyang China
| | - Chun Li
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmaceutical Sciences Guizhou Medical University 550004 Guiyang China
| | - Lin Zhang
- State Key Laboratory of Functions and Applications of Medicinal Plants & School of Pharmaceutical Sciences Guizhou Medical University 550004 Guiyang China
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6
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Vigneswari, S., Sukarman, M. H., Ariffin, F.. Preliminary study on thiamethoxam degrading bacteria isolated from corn plantation. MALAYSIAN JOURNAL OF MICROBIOLOGY 2021. [DOI: 10.1007/s11164-016-2631-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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7
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Mezzetta A, Guglielmero L, Mero A, Tofani G, D’Andrea F, Pomelli CS, Guazzelli L. Expanding the Chemical Space of Benzimidazole Dicationic Ionic Liquids. Molecules 2021; 26:4211. [PMID: 34299487 PMCID: PMC8303995 DOI: 10.3390/molecules26144211] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Revised: 07/08/2021] [Accepted: 07/09/2021] [Indexed: 11/18/2022] Open
Abstract
Benzimidazole dicationic ionic liquids (BDILs) have not yet been widely explored in spite of their potential. Therefore, two structurally related families of BDILs, paired with either bromide or bistriflimide anions and bearing alkyl spacers ranging from C3 to C6, have been prepared. Their thermal properties have been studied by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), while their electrical properties have been assessed by cyclic voltammetry (CV). TG analysis confirmed the higher stability of the bistriflimide BDILs over the bromide BDILs, with minor variation within the two families. Conversely, DSC and CV allowed for ascertaining the role played by the spacer length. In particular, the thermal behavior changed dramatically among the members of the bistriflimide family, and all three possible thermal behavior types of ILs were observed. Furthermore, cyclic voltammetry showed different electrochemical window (C3(C1BenzIm)2/2Tf2N < C4(C1BenzIm)2/2Tf2N, C5(C1BenzIm)2/2Tf2N < C6(C1BenzIm)2/2Tf2N) as well as a reduction peak potential, shape, and intensity as a function of the spacer length. The results obtained highlight the benefit of accessing a more structurally diverse pool of compounds offered by dicationic ILs when compared to the parent monocationic ILs. In particular, gains are to be found in the ease of fine-tuning their properties, which translates in facilitating further investigations toward BDILs as designer solvents and catalysts.
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Affiliation(s)
- Andrea Mezzetta
- Department of Pharmacy, University of Pisa, Via Bonanno 33, 56126 Pisa, Italy; (L.G.); (A.M.); (G.T.); (F.D.); (C.S.P.); (L.G.)
| | - Luca Guglielmero
- Department of Pharmacy, University of Pisa, Via Bonanno 33, 56126 Pisa, Italy; (L.G.); (A.M.); (G.T.); (F.D.); (C.S.P.); (L.G.)
- DESTEC, University of Pisa, Largo Lucio Lazzarino, 56122 Pisa, Italy
| | - Angelica Mero
- Department of Pharmacy, University of Pisa, Via Bonanno 33, 56126 Pisa, Italy; (L.G.); (A.M.); (G.T.); (F.D.); (C.S.P.); (L.G.)
| | - Giorgio Tofani
- Department of Pharmacy, University of Pisa, Via Bonanno 33, 56126 Pisa, Italy; (L.G.); (A.M.); (G.T.); (F.D.); (C.S.P.); (L.G.)
- Department of Physics, University of Pisa, Largo Bruno Pontecorvo 3, 56127 Pisa, Italy
| | - Felicia D’Andrea
- Department of Pharmacy, University of Pisa, Via Bonanno 33, 56126 Pisa, Italy; (L.G.); (A.M.); (G.T.); (F.D.); (C.S.P.); (L.G.)
| | - Christian Silvio Pomelli
- Department of Pharmacy, University of Pisa, Via Bonanno 33, 56126 Pisa, Italy; (L.G.); (A.M.); (G.T.); (F.D.); (C.S.P.); (L.G.)
| | - Lorenzo Guazzelli
- Department of Pharmacy, University of Pisa, Via Bonanno 33, 56126 Pisa, Italy; (L.G.); (A.M.); (G.T.); (F.D.); (C.S.P.); (L.G.)
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8
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Amirsoleimani M, Khalilzadeh MA, Zareyee D. Preparation and catalytic evaluation of a palladium catalyst deposited over modified clinoptilolite (Pd@MCP) for chemoselective N-formylation and N-acylation of amines. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2020.129076] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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9
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Nano-sized clinoptilolite as a green catalyst for the rapid and chemoselective N-formylation of amines. REACTION KINETICS MECHANISMS AND CATALYSIS 2020. [DOI: 10.1007/s11144-020-01886-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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10
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Kardooni R, Kiasat AR. Polyethylene Glycol as a Green and Biocompatible Reaction Media for the Catalyst Free Synthesis of Organic Compounds. CURR ORG CHEM 2020. [DOI: 10.2174/1385272824999200605161840] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Replacing harmful organic solvents that caused environmental pollution with an alternative medium for the development of ideal synthetic strategies is one of the primary focal points of green chemistry. Utilizing polyethylene glycol (PEG) as a nonvolatile solvent and promotor for the evaluation of safe processes has made a considerable contribution to the reduction of pollution problems. The current review summarizes the recent well-known catalyst-free organic reaction performed in polyethylene glycol as a green and biocompatible reaction medium.
