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Singh J, Sharma S, Prakasham AP, Rajaraman G, Ghosh P. Accessing Bioactive Hydrazones by the Hydrohydrazination of Terminal Alkynes Catalyzed by Gold(I) Acyclic Aminooxy Carbene Complexes and Their Gold(I) Arylthiolato and Gold(III) Tribromo Derivatives: A Combined Experimental and Computational Study. ACS OMEGA 2023; 8:21042-21073. [PMID: 37323414 PMCID: PMC10268297 DOI: 10.1021/acsomega.3c01925] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 05/05/2023] [Indexed: 06/17/2023]
Abstract
Hydrohydrazination of terminal alkynes with hydrazides yielding hydrazones 5-14 were successfully catalyzed by a series of gold(I) acyclic aminooxy carbene complexes of the type [{(4-R2-2,6-t-Bu2-C6H2O)(N(R1)2)}methylidene]AuCl, where R2 = H, R1 = Me (1b); R2 = H, R1 = Cy (2b); R2 = t-Bu, R1 = Me (3b); R2 = t-Bu, R1 = Cy (4b). The mass spectrometric evidence corroborated the existence of the catalytically active solvent-coordinated [(AAOC)Au(CH3CN)]SbF6 (1-4)A species and the acetylene-bound [(AAOC)Au(HC≡CPhMe)]SbF6 (3B) species of the proposed catalysis cycle. The hydrohydrazination reaction was successfully employed in synthesizing several bioactive hydrazone compounds (15-18) with anticonvulsant properties using a representative precatalyst (2b). The DFT studies favored the 4-ethynyltoluene (HC≡CPhMe) coordination pathway over the p-toluenesulfonyl hydrazide (NH2NHSO2C6H4CH3) coordination pathway, and that proceeded by a crucial intermolecular hydrazide-assisted proton transfer step. The gold(I) complexes (1-4)b were synthesized from the {[(4-R2-2,6-t-Bu2-C6H2O)(N(R1)2)]CH}+OTf- (1-4)a by treatment with (Me2S)AuCl in the presence of NaH as a base. The reactivity studies of (1-4)b yielded the gold(III) [{(4-R2-2,6-t-Bu2-C6H2O)(N(R1)2)}methylidene]AuBr3 (1-4)c complexes upon reaction with molecular bromine and the gold(I) perfluorophenylthiolato derivatives, [{(4-R2-2,6-t-Bu2-C6H2O)(N(R1)2)}methylidene]AuSC6F5 (1-4)d, upon treatment with C6F5SH.
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2
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Dey S, Ghosh P. Accessing Heteroannular Benzoxazole and Benzimidazole Scaffolds via Carbodiimides Using Azide-Isocyanide Cross-Coupling as Catalyzed by Mesoionic Singlet Palladium Carbene Complexes Derived from a Phenothiazine Moiety. ACS OMEGA 2023; 8:11039-11064. [PMID: 37008148 PMCID: PMC10061513 DOI: 10.1021/acsomega.2c07875] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Accepted: 02/23/2023] [Indexed: 06/19/2023]
Abstract
The coupling of aryl and aliphatic azides with isocyanides yielding carbodiimides (8-17) were efficiently catalyzed by well-defined structurally characterized trans-(MIC)PdI2(L) [MIC = 1-CH2Ph-3-Me-4-(CH2N(C6H4)2S)-1,2,3-triazol-5-ylidene, L = NC5H5 (4), MesNC (5)], trans-(MIC)2PdI2 (6), and cis-(MIC)Pd(PPh3)I2 (7) type palladium complexes, which incidentally mark the first instances of the use of mesoionic singlet palladium carbene complexes for the said application. As observed from the product yields, the catalytic activity varied in the order 4 > 5 ∼ 6 > 7 for these complexes. A detailed mechanistic studies indicated that the catalysis proceeded via a palladium(0) (4a-7 a) species. Using a representative palladium precatalyst (4), the azide-isocyanide coupling was successfully extended to synthesizing two different bioactive heteroannular benzoxazole (18-22) and benzimidazole (23-27) derivatives, thereby broadening the scope of the catalytic application.
