1
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Mondal M, Mani G. Copper(I) complexes bearing pyrrole-bridged S,N and N-donor ligands as catalysts for tandem hydroamination-alkynylation: effect of anions on product formation. Dalton Trans 2024; 53:13996-14010. [PMID: 39102056 DOI: 10.1039/d4dt01937g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/06/2024]
Abstract
In this study, the reaction between 2-(3,5-dimethylpyrazolylmethyl)-5-(dimethylaminomethyl)pyrrole and thiophenol under heating conditions afforded the new ligand 2-(3,5-dimethylpyrazolylmethyl)-5-(phenylthiomethyl)pyrrole 2. The reaction of 2 with meta-chloroperbenzoic acid provided sulfoxide 3 and sulfone 4 group-containing ligands. The reaction of 2 with copper(I) halides provided the binuclear complexes [Cu(μ-X){μ-C4H3N-2-(CH2Me2pz)-5-(CH2SPh)-κ2-S,N}]2 (X = Cl, Br and I, 5-7) in high yields. Conversely, the analogous reaction of 4 with copper(I) halides yielded two types of complexes, three coordinate bi- and mononuclear of the type [Cu(μ-Cl){C4H3N-2-(CH2Me2pz)-5-(CH2SO2Ph)-κ1-N}]28 and [CuX{C4H3N-2-(CH2Me2pz)-5-(CH2SO2Ph)-κ1-N}2], X = Br, 9 and I, 10. When the reaction was carried out in the presence of KPF6, the two-coordinate complex [Cu{C4H3N-2-(CH2Me2pz)-5-(CH2SO2Ph)-κ1-N}2]PF6-11a was isolated, whereas its BF4- analogue 11b was synthesized by the reaction of 8 with AgBF4. The structures of these complexes were determined using single-crystal X-ray crystallography. These copper complexes catalyzed the hydroamination-alkynylation reaction between several secondary amines and alkyl and aryl terminal alkynes. Using 1 mol% of complexes 5-10 as catalysts, both tri- and tetra-substituted propargylamines were isolated. Alternatively, phenylacetylene and different secondary amines afforded the corresponding trisubstituted propargylamines as the major products and alkyl terminal alkynes gave the tetrasubstituted products in excellent yields. In addition, the role of counter anions such as TfO-, PF6-, BF4-, PO43- and Ph4B- on the product selectivity was studied. When fluorinated anions such as TfO-, PF6-, and BF4- were present with the copper complexes, the hydroamination-hydrovinylation product 1-aminodiene 23 was observed, which was not formed with PO43-, Ph4B- or halide ions. Specifically, TfO- and PF6- favored the formation of 23, while BF4- favored the tetrasubstituted product as the major product. This was further supported by the isolated copper(I) complexes containing PF6- and BF4- and by other specific reactions. The peaks for enamines and [LCu]+ species in the HRMS spectra of the reaction mixtures and the isolation of the morpholinium copper(I) salt support the proposed mechanism.
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Affiliation(s)
- Munmun Mondal
- Department of Chemistry, Indian Institute of Technology, Kharagpur, 721 302, Kharagpur, India.
| | - Ganesan Mani
- Department of Chemistry, Indian Institute of Technology, Kharagpur, 721 302, Kharagpur, India.
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2
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Chen L, Zhou W, Zhang J, Ding Y, Szostak M, Liu C. Deoxygenative alkynylation of amides via CO bond cleavage. Chem Commun (Camb) 2024; 60:8454-8457. [PMID: 39037708 DOI: 10.1039/d4cc02316a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/23/2024]
Abstract
A novel deoxygenative alkynylation of amides promoted by a synergistic action of a divalent rare-earth element and a transition metal has been developed. In this method, α-alkynyl substituted amines are synthesized from unactivated amides and alkynes in a single transformation. Broad substrate scope and excellent selectivity for CO cleavage has been demonstrated. This approach represents a general method for the construction of versatile α-alkynyl substituted amines from unactivated amide bonds.
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Affiliation(s)
- Lan Chen
- Department of Chemistry, Shanghai University, 99 Shangda Road, Shanghai 200444, China.
| | - Wei Zhou
- Department of Chemistry, Shanghai University, 99 Shangda Road, Shanghai 200444, China.
| | - Jianwen Zhang
- Department of Chemistry, Shanghai University, 99 Shangda Road, Shanghai 200444, China.
| | - Yimin Ding
- Department of Chemistry, Shanghai University, 99 Shangda Road, Shanghai 200444, China.
| | - Michal Szostak
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, USA.
| | - Chengwei Liu
- Department of Chemistry, Shanghai University, 99 Shangda Road, Shanghai 200444, China.
