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Kyndiah L, Sarkar FK, Gajurel S, Sarkar R, Anal JMH, Pal AK. Pd@GO catalyzed stereo- and regio-selective addition of arenes to alkynes and synthesis of coumarins via C-H functionalization. Org Biomol Chem 2023; 21:7928-7934. [PMID: 37766675 DOI: 10.1039/d3ob01237a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/29/2023]
Abstract
A stereo- and regio-selective addition of arenes to alkynes via C-H bond functionalization has been developed using palladium nanoparticles supported on graphite oxide (Pd@GO) as the reusable catalyst. The prepared catalyst was characterized by various spectroscopic techniques such as FT-IR, TEM, SEM, EDX, P-XRD, and XPS analysis. The thermal stability of the catalyst was established by TGA. The C-H functionalized products were obtained in good to excellent yields (69-92%) at room temperature. The methodology further extended to the synthesis of biologically and pharmaceutically important coumarin molecules from phenols and alkynes. Good to excellent yields of the coumarins (74-92%) were obtained. After the reaction, the catalyst was separated by centrifugation followed by filtration. The recovered catalyst was washed and reused up to five cycles. The advantages of this method are the simple procedure of the catalyst preparation, high catalytic efficiency, high selectivity, good functional group tolerance, low catalyst loading, and gram-scale synthesis.
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Affiliation(s)
- Lenida Kyndiah
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong-793022, Meghalaya, India.
| | - Fillip Kumar Sarkar
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong-793022, Meghalaya, India.
| | - Sushmita Gajurel
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong-793022, Meghalaya, India.
| | - Rajib Sarkar
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong-793022, Meghalaya, India.
| | - Jasha Momo H Anal
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu, Canal Road, Jammu-180001, India
| | - Amarta Kumar Pal
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong-793022, Meghalaya, India.
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Yamada T, Hashimoto Y, Tanaka K, Morita N, Tamura O. Cationic palladium(ii)-catalyzed synthesis of substituted pyridines from α,β-unsaturated oxime ethers. RSC Adv 2022; 12:21548-21557. [PMID: 36043185 PMCID: PMC9351437 DOI: 10.1039/d2ra03875g] [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] [Received: 06/23/2022] [Accepted: 07/14/2022] [Indexed: 11/21/2022] Open
Abstract
An efficient method for the synthesis of multi-substituted pyridines from β-aryl-substituted α,β-unsaturated oxime ethers and alkenes via Pd-catalyzed C–H activation has been developed. The method, using Pd(OAc)2 and a sterically hindered pyridine ligand, provides access to various multi-substituted pyridines with complete regioselectivity. Mechanistic studies suggest that the pyridine products are formed by Pd-catalyzed electrophilic C–H alkenylation of α,β-unsaturated oxime followed by aza-6π-electrocyclization. The utility of this method is showcased by the synthesis of 4-aryl-substituted pyridine derivatives, which are difficult to synthesize efficiently using previously reported Rh-catalyzed strategies with alkenes. An efficient method for the synthesis of multi-substituted pyridines from α,β-unsaturated oxime ethers via cationic Pd(ii)-catalyzed C–H activation has been developed.![]()
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Affiliation(s)
- Takahiro Yamada
- Showa Pharmaceutical University Machida Tokyo 194-8543 Japan
| | | | - Kosaku Tanaka
- Showa Pharmaceutical University Machida Tokyo 194-8543 Japan
| | | | - Osamu Tamura
- Showa Pharmaceutical University Machida Tokyo 194-8543 Japan
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3
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Affiliation(s)
- José‐Antonio García‐López
- Grupo de Química Organometálica Departamento de Química Inorgánica Facultad de Química Universidad de Murcia 30100 Murcia Spain
| | - Isabel Saura‐Llamas
- Grupo de Química Organometálica Departamento de Química Inorgánica Facultad de Química Universidad de Murcia 30100 Murcia Spain
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4
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Wang C, Liu Z, Yin ZC, Wang GW. Synthesis of [60]fullerene-fused dihydrobenzooxazepinesviathe palladium-catalyzed oxime-directed C–H bond activation and subsequent electrochemical functionalization. Org Chem Front 2020. [DOI: 10.1039/d0qo00710b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The palladium-catalyzed heteroannulation of [60]fullerene with oximes affords the unprecedented seven-membered [60]fullerene-fused dihydrobenzooxazepines, which can be further derivatized electrochemically.