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Affiliation(s)
- Shreyata Dey
- Department
of Chemistry Indian Institute of Technology
Bombay Powai, Mumbai 400 076, India
| | - Prasenjit Ghosh
- Department
of Chemistry Indian Institute of Technology
Bombay Powai, Mumbai 400 076, India
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3
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Selmi A, Said K, Nasri S, Tachoua W. Crystal Structure, Magnetic Study, and Antidiabetic Activity of Ni(II) Complex with N,O‐Donors Ligands. CRYSTAL RESEARCH AND TECHNOLOGY 2022. [DOI: 10.1002/crat.202200102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ahmed Selmi
- Laboratory of Physical Chemistry of Materials Faculty of Sciences of Monastir University of Monastir Monastir 5019 Tunisia
| | - Khemais Said
- Organic Chemistry Laboratory (LR17/ES08) Department of Chemistry Faculty of Sciences of Sfax University of Sfax Sfax 3018 Tunisia
| | - Saber Nasri
- Laboratory of Spectroscopic Characterization and Optical Materials, Physics Department Faculty of Science of Sfax University of Sfax Sfax 3018 Tunisia
| | - Wafa Tachoua
- Laboratory Nature and Life Sciences Department Benyoucef Benkhedda University Didouche Mourad Algiers 16000 Algeria
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4
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Yamun P, Philip RM, Anilkumar G. Nickel catalyzed hydroamination reactions: An overview. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132936] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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5
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Kumar R, Pandey B, Singh A, Rajaraman G. Mechanistic Insights into the Oxygen Atom Transfer Reactions by Nonheme Manganese Complex: A Computational Case Study on the Comparative Oxidative Ability of Manganese-Hydroperoxo vs High-Valent Mn IV═O and Mn IV-OH Intermediates. Inorg Chem 2021; 60:12085-12099. [PMID: 34293860 DOI: 10.1021/acs.inorgchem.1c01306] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Understanding the comparative oxidative abilities of high-valent metal-oxo/hydroxo/hydroperoxo species holds the key to robust biomimic catalysts that perform desired organic transformations with very high selectivity and efficiency. The comparative oxidative abilities of popular high-valent iron-oxo and manganese-oxo species are often counterintuitive, for example, oxygen atom transfer (OAT) reaction by [(Me2EBC)MnIV-OOH]3+, [(Me2EBC)MnIV-OH]3+, and [(Me2EBC)MnIV═O]2+ (Me2EBC = 4,11-dimethyl-1,4,8,11-tetraazabicyclo[6.6.2]hexadecane) shows extremely high reactivity for MnIV-OOH species and no reactivity for MnIV-OH and MnIV═O species toward alkyl/aromatic sulfides. Using a combination of density functional theory (DFT) and ab initio domain-based local pair natural orbital coupled-cluster with single, double, and perturbative triples excitation (DLPNO-CCSD(T)) and complete-active space self-consistent field/N-electron valence perturbation theory second order (CASSCF/NEVPT2) calculations, here, we have explored the electronic structures and sulfoxidation mechanism of these species. Our calculations unveil that MnIV-OOH reacts through distal oxygen atom with the substrate via electron transfer (ET) mechanism with a very small kinetic barrier (16.5 kJ/mol), placing this species at the top among the best-known catalysts for such transformations. The MnIV-OH and MnIV═O species have a much larger barrier. The mechanism has also been found to switch from ET in the former to concerted in the latter, rendering both unreactive under the tested experimental conditions. Intrinsic differences in the electronic structures, such as the presence and absence of the multiconfigurational character coupled with the steric effects, are responsible for such variations observed. This comparative oxidative ability that runs contrary to the popular iron-oxo/hydroperoxo reactivity will have larger mechanistic implications in understanding the reactivity of biomimic catalysts and the underlying mechanisms in PSII.
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Affiliation(s)
- Ravi Kumar
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Bhawana Pandey
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Akta Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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6
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Yang ZH, Wang Q, Zhuo S, Xu LP. Mechanistic Study on Palladium-Catalyzed Regioselective Oxidative Amination: Roles of Ammonium Salts. J Org Chem 2020; 85:6981-6991. [PMID: 32396725 DOI: 10.1021/acs.joc.0c00296] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Anti-Markovnikov selective oxidative amination reaction with simple alkenes is particularly promising but challenging because of the inherent electronic effect of the alkene substrate which is in favor of the Markovnikov product. In a recently reported Pd-catalyzed anti-Markovnikov oxidative amination reaction, the addition of quaternary ammonium salts is shown to be critical. We performed a comprehensive DFT study to elucidate the reaction mechanism and the origin of the regioselectivity, as well as the roles of the ammonium salts. Our results show that without and with the ammonium salts the reaction mechanisms are different. Detailed analyses indicate that the steric effects account for the switch of regioselectivity. The roles of the quaternary ammonium salts have been elucidated: (1) Me4NOAc plays the role of base in deprotonating the phthalimide and allows the reaction to proceed through a trans-aminopalladation mechanism; (2) Me4NCl facilitates the thermodynamically favorable transformation of Pd(OAc)2 to the palladate ([Pd(AcO)2Cl2]2-), which lessens the polarity of the carbon-carbon double bond, minimizes the inherent electronic effects, and leads to a steric-effect-controlled reaction; (3) Me4NCl is essential in decreasing the activation barrier in the rate-determining ligand exchange step by Cl- acting as a better leaving group (compared to AcO-).