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3
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Cotter E, Pultar F, Riniker S, Altmann KH. Experimental and Theoretical Studies on the Reactions of Aliphatic Imines with Isocyanates. Chemistry 2024; 30:e202304272. [PMID: 38226702 DOI: 10.1002/chem.202304272] [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: 12/21/2023] [Revised: 01/14/2024] [Accepted: 01/15/2024] [Indexed: 01/17/2024]
Abstract
In the context of a project aiming at the replacement of the 3-substituted β-lactam ring in classical β-lactam antibiotics by an N(3)-acyl-1,3-diazetidinone moiety, we have investigated the reaction of isocyanates with imines derived from allyl glycinate and differently substituted propionaldehydes. Imines of aromatic aldehydes with anilines have been reported to react with acyl isocyanates to give 1,3-diazetidinones or 2,3-dihydro-4H-1,3,5-oxadiazin-4-ones, via [2+2] or [4+2] cycloaddition, respectively. However, neither of these products was formed with imines derived from allyl glycinate and 2-(mono)methyl propionaldehydes. α,α-Dimethylation of the imine enabled the [4+2] cycloaddition pathway, but the desired 1,3-diazetidinone products were not observed. Surprisingly, the imines obtained from thioesters of 2,2-dimethyl 3-oxo propionic acid reacted with aryl isocyanates or with benzyl isocyanate to give 5,5-dimethyl-2,4-dioxo-6-(aryl-/alkylthio)tetrahydropyrimidines, via thiol displacement and re-addition to a putative six-membered iminium intermediate. These experimental results obtained for the reactions could be rationalized by DFT calculations. In addition, we have shown that N(3)-acyl-1,3-diazetidinone and 2,3-dihydro-4H-1,3,5-oxadiazin-4-one products can be distinguished based on experimental IR data in combination with theoretical reference spectra employing the IR spectra alignment (IRSA) algorithm. This discrimination was not possible by means of 1 H, 13 C, or 15 N NMR spectroscopy.
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Affiliation(s)
- Etienne Cotter
- Department of Chemistry and Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zürich, Vladimir-Prelog-Weg 4, 8093, Zürich, Switzerland
| | - Felix Pultar
- ETH Zürich, Department of Chemistry and Applied Biosciences, Institute of Molecular Physical Science, 8093, Zürich, Switzerland
| | - Sereina Riniker
- ETH Zürich, Department of Chemistry and Applied Biosciences, Institute of Molecular Physical Science, 8093, Zürich, Switzerland
| | - Karl-Heinz Altmann
- Department of Chemistry and Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zürich, Vladimir-Prelog-Weg 4, 8093, Zürich, Switzerland
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Shehzadi SA, Saeed A, Perveen F, Channar PA, Arshad I, Abbas Q, Kalsoom S, Yousaf S, Simpson J. Identification of two novel thiazolidin-2-imines as tyrosinase inhibitors: synthesis, crystal structure, molecular docking and DFT studies. Heliyon 2022; 8:e10098. [PMID: 36046526 PMCID: PMC9421195 DOI: 10.1016/j.heliyon.2022.e10098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 07/06/2022] [Accepted: 07/26/2022] [Indexed: 11/29/2022] Open
Abstract
Various N- and S-containing 5-membered heterocycles such as imidazole-2-thiones, thiazolidinones and thiazolidin-2-imines are among the most eminent biologically active organic heterocycles and are present in many marketed drugs. In view of their synthetic and biological significance, an efficient synthesis of two novel thiazolidine-2-imines (4a-b) utilizing a three-component one-pot approach starting from an aldimine, an alkyne and isothiocyanates has been developed. The reaction proceeded via a 5-exo digonal (5-exo dig) cyclization of a propargyl thiourea, formed in situ in the presence of Zn(II)-catalyst. The structures of the resulting products are elucidated by spectroscopic methods and X-ray crystallography. A DFT study explored the structural, thermodynamic and molecular electrostatic potential parameters for the compounds. The newly synthesized compounds (4a & 4b) were evaluated for the inhibition of tyrosinase both in vitro and in silico. The in vitro results revealed that the synthesized thiazolidine-2-imines (4a-b) showed good inhibition activity towards mushroom tyrosinase (IC50 = 1.151 ± 1.25 and 2.079 ± 0.87 μM respectively) in comparison to the kojic acid standard (IC50 = 16.031 ± 1.27 μM) a commonly used anti-pigment agent in plant and animal tissues. The experimental inhibition was further assessed by molecular docking studies between synthesized ligands and the human tyrosinase protein complex to investigate the intermolecular interactions responsible for tyrosinase inhibition activity.