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Affiliation(s)
- Chen Wang
- CAS Key Laboratory of Soft Matter Chemistry
- Hefei National Laboratory for Physical Sciences at Microscale
- and Department of Chemistry
- University of Science and Technology of China
- Hefei
| | - Zhan Liu
- CAS Key Laboratory of Soft Matter Chemistry
- Hefei National Laboratory for Physical Sciences at Microscale
- and Department of Chemistry
- University of Science and Technology of China
- Hefei
| | - Zheng-Chun Yin
- CAS Key Laboratory of Soft Matter Chemistry
- Hefei National Laboratory for Physical Sciences at Microscale
- and Department of Chemistry
- University of Science and Technology of China
- Hefei
| | - Guan-Wu Wang
- CAS Key Laboratory of Soft Matter Chemistry
- Hefei National Laboratory for Physical Sciences at Microscale
- and Department of Chemistry
- University of Science and Technology of China
- Hefei
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5
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Singh VK, Donthireddy SNR, Illam PM, Rit A. Transition metal complexes of a bis(carbene) ligand featuring 1,2,4-triazolin-5-ylidene donors: structural diversity and catalytic applications. Dalton Trans 2020; 49:11958-11970. [PMID: 32812607 DOI: 10.1039/d0dt02142c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Dialkylation of the 1,3-bis(1,2,4-triazol-1-yl)benzene with ethyl bromide results in the formation of [L-H2]Br2 which, upon salt metathesis with NH4PF6, readily yields the bis(triazolium) salt [L-H2](PF6)2 with non-coordinating counterions. [L-H2](PF6)2 and Ag2O react in a 1 : 1 ratio to yield a binuclear AgI-tetracarbene complex of the composition [(L)2Ag2](PF6)2 which undergoes a facile transmetalation reaction with [Cu(SMe2)Br] to deliver the corresponding CuI-NHC complex [(L)2Cu2](PF6)2. In contrast, the [L-H2]Br2 reacts with [Ir(Cp*)Cl2]2 to generate a doubly C-H activated IrIII-NHC complex 5. Similarly, the triazolinylidene donor supported diorthometalated RuII-complex 6 is also obtained. Complexes 5 and 6 represent the first examples of a stable diorthometalated binuclear IrIII/RuII-complex supported by 1,2,4-triazolin-5-ylidene donors. The synthesized IrIII-NHC complex 5 is found to be more effective than its RuII-analogue (6) for the reduction of a range of alkenes/alkynes via the transfer hydrogenation strategy. Conversely, RuII-complex 6 is identified as an efficient catalyst (0.01 mol% loading) for the β-alkylation of a wide range of secondary alcohols using primary alcohols as alkylating partners via a borrowing hydrogen strategy.
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Affiliation(s)
- Vivek Kumar Singh
- Department of Chemistry, Indian Institute of Technology, Madras, Chennai 600036, India.
| | - S N R Donthireddy
- Department of Chemistry, Indian Institute of Technology, Madras, Chennai 600036, India.
| | | | - Arnab Rit
- Department of Chemistry, Indian Institute of Technology, Madras, Chennai 600036, India.
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6
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Voccia M, Falivene L, Cavallo L, Tubaro C, Biffis A, Caporaso L. Ligand Effects in Pd-Catalyzed Intermolecular Alkyne Hydroarylations. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maria Voccia
- Department of Chemistry, University of Salerno, Via Ponte Don Melillo, 84084-Fisciano, SA, Italy
| | - Laura Falivene
- King Abdullah University of Science and Technology, Chemical and Life Sciences and Engineering, Kaust Catalysis Center, Thuwal 23955-6900, Saudi Arabia
| | - Luigi Cavallo
- Department of Chemistry, University of Salerno, Via Ponte Don Melillo, 84084-Fisciano, SA, Italy
- King Abdullah University of Science and Technology, Chemical and Life Sciences and Engineering, Kaust Catalysis Center, Thuwal 23955-6900, Saudi Arabia
| | - Cristina Tubaro
- Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, Padova 35131, Italy
| | - Andrea Biffis
- Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, Padova 35131, Italy
| | - Lucia Caporaso
- Department of Chemistry, University of Salerno, Via Ponte Don Melillo, 84084-Fisciano, SA, Italy
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7
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Lee J, Su Y, Wang Y, Lee HM. Tetranuclear Palladium Complexes of Abnormal
N
‐Heterocyclic Carbene Ligands and their Catalytic Activities in Mizoroki‐Heck Coupling Reaction of Electron‐Rich Aryl Chlorides. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900805] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jhen‐Yi Lee
- Department of ChemistryNational Changhua University of Education Changhua 50058 Taiwan
| | - Yong‐Siang Su
- Department of ChemistryNational Changhua University of Education Changhua 50058 Taiwan
| | - Yu‐Shan Wang
- Department of ChemistryNational Changhua University of Education Changhua 50058 Taiwan
| | - Hon Man Lee