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Affiliation(s)
- Zhen-Hua Yang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 266 West Xincun Road, Zibo, 255000, P. R. China
| | - Qian Wang
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 266 West Xincun Road, Zibo, 255000, P. R. China
| | - Shuping Zhuo
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 266 West Xincun Road, Zibo, 255000, P. R. China
| | - Li-Ping Xu
- School of Chemistry and Chemical Engineering, Shandong University of Technology, 266 West Xincun Road, Zibo, 255000, P. R. China
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7
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Reactivity of nickel metal precursors towards amido linked N-heterocyclic carbenes and their catalytic studies for cross coupling reactions. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119446] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Ramasamy B, Prakasham AP, Gangwar MK, Ghosh P. 1,4‐Conjugate Addition of Aryl boronic Acids on Cyclohexenone as Catalyzed by Rhodium(I) Complexes of
C
2
‐Symmetric Bioxazoline Fused N‐heterocyclic Carbenes. ChemistrySelect 2019. [DOI: 10.1002/slct.201902408] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Balasubramaniyam Ramasamy
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai 400 076
- BASF Chemicals India Pvt. LtdInnovation Campus Navi Mumbai 400 705
| | - A. P. Prakasham
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai 400 076
| | - Manoj Kumar Gangwar
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai 400 076
| | - Prasenjit Ghosh
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai 400 076
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Couce-Rios A, Lledós A, Fernández I, Ujaque G. Origin of the Anti-Markovnikov Hydroamination of Alkenes Catalyzed by L–Au(I) Complexes: Coordination Mode Determines Regioselectivity. ACS Catal 2018. [DOI: 10.1021/acscatal.8b03843] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Almudena Couce-Rios
- Departament de Química and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universitat Autònoma de Barcelona, Cerdanyola del Valles, Catalonia 08193, Spain
| | - Agustí Lledós
- Departament de Química and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universitat Autònoma de Barcelona, Cerdanyola del Valles, Catalonia 08193, Spain
| | - Israel Fernández
- Departamento de Química Orgánica I and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, Madrid 28040, Spain
| | - Gregori Ujaque
- Departament de Química and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universitat Autònoma de Barcelona, Cerdanyola del Valles, Catalonia 08193, Spain
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Zayed EM, Zayed MA, Hindy AM, Mohamed GG. Coordination behaviour and biological activity studies involving theoretical docking of bis-Schiff base ligand and some of its transition metal complexes. Appl Organomet Chem 2018. [DOI: 10.1002/aoc.4603] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Ehab M. Zayed
- Green Chemistry Department; National Research Centre; 33 El Bohouth str. (former El Tahrir str.), Dokki, PO 12622 Giza Egypt
| | - Mohamed A. Zayed
- Chemistry Department, Faculty of Science; Cairo University; Giza 12613 Egypt
| | - Ahmed M.M. Hindy
- Chemistry Department, Faculty of Science; Cairo University; Giza 12613 Egypt
| | - Gehad G. Mohamed
- Chemistry Department, Faculty of Science; Cairo University; Giza 12613 Egypt
- Egypt Nanotechnology Center; Cairo University; El-Sheikh Zayed 12588 6th October, Giza Egypt
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11
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Wu Z, Xiang C, Zhang Y, Song Z, Lei Q, Fang W, Xie H. The reactivity of coordinatively unsaturated iridium methylene complex Ir CH2[N(SiMe2CH2PPh2)2]: A quantum chemistry study. COMPUT THEOR CHEM 2018. [DOI: 10.1016/j.comptc.2018.06.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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12
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Pandey B, Ray K, Rajaraman G. Structure, Bonding, Reactivity and Spectral Features of Putative NiIII
=O Species: A Theoretical Perspective. Z Anorg Allg Chem 2018. [DOI: 10.1002/zaac.201800122] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Bhawana Pandey
- Department of Chemistry; Indian Institute of Technology Bombay; 400 076 Powai India
| | - Kallol Ray
- Institut fár Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Germany
| | - Gopalan Rajaraman
- Department of Chemistry; Indian Institute of Technology Bombay; 400 076 Powai India
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