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Affiliation(s)
- Syeda Aaliya Shehzadi
- Sulaiman Bin Abdullah Aba Al-Khail-Centre for Interdisciplinary Research in Basic Sciences (SA-CIRBS), International Islamic University, 44000 Islamabad, Pakistan
- Corresponding author.
| | - Aamer Saeed
- Department of Chemistry, Quaid-i-Azam University, 45320 Islamabad, Pakistan
| | - Fouzia Perveen
- Research Center for Modelling and Simulations (RCMS), National University of Sciences and Technology (NUST), H-12 Islamabad, Pakistan
| | | | - Ifzan Arshad
- Department of Chemistry, University of Management and Technology, Sialkot, Pakistan
- Corresponding author.
| | - Qamar Abbas
- Department of Physiology, University of Sindh, Jamshoro, Pakistan
| | - Saima Kalsoom
- Department of Chemistry, Preston University, Islamabad, Pakistan
| | - Sammer Yousaf
- H.E.J. Research Institute of Chemistry, International Center for Chemical and Biological Sciences, University of Karachi, 75270, Karachi, Pakistan
| | - Jim Simpson
- Department of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand
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5
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Schlimpen F, Plaçais C, Starck E, Bénéteau V, Pale P, Chassaing S. α-Tertiary Propargylamine Synthesis via KA 2-Type Coupling Reactions under Solvent-Free Cu I-Zeolite Catalysis. J Org Chem 2021; 86:16593-16613. [PMID: 34806367 DOI: 10.1021/acs.joc.1c01893] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The potential of copper(I)-zeolite catalysis was evaluated in the three-component KA2-coupling mediated synthesis of α-tertiary propargylamines. Our archetypal copper(I)-doped zeolite CuI-USY proved to be efficient under ligand- and solvent-free conditions at 80 °C. Usable up to four times, this catalytic material enables the coupling of diverse ketones, alkynes, and amines with a broad functional group tolerance. A decarboxylative and a desilylative version, respectively, involving an alkynoic acid and trimethylsilylacetylene as alkyne surrogates, was also set up to bypass selectivity issues and/or to access α-tertiary propargylamines that are unattainable under standard KA2 conditions. Interestingly, the KA2-type coupling reactions were successfully linked to other CuI-catalyzed reactions, thus resulting in sequential one-pot processes under full CuI-USY catalysis.
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Affiliation(s)
- Fabian Schlimpen
- Laboratoire de Synthèse, Réactivité Organique et Catalyse (LASYROC), Institut de Chimie, CNRS-UMR7177, Université de Strasbourg, 4 rue Blaise Pascal, Strasbourg 67070, France
| | - Clotilde Plaçais
- Laboratoire de Synthèse, Réactivité Organique et Catalyse (LASYROC), Institut de Chimie, CNRS-UMR7177, Université de Strasbourg, 4 rue Blaise Pascal, Strasbourg 67070, France
| | - Eliot Starck
- Laboratoire de Synthèse, Réactivité Organique et Catalyse (LASYROC), Institut de Chimie, CNRS-UMR7177, Université de Strasbourg, 4 rue Blaise Pascal, Strasbourg 67070, France
| | - Valérie Bénéteau
- Laboratoire de Synthèse, Réactivité Organique et Catalyse (LASYROC), Institut de Chimie, CNRS-UMR7177, Université de Strasbourg, 4 rue Blaise Pascal, Strasbourg 67070, France
| | - Patrick Pale
- Laboratoire de Synthèse, Réactivité Organique et Catalyse (LASYROC), Institut de Chimie, CNRS-UMR7177, Université de Strasbourg, 4 rue Blaise Pascal, Strasbourg 67070, France
| | - Stefan Chassaing
- Laboratoire de Synthèse, Réactivité Organique et Catalyse (LASYROC), Institut de Chimie, CNRS-UMR7177, Université de Strasbourg, 4 rue Blaise Pascal, Strasbourg 67070, France
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6
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Identification of a novel click-derived 1,2,3-triazole as selective Hg2+ ion detector: computational and experimental investigations. CHEMICAL PAPERS 2021. [DOI: 10.1007/s11696-021-01804-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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7
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Zorba LP, Vougioukalakis GC. The Ketone-Amine-Alkyne (KA2) coupling reaction: Transition metal-catalyzed synthesis of quaternary propargylamines. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213603] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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8
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Kundu S, Kayet A, Baidya R, Satyanarayana L, Maiti DK. Nanofibrils of a Cu II-Thiophenyltriazine-Based Porous Polymer: A Diverse Heterogeneous Nanocatalyst. ACS OMEGA 2020; 5:394-405. [PMID: 31956787 PMCID: PMC6964281 DOI: 10.1021/acsomega.9b02904] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2019] [Accepted: 11/15/2019] [Indexed: 06/10/2023]
Abstract