- Department of ChemistryNational Changhua University of Education Changhua 50058 Taiwan
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8
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Baron M, Biffis A. Gold(I) Complexes in Ionic Liquids: An Efficient Catalytic System for the C-H Functionalization of Arenes and Heteroarenes under Mild Conditions. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900529] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Marco Baron
- Dipartimento di Scienze Chimiche; Università degli Studi di Padova; Via Marzolo1 35131 Padova Italy
| | - Andrea Biffis
- Dipartimento di Scienze Chimiche; Università degli Studi di Padova; Via Marzolo1 35131 Padova Italy
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9
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Akiyama R, Sugaya M, Shinozaki H, Yamamoto T. NHC-coordinated palladacycle catalyzed 1,2-addition of arylboronates to unactivated ketones. SYNTHETIC COMMUN 2019. [DOI: 10.1080/00397911.2019.1594307] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Ryo Akiyama
- Department of Materials Science and Engineering, Graduate School of Engineering, Tokyo Denki University, Adachi-ku, Tokyo, Japan
| | - Mariko Sugaya
- Department of Materials Science and Engineering, Graduate School of Engineering, Tokyo Denki University, Adachi-ku, Tokyo, Japan
| | - Hiraku Shinozaki
- Department of Applied Chemistry, School of Engineering, Tokyo Denki University, Adachi-ku, Tokyo, Japan
| | - Tetsuya Yamamoto
- Department of Applied Chemistry, School of Engineering, Tokyo Denki University, Adachi-ku, Tokyo, Japan
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10
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Hu Y, Guo S. Palladacycles bearing COOH-/ester-functionalized N-heterocyclic carbenes: Divergent syntheses and catalytic applications. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4703] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yanyan Hu
- Department of Chemistry; Capital Normal University; Beijing People's Republic of China
| | - Shuai Guo
- Department of Chemistry; Capital Normal University; Beijing People's Republic of China
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11
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Soellner J, Strassner T. Phosphorescent Cyclometalated Platinum(II) aNHC Complexes. Chemistry 2018; 24:15603-15612. [PMID: 30216572 DOI: 10.1002/chem.201802725] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 07/16/2018] [Indexed: 02/05/2023]
Abstract
The synthesis and characterization of the first bidentate C^C* cyclometalated platinum(II) complexes based on abnormal N-heterocyclic carbenes (aNHC) is presented. The aNHC ligand precursors are prepared from benzonitriles and anilines to form 1,2,3-trisubstituted imidazolium salts. The title compounds were synthesized by in situ generation of the silver carbene complex, followed by transmetalation to platinum and subsequent introduction of the β-diketonate ligand. Structural characterization by 2D NMR experiments, as well as solid-state structures unequivocally prove the abnormal binding mode of the aNHC ligands. Additionally, the photophysical properties of the platinum(II) complexes were examined and studied in detail by DFT calculations and cyclic voltammetry experiments. The title compounds proved to be strongly emissive at room temperature in the green to orange region of the visible spectrum, with emission efficiencies of up to 69 %.
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Affiliation(s)
- Johannes Soellner
- Physikalische Organische Chemie, Technische Universität Dresden, 01069, Dresden, Germany), Fax: (+49) 351-463-39679
| | - Thomas Strassner
- Physikalische Organische Chemie, Technische Universität Dresden, 01069, Dresden, Germany), Fax: (+49) 351-463-39679
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12
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P S, Sau SC, Vardhanapu PK, Mandal SK. Halo-Bridged Abnormal NHC Palladium(II) Dimer for Catalytic Dehydrogenative Cross-Coupling Reactions of Heteroarenes. J Org Chem 2018; 83:9403-9411. [DOI: 10.1021/acs.joc.8b01053] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Sreejyothi P
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
| | - Samaresh Chandra Sau
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
| | - Pavan K. Vardhanapu
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
| | - Swadhin K. Mandal
- Department of Chemical Sciences, Indian Institute of Science Education and Research, Kolkata, Mohanpur 741246, India
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13
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Jose A, Vijaykumar G, Vardhanapu PK, Mandal SK. Abnormal NHC supported palladacycles: Regioselective arylation of heteroarenes via decarboxylation. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.01.046] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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