1
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Li C, Wang Z, Jin M, Song Z. Palladium-Catalyzed Arylation of C(sp 2)-H Bonds and C(sp 3)-H Bonds with 4-Amino-benzotriazole as the Bidentate Directing Group. J Org Chem 2024; 89:6966-6973. [PMID: 38691095 DOI: 10.1021/acs.joc.4c00329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2024]
Abstract
The arylation of C(sp2)-H and C(sp3)-H bonds in carboxylic acids catalyzed by Pd(II) with 4-aminobentriazole as the directing group was investigated. In addition to activation of the C(sp2)-H bond, selective arylation of alkyl carboxylic acids and amino acids in the β position can also be achieved. This strategy involved a 5,5-bicyclic Pd intermediate complex whose structure was determined by X-ray single crystal diffraction analysis. Importantly, the DG (directing group) can be easily removed under mild conditions.
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Affiliation(s)
- Chengqian Li
- College of Chemistry, Jilin University, Jilin, Changchun 130012, P. R. China
| | - Zhuo Wang
- College of Chemistry, Jilin University, Jilin, Changchun 130012, P. R. China
| | - Meina Jin
- College of Chemistry, Jilin University, Jilin, Changchun 130012, P. R. China
| | - Zhiguang Song
- College of Chemistry, Jilin University, Jilin, Changchun 130012, P. R. China
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2
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Lu D, Wu K, Wen TB, Hao W, Zhang HJ. Unusual Kinetics Induced by Ligands in Rhodium(III)-Catalyzed Dehydrogenative Olefination Reactions. J Org Chem 2023. [PMID: 37987772 DOI: 10.1021/acs.joc.3c01300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2023]
Abstract
In this study, we investigate the effects of ligands on C-H activation during rhodium(III)-catalyzed C-H bond olefination reactions using well-defined [CpXRhIII] catalytic systems with three representative CpX (Cp (η5-C5H5), CpCF3 (η5-C5Me4CF3), and Cp* (η5-C5Me5)) ligands. Our results demonstrate that C-H activation as the rate-limiting step is significantly influenced by the steric properties of the CpX ligands. Moreover, we observe a dramatic acceleration of the simple [CpRhIII]-catalyzed C-H olefination reaction with acid coproducts such as HOAc, implying an autocatalytic C-H activation process.
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Affiliation(s)
- Dandan Lu
- Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005 Fujian, P. R. China
| | - Kongchuan Wu
- Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005 Fujian, P. R. China
| | - Ting-Bin Wen
- Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005 Fujian, P. R. China
| | - Wei Hao
- Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, P. R. China
- University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Hui-Jun Zhang
- Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005 Fujian, P. R. China
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3
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Xu J, Qiu W, Zhang X, Wu Z, Zhang Z, Yang K, Song Q. Palladium-Catalyzed Atroposelective Kinetic C-H Olefination and Allylation for the Synthesis of C-B Axial Chirality. Angew Chem Int Ed Engl 2023; 62:e202313388. [PMID: 37840007 DOI: 10.1002/anie.202313388] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2023] [Revised: 10/11/2023] [Accepted: 10/13/2023] [Indexed: 10/17/2023]
Abstract
The direct C-H functionalization of 1,2-benzazaborines, especially asymmetric version, remains a great challenge. Here we report a palladium-catalyzed enantioselective C-H olefination and allylation reactions of 1,2-benzazaborines. This asymmetric approach is a kinetic resolution (KR), providing various C-B axially chiral 2-aryl-1,2-benzazaborines and 3-substituted 2-aryl-1,2-benzazaborines in generally high yields with excellent enantioselectivities (selectivity (S) factor up to 354). The synthetic potential of this reaction is showcased by late-stage modification of complex molecules, scale-up reaction, and applications.