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Affiliation(s)
- Rezvan Kardooni
- Chemistry Department, College of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
| | - Ali Reza Kiasat
- Chemistry Department, College of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
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11
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Ma J, Zhang J, Zhou X, Wang J, Gong H. N-formylation of amine using graphene oxide as a sole recyclable metal-free carbocatalyst. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2018. [DOI: 10.1007/s13738-018-1471-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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12
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Kazemi S, Mobinikhaledi A, Zendehdel M. NaY zeolite functionalized by sulfamic acid/Cu(OAc) 2 as a new and reusable heterogeneous hybrid catalyst for efficient solvent-free formylation of amines. CHINESE CHEM LETT 2017. [DOI: 10.1016/j.cclet.2017.04.029] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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13
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Kamble VT, Bondle GM, Pisal PM. Ultrasonic promoted catalyst-free N-formylation of amines in neutral ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate. ARAB J CHEM 2017. [DOI: 10.1016/j.arabjc.2013.09.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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14
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Gajengi AL, Sasaki T, Bhanage BM. Mechanistic aspects of formation of MgO nanoparticles under microwave irradiation and its catalytic application. ADV POWDER TECHNOL 2017. [DOI: 10.1016/j.apt.2017.02.004] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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15
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Garkoti C, Shabir J, Mozumdar S. An imidazolium based ionic liquid supported on Fe3O4@SiO2 nanoparticles as an efficient heterogeneous catalyst for N-formylation of amines. NEW J CHEM 2017. [DOI: 10.1039/c6nj03985e] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An ionic liquid supported on silica-coated ferrite nanoparticles as an efficient and reusable catalyst for N-formylation of amines.
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Affiliation(s)
- Charu Garkoti
- Department of Chemistry
- University of Delhi
- Delhi
- India
| | - Javaid Shabir
- Department of Chemistry
- University of Delhi
- Delhi
- India
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16
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Dine TME, Evans D, Rouden J, Blanchet J. Formamide Synthesis through Borinic Acid Catalysed Transamidation under Mild Conditions. Chemistry 2016; 22:5894-8. [DOI: 10.1002/chem.201600234] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Tharwat Mohy El Dine
- Laboratoire de Chimie Moléculaire et Thio-organique, ENSICAEN et, Université de Caen Basse-Normandie, CNRS, 6 bd du Maréchal Juin, 14050, Caen, France
| | - David Evans
- Laboratoire de Chimie Moléculaire et Thio-organique, ENSICAEN et, Université de Caen Basse-Normandie, CNRS, 6 bd du Maréchal Juin, 14050, Caen, France
| | - Jacques Rouden
- Laboratoire de Chimie Moléculaire et Thio-organique, ENSICAEN et, Université de Caen Basse-Normandie, CNRS, 6 bd du Maréchal Juin, 14050, Caen, France
| | - Jérôme Blanchet
- Laboratoire de Chimie Moléculaire et Thio-organique, ENSICAEN et, Université de Caen Basse-Normandie, CNRS, 6 bd du Maréchal Juin, 14050, Caen, France.
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17
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Thale PB, Borase PN, Shankarling GS. Transamidation catalysed by a magnetically separable Fe3O4 nano catalyst under solvent-free conditions. RSC Adv 2016. [DOI: 10.1039/c6ra07149j] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Transamidation catalysed by magnetically separable Fe3O4 nano catalyst under solvent-free condition.
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Affiliation(s)
- Pranila B. Thale
- Dyestuff Technology Department
- Institute of Chemical Technology
- Mumbai 400019
- India
| | - Pravin N. Borase
- Dyestuff Technology Department
- Institute of Chemical Technology
- Mumbai 400019
- India
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18
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Greaves TL, Drummond CJ. Protic Ionic Liquids: Evolving Structure-Property Relationships and Expanding Applications. Chem Rev 2015; 115:11379-448. [PMID: 26426209 DOI: 10.1021/acs.chemrev.5b00158] [Citation(s) in RCA: 513] [Impact Index Per Article: 57.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Tamar L Greaves
- School of Applied Sciences, College of Science, Engineering and Health, RMIT University , GPO Box 2476, Melbourne, Victoria 3001, Australia
| | - Calum J Drummond
- School of Applied Sciences, College of Science, Engineering and Health, RMIT University , GPO Box 2476, Melbourne, Victoria 3001, Australia
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19
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Kooti M, Nasiri E. Phosphotungstic acid supported on silica-coated CoFe2O4 nanoparticles: An efficient and magnetically-recoverable catalyst for N-formylation of amines under solvent-free conditions. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcata.2015.05.009] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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20
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Majumdar S, Chakraborty M, Pramanik N, Maiti DK. Grindstone chemistry: protic ionic liquid-substrate tuned green synthesis of 1,2-disubstituted and 2-substituted benzimidazoles with outstanding selectivity. RSC Adv 2015. [DOI: 10.1039/c5ra08183a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An environmentally benign and highly substrate-protic ionic liquid controlled synthesis of 1,2-disubstituted and 2-substituted benzimidazoles with outstanding selectivity is demonstrated through grinding a mixture of OPD, aldehydes and catalyst.