Herein, we report knitting of a thiophenyltriazine-based porous organic polymer (TTPOP) with high surface area and high abundance of nitrogen and sulfur sites, synthesized through a simple one-step Friedel-Crafts reaction of 2,4,6-tri(thiophen-2-yl)-1,3,5-triazine and formaldehyde dimethyl acetal in the presence of anhydrous FeCl3, and thereafter grafting of Cu(OAc)2·H2O in the porous polymer framework to achieve the potential catalyst (CuII-TTPOP). TTPOP and CuII-TTPOP were characterized thoroughly utilizing solid-state 13C-CP MAS NMR, Fourier transform infrared, wide-angle powder X-ray diffraction, thermogravimetric analysis, and X-ray photoelectron spectroscopy and surface imaging by transmission electron microscopy and field emission scanning electron microscopy. The porosity of the nanomaterials was observed in the surface imaging and verified through conducting N2 gas adsorption techniques. Keeping in mind the tremendous importance of C-C and C-N coupling and cyclization processes, the newly synthesized CuII-TTPOP was employed successfully for a wide range of organic catalytic transformations under mild conditions to afford directly valuable diindolylmethanes and spiro-analogues, phthalimidines, propargyl amines, and their sugar-based chiral compounds with high yields using readily available substrates. The highly stable new heterogeneous catalyst showed outstanding sustainability, robustness, simple separation, and recyclability.
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Affiliation(s)
- Sudipta
K. Kundu
- Department
of Chemistry, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India
| | - Anirban Kayet
- Department
of Chemistry, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India
| | - Ramlal Baidya
- Department
of Chemistry, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India
| | - Lanka Satyanarayana
- Analytical
Department, CSIR-Indian Institute of Chemical
Technology, Uppal Road, Hyderabad 500007, India
| | - Dilip K. Maiti
- Department
of Chemistry, University of Calcutta, 92 A.P.C. Road, Kolkata 700009, India
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9
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Mao ZY, Liu YW, Ma RJ, Ye JL, Si CM, Wei BG, Lin GQ. Divergent synthesis of N-heterocyclic 1,6-enynes through a zinc-catalyzed decarboxylative A 3 reaction. Chem Commun (Camb) 2019; 55:14170-14173. [PMID: 31701971 DOI: 10.1039/c9cc06985b] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A zinc-catalyzed decarboxylative A3 reaction of cyclic amino acids, α,β-unsaturated aldehydes and terminal alkynes has been developed. A series of functionalized N-heterocyclic 1,6-enynes have been successfully obtained with excellent regioselectivities through this novel approach. In addition, the utility of this straightforward process is demonstrated by the preparation of a polycyclic nitrogen-containing heterocyclic compound.
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Affiliation(s)
- Zhuo-Ya Mao
- Department of Natural Medicine, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China.
| | - Yi-Wen Liu
- Department of Natural Medicine, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China.
| | - Rui-Jun Ma
- Department of Natural Medicine, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China.
| | - Jian-Liang Ye
- College of Chemistry and Chemical Engineering and the Key Laboratory for Chemical Biology of Fujian Province, Xiamen University, Xiamen 361005, China
| | - Chang-Mei Si
- Department of Natural Medicine, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China.
| | - Bang-Guo Wei
- Department of Natural Medicine, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China.
| | - Guo-Qiang Lin
- Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, China
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10
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Chen H, Huang YH, Ye JL, Huang PQ. Double Addition of Alkynyllithium Reagents to Amides/Lactams: A Direct and Flexible Synthesis of 3-Amino-1,4-diynes Bearing an Aza-Quaternary Carbon Center. J Org Chem 2019; 84:9270-9281. [PMID: 31287315 DOI: 10.1021/acs.joc.9b01416] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient and mild protocol for the direct and flexible synthesis of 3-amino-1,4-diynes bearing an aza-quaternary carbon from tertiary amides and lactams has been established. The one-pot method consists of in situ activation of amides with trifluoromethanesulfonic anhydride, followed by double addition of alkynyllithium reagents at a concentration of 0.5 mol·L-1 in dichloromethane. This constitutes an extension of the method of direct reductive bisalkylation of amides that allows both employing alkynyllithium reagents as the first-addition nucleophiles and incorporating an alkynyl group as the first-introduced group.