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Affiliation(s)
- Jie Xu
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Weihua Qiu
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Xu Zhang
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Zhihan Wu
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Zhen Zhang
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Kai Yang
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
| | - Qiuling Song
- Key Laboratory of Molecule Synthesis and Function Discovery, Fujian Province University, College of Chemistry at Fuzhou University, Fuzhou, Fujian, 350108, China
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, China
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4
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Arjun V, Jeganmohan M. Chiral Transient Ligand Enabled Enantioselective Synthesis of Atropisomers Decorated with Unactivated Olefins via a Palladium-Catalyzed C-H Olefination. Org Lett 2023; 25:7606-7611. [PMID: 37843003 DOI: 10.1021/acs.orglett.3c02721] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
Herein, atroposelective synthesis of axially chiral biaryls with unactivated olefins by a palladium-catalyzed C-H olefination using a chiral transient directing group strategy has been disclosed. This protocol is well compatible with a variety of biaryl-2-aldehydes as well as various olefins such as allyl sulfonamides and allyl sulfones to provide the atroposelective olefinated products in synthetically useful yields with excellent enantioselectivities up to >99% ee. In addition, a wide number of axially chiral biaryl alcohols were synthesized by the simple diversification of the products in excellent enantioselectivity.
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Affiliation(s)
- Vadivel Arjun
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
| | - Masilamani Jeganmohan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
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5
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Mohite SB, Mane MV, Bera M, Karpoormath R. Palladium-Catalyzed Regiodivergent C-H Olefination of Imidazo[1,2a]pyridine Carboxamide and Unactivated Alkenes. Chemistry 2023:e202302759. [PMID: 37735937 DOI: 10.1002/chem.202302759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 09/21/2023] [Accepted: 09/21/2023] [Indexed: 09/23/2023]
Abstract
Despite remarkable successes in linear and branched vinyl (hetero) arene synthesis, regiodivergent C-H olefination with a single catalytic system has remained underdeveloped. Overcoming this limitation, a Pd/MPAA-catalyzed regiodivergent C-H olefination of imidazo[1,2a] pyridine carboxamides with unactivated terminal alkenes to generate branched and linear olefinated products depending upon the electronic nature of alkenes is reported herein. Moreover, this protocol can be applied for C-H deuteriation of the corresponding heteroarenes with D2 O as deuterium source. Preliminary experimental studies combined with computational investigations (DFT studies) suggest that regiodivergent olefination can be controlled by olefin insertion and β-hydride elimination steps.
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Affiliation(s)
- Sachin Balaso Mohite
- Department of Pharmaceutical Chemistry, Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Westville, Durban, 4000, South Africa
| | - Manoj V Mane
- Centre for Nano and Material Sciences, Jain (Deemed-to-be University), Jain Global Campus, Kanakapura, Bangalore, Karnataka, 562112, India
| | - Milan Bera
- Photocatalysis & Synthetic Methodology Lab (PSML), Amity Institute of Click Chemistry Research & Studies (AICCRS), Amity University, Noida, 201303, India
| | - Rajshekhar Karpoormath
- Department of Pharmaceutical Chemistry, Discipline of Pharmaceutical Sciences, College of Health Sciences, University of KwaZulu-Natal, Westville, Durban, 4000, South Africa
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6
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Logeswaran R, Jeganmohan M. Dehydrogenative Cross-Coupling of α,β-Unsaturated Compounds with Unactivated Olefins via Co(III) Catalysis. Org Lett 2023; 25:6284-6289. [PMID: 37603494 DOI: 10.1021/acs.orglett.3c02095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2023]
Abstract
An oxidative cross-coupling of α,β-unsaturated compounds with unactivated alkenes via cobalt-catalyzed vinylic C-H activation has been developed. The present catalytic reaction was examined with various differently functionalized unsaturated compounds and unactivated olefins. In these reactions, highly valuable amide functionalized butadienes and indenones were prepared in good to excellent yields. A possible reaction mechanism is proposed involving directed olefinic C-H activation through a base-assisted deprotonation pathway.
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Affiliation(s)
- Ravichandran Logeswaran
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
| | - Masilamani Jeganmohan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
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7
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Bhattacharya T, Baroliya PK, Al-Thabaiti SA, Maiti D. Simplifying the Synthesis of Nonproteinogenic Amino Acids via Palladium-Catalyzed δ-Methyl C-H Olefination of Aliphatic Amines and Amino Acids. JACS AU 2023; 3:1975-1983. [PMID: 37502162 PMCID: PMC10369672 DOI: 10.1021/jacsau.3c00215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 06/05/2023] [Accepted: 06/05/2023] [Indexed: 07/29/2023]
Abstract
Transition metal-catalyzed directing group assisted C-H functionalizations provide a straightforward access to a wide variety of nonproteinogenic amino acids. While altering the side chain of an existing natural amino acids is one way, introducing a functional group to an aliphatic amine to synthesize versatile unnatural amino acids is another exciting avenue. In this work, we explore both the possibilities by the palladium-catalyzed δ-C(sp3)-H olefination of aliphatic amines and amino acids. A diverse substrate scope including sequential difunctionalizations followed by post synthetic transformations were achieved to understand the applicability of the current protocol. An in-depth mechanistic study was carried out to learn the mode of the reaction pathway.