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Affiliation(s)
- Swapan Majumdar
- Department of Chemistry
- Tripura University
- Suryamaninagar-799 022
- India
| | | | | | - Dilip K. Maiti
- Department of Chemistry
- University of Calcutta
- Kolkata-700 009
- India
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21
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Satasia SP, Kalaria PN, Raval DK. Heteropolyanion-based sulfated ionic liquid catalyzed formamides synthesis by grindstone chemistry. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.molcata.2014.04.005] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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22
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An efficient method for the synthesis of formamidine and formamide derivatives promoted by sulfonated rice husk ash (RHA-SO3H). JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2014. [DOI: 10.1007/s13738-014-0500-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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23
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Srivani A, Parameswaram G, Sai Prasad PS, Lingaiah N. Metal exchanged heteropolytungstate: an efficient catalyst for the synthesis of formylated amines. REACTION KINETICS MECHANISMS AND CATALYSIS 2014. [DOI: 10.1007/s11144-014-0702-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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24
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Chen Z, Fu R, Chai W, Zheng H, Sun L, Lu Q, Yuan R. An eco-benign and highly efficient procedure for N-acylation catalyzed by heteropolyanion-based ionic liquids using carboxylic acid under solvent-free conditions. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.02.042] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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25
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Lundberg H, Tinnis F, Selander N, Adolfsson H. Catalytic amide formation from non-activated carboxylic acids and amines. Chem Soc Rev 2014; 43:2714-42. [PMID: 24430887 DOI: 10.1039/c3cs60345h] [Citation(s) in RCA: 413] [Impact Index Per Article: 41.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The amide functionality is found in a wide variety of biological and synthetic structures such as proteins, polymers, pesticides and pharmaceuticals. Due to the fact that synthetic amides are still mainly produced by the aid of coupling reagents with poor atom-economy, the direct catalytic formation of amides from carboxylic acids and amines has become a field of emerging importance. A general, efficient and selective catalytic method for this transformation would meet well with the increasing demands for green chemistry procedures. This review covers catalytic and synthetically relevant methods for direct condensation of carboxylic acids and amines. A comprehensive overview of homogeneous and heterogeneous catalytic methods is presented, covering biocatalysts, Lewis acid catalysts based on boron and metals as well an assortment of other types of catalysts.
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Affiliation(s)
- Helena Lundberg
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, 106 91, Stockholm, Sweden.
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26
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Wang Y, Wang F, Zhang C, Zhang J, Li M, Xu J. Transformylating amine with DMF to formamide over CeO2 catalyst. Chem Commun (Camb) 2014; 50:2438-41. [DOI: 10.1039/c3cc48400a] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Majumdar S, De J, Chakraborty A, Maiti DK. General solvent-free highly selective N-tert-butyloxycarbonylation strategy using protic ionic liquid as an efficient catalyst. RSC Adv 2014. [DOI: 10.1039/c4ra02670e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
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28
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Wang ZG, Lu M. Highly efficient N-formylation of amines with ammonium formate catalyzed by nano-Fe3O4in PEG-400. RSC Adv 2014. [DOI: 10.1039/c3ra43273d] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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29
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Majumdar S, Chakraborty M, Maiti DK, Chowdhury S, Hossain J. Activation of 1,3-dioxolane by a protic ionic liquid in aqueous media: a green strategy for the selective hydrolytic cleavage of acetals and ketals. RSC Adv 2014. [DOI: 10.1039/c4ra00870g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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30
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Baghbanian SM, Farhang M. Protic [TBD][TFA] ionic liquid as a reusable and highly efficient catalyst for N-formylation of amines using formic acid under solvent-free condition. J Mol Liq 2013. [DOI: 10.1016/j.molliq.2013.04.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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31
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Lanigan RM, Starkov P, Sheppard TD. Direct synthesis of amides from carboxylic acids and amines using B(OCH2CF3)3. J Org Chem 2013; 78:4512-23. [PMID: 23586467 PMCID: PMC3671500 DOI: 10.1021/jo400509n] [Citation(s) in RCA: 167] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
![]()
B(OCH2CF3)3, prepared from readily
available B2O3 and 2,2,2-trifluoroethanol, is
as an effective reagent for the direct amidation of a variety of carboxylic
acids with a broad range of amines. In most cases, the amide products
can be purified by a simple filtration procedure using commercially
available resins, with no need for aqueous workup or chromatography.
The amidation of N-protected amino acids with both
primary and secondary amines proceeds effectively, with very low levels
of racemization. B(OCH2CF3)3 can
also be used for the formylation of a range of amines in good to excellent
yield, via transamidation of dimethylformamide.
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Affiliation(s)
- Rachel M Lanigan
- Department of Chemistry, University College London, Christopher Ingold Laboratories, 20 Gordon St, London, WC1H 0AJ, UK
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