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Affiliation(s)
- Hang Chen
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen , Fujian 361005 , P. R. China
| | - Ying-Hong Huang
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen , Fujian 361005 , P. R. China
| | - Jian-Liang Ye
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen , Fujian 361005 , P. R. China
| | - Pei-Qiang Huang
- Department of Chemistry, Fujian Provincial Key Laboratory of Chemical Biology, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen , Fujian 361005 , P. R. China
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11
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Tzouras N, Neofotistos SP, Vougioukalakis GC. Zn-Catalyzed Multicomponent KA 2 Coupling: One-Pot Assembly of Propargylamines Bearing Tetrasubstituted Carbon Centers. ACS OMEGA 2019; 4:10279-10292. [PMID: 31460120 PMCID: PMC6648923 DOI: 10.1021/acsomega.9b01387] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Accepted: 05/23/2019] [Indexed: 05/20/2023]
Abstract
Tetrasubstituted propargylamines comprise a unique class of highly useful compounds, which can be accessed through the multicomponent coupling between ketones, amines, and alkynes (KA2 coupling), an underexplored transformation. Herein, the development of a novel, highly efficient, and user-friendly catalytic system for the KA2 coupling, based on the environmentally benign, inexpensive, and readily available zinc acetate, is described. This system is employed in the multicomponent assembly of unprecedented, tetrasubstituted propargylamines derived from structurally diverse, challenging, and even biorelevant substrates. Notable features of this protocol include the demonstration of the enhancing effect that neat conditions can have on catalytic activity, as well as the expedient functionalization of hindered, prochiral cyclohexanones, linear ketones, and interesting molecular scaffolds such as norcamphor and nornicotine.
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12
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Liu C, Wang G, Wang Y, Pereshivko OP, Peshkov VA. Copper-Catalyzed Reaction of Secondary Propargylamines with Ethyl Buta-2,3-dienoate for the Synthesis of 1,6-Dihydropyridines. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801227] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Chao Liu
- College of Chemistry; Chemical Engineering and Materials Science; Soochow University; Dushu Lake Campus 215123 Suzhou P. R. China
| | - Gaigai Wang
- College of Chemistry; Chemical Engineering and Materials Science; Soochow University; Dushu Lake Campus 215123 Suzhou P. R. China
| | - Yuqing Wang
- College of Chemistry; Chemical Engineering and Materials Science; Soochow University; Dushu Lake Campus 215123 Suzhou P. R. China
| | - Olga P. Pereshivko
- College of Chemistry; Chemical Engineering and Materials Science; Soochow University; Dushu Lake Campus 215123 Suzhou P. R. China
| | - Vsevolod A. Peshkov
- College of Chemistry; Chemical Engineering and Materials Science; Soochow University; Dushu Lake Campus 215123 Suzhou P. R. China
- Department of Chemistry; School of Science and Technology; Nazarbayev University; 53 Kabanbay Batyr Ave, Block 7 010000 Astana Republic of Kazakhstan
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13
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Bidusenko IA, Schmidt EY, Ushakov IA, Trofimov BA. Transition-Metal-Free Addition of Acetylenes to Ketimines: the First Base-Catalyzed Ethynylation of the C=N Bond. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800850] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Ivan A. Bidusenko
- A. E. Favorsky Irkutsk Institute of Chemistry; Siberian Branch of Russian Academy of Sciences; 1 Favorsky Str. 664033 Irkutsk Russia
| | - Elena Yu. Schmidt
- A. E. Favorsky Irkutsk Institute of Chemistry; Siberian Branch of Russian Academy of Sciences; 1 Favorsky Str. 664033 Irkutsk Russia
| | - Igor A. Ushakov
- A. E. Favorsky Irkutsk Institute of Chemistry; Siberian Branch of Russian Academy of Sciences; 1 Favorsky Str. 664033 Irkutsk Russia
| | - Boris A. Trofimov
- A. E. Favorsky Irkutsk Institute of Chemistry; Siberian Branch of Russian Academy of Sciences; 1 Favorsky Str. 664033 Irkutsk Russia
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14
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Shehzadi SA, Vande Velde CML, Saeed A, Abbaspour Tehrani K. Synthesis of highly functionalized 1,6-dihydropyridines via the Zn(OTf)2-catalyzed three-component cascade reaction of aldimines and two alkynes (IA2-coupling). Org Biomol Chem 2018; 16:3241-3247. [DOI: 10.1039/c8ob00195b] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
One pot Zn(ii)-catalyzed imine–alkyne–alkyne coupling.
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Affiliation(s)
| | | | - Aamer Saeed
- Department of Chemistry
- Quaid-I-Azam University
- Islamabad 45320
- Pakistan
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