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Affiliation(s)
- Trisha Bhattacharya
- Department
of Chemistry, Indian Institute of Technology
Bombay, Powai, Mumbai 400076, India
| | - Prabhat Kumar Baroliya
- Department
of Chemistry, Indian Institute of Technology
Bombay, Powai, Mumbai 400076, India
- Department
of Chemistry, Mohanlal Sukhadia University, Udaipur 313001, India
| | - Shaeel A. Al-Thabaiti
- Department
of Chemistry, Faculty of Science, King Abdulaziz
University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
| | - Debabrata Maiti
- Department
of Chemistry, Indian Institute of Technology
Bombay, Powai, Mumbai 400076, India
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8
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Yun SJ, Kim J, Kang E, Jung H, Kim HT, Kim M, Joo JM. Nondirected Pd-Catalyzed C–H Perdeuteration and meta-Selective Alkenylation of Arenes Enabled by Pyrazolopyridone Ligands. ACS Catal 2023. [DOI: 10.1021/acscatal.2c06303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Affiliation(s)
- Seo Jin Yun
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, South Korea
| | - Jisu Kim
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, South Korea
| | - Eunsu Kang
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, South Korea
| | - Hoimin Jung
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea
| | - Hyun Tae Kim
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, South Korea
| | - Minkyu Kim
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, South Korea
| | - Jung Min Joo
- Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, South Korea
- Department of Chemistry, College of Sciences, Kyung Hee University, Seoul 02447, Republic of Korea
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9
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Shambhavi CN, Jeganmohan M. Ru(II)-Catalyzed C-H Alkenylation of Benzimidates with Unactivated Olefins: A Route to ortho-Alkenylated Benzonitriles. Org Lett 2023; 25:358-363. [PMID: 36606744 DOI: 10.1021/acs.orglett.2c04036] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A Ru(II)-catalyzed C-H alkenylation of benzimidates with unactivated alkenes providing ortho-alkenylated benzonitriles in good to excellent yields in a highly regio- and stereoselective manner is described. In the reaction, an imidate group converted into a nitrile under the reaction conditions. The alkenylation reaction was compatible with various substituted benzimidates as well as functionalized unactivated olefins, including ibuprofen-, neproxen-, coumarin-, and cholesterol-substituted alkenes. A feasible reaction mechanism was proposed to account for the present alkenylation reaction.
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Affiliation(s)
| | - Masilamani Jeganmohan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India
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10
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Shambhavi CN, Jeganmohan M. Rh(III)-Catalyzed Enone Carbonyl/Ketone-Directed Aerobic C-H Olefination of Aromatics with Unactivated Olefins. J Org Chem 2022; 87:13236-13258. [PMID: 36128804 DOI: 10.1021/acs.joc.2c01730] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A Rh(III)-catalyzed weak enone carbonyl/ketone-assisted aerobic oxidative C-H olefination of aromatics with unactivated alkenes has been developed. This protocol involves cross-dehydrogenative Heck-type olefination reaction of various substituted biologically relevant chalcones and aromatic ketones such as acetophenones and chromones with various functionalized unactivated olefins in moderate to good yields. Further, ortho-alkylation of chalcones with norbornene is also demonstrated. A possible reaction mechanism involving weak chelation-assisted C-H activation/insertion/β-hydride elimination was proposed and supported by the deuterium labeling studies.
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Affiliation(s)
| | - Masilamani Jeganmohan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
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11
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Dutta A, Jeganmohan M. Palladium-Catalyzed C-H Functionalization of Aryl Acetamides and Benzoquinones: Synthesis of Substituted Aryl Quinones. J Org Chem 2022; 87:13154-13167. [PMID: 36094897 DOI: 10.1021/acs.joc.2c01625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An efficient synthesis of aryl-substituted quinones via Pd(II)-catalyzed C-H functionalization of less expensive and abundant benzoquinones with aryl acetamides is demonstrated. An auxiliary ligand N,N-bidentate-directing group 8-aminoquinoline plays a crucial role in the success of the reaction. A broad range of substituted phenyl acetamides including commercially available drug molecules were examined and also found to be highly compatible with quinones. The aryl-substituted quinones were also easily converted into aryl-substituted hydroquinone derivatives. A plausible reaction mechanism was proposed to account for the selective distal C-H bond functionalization.
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Affiliation(s)
- Ananya Dutta
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India
| | - Masilamani Jeganmohan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India
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12
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Tomar R, Kumar A, Dalal A, Bhattacharya D, Singh P, Arulananda Babu S. Expanding the utility of inexpensive pyridine‐N‐oxide directing group for the site‐selective sp2/sp3γ‐C‐H and sp2δ‐C‐H functionalization of carboxamides. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Radha Tomar
- Indian Institute of Science Education and Research Mohali Chemical Sciences INDIA
| | - Amit Kumar
- Indian Institute of Science Education and Research Mohali Chemical Sciences INDIA
| | - Arup Dalal
- Indian Institute of Science Education and Research Mohali Chemical Sciences INDIA
| | | | - Prabhakar Singh
- Indian Institute of Science Education and Research Mohali Chemical Sciences INDIA
| | - Srinivasarao Arulananda Babu
- Indian Institute of Science Education and Research Mohali Department of Chemical Sciences Knowledge City, Sector 81, SAS Nagar,Mohali, Manauli P.O., 140306 Mohali INDIA
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13
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Liu M, Sun J, Erbay TG, Ni HQ, Martín-Montero R, Liu P, Engle KM. Pd II -Catalyzed C(alkenyl)-H Activation Facilitated by a Transient Directing Group. Angew Chem Int Ed Engl 2022; 61:e202203624. [PMID: 35467792 PMCID: PMC9320856 DOI: 10.1002/anie.202203624] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2022] [Indexed: 12/12/2022]
Abstract
Palladium(II)‐catalyzed C(alkenyl)−H alkenylation enabled by a transient directing group (TDG) strategy is described. The dual catalytic process takes advantage of reversible condensation between an alkenyl aldehyde substrate and an amino acid TDG to facilitate coordination of the metal catalyst and subsequent C(alkenyl)−H activation by a tailored carboxylate base. The resulting palladacycle then engages an acceptor alkene, furnishing a 1,3‐diene with high regio‐ and E/Z‐selectivity. The reaction enables the synthesis of enantioenriched atropoisomeric 2‐aryl‐substituted 1,3‐dienes, which have seldom been examined in previous literature. Catalytically relevant alkenyl palladacycles were synthesized and characterized by X‐ray crystallography, and the energy profiles of the C(alkenyl)−H activation step and the stereoinduction model were elucidated by density functional theory (DFT) calculations.
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Affiliation(s)
- Mingyu Liu
- Department of Chemistry, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA
| | - Juntao Sun
- Department of Chemistry, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA
| | - Tuğçe G Erbay
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Hui-Qi Ni
- Department of Chemistry, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA
| | - Raúl Martín-Montero
- Department of Chemistry, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Keary M Engle
- Department of Chemistry, The Scripps Research Institute, 10550 N. Torrey Pines Road, La Jolla, CA 92037, USA
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14
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Logeswaran R, Jeganmohan M. Transition‐Metal‐Catalyzed, Chelation‐Assisted C−H Alkenylation and Allylation of Organic Molecules with Unactivated Alkenes. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200193] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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15
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Liu M, Sun J, Erbay TG, Ni H, Martín‐Montero R, Liu P, Engle KM. Pd
II
‐Catalyzed C(alkenyl)−H Activation Facilitated by a Transient Directing Group**. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Mingyu Liu
- Department of Chemistry The Scripps Research Institute 10550 N. Torrey Pines Road La Jolla CA 92037 USA
| | - Juntao Sun
- Department of Chemistry The Scripps Research Institute 10550 N. Torrey Pines Road La Jolla CA 92037 USA
| | - Tuğçe G. Erbay
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Hui‐Qi Ni
- Department of Chemistry The Scripps Research Institute 10550 N. Torrey Pines Road La Jolla CA 92037 USA
| | - Raúl Martín‐Montero
- Department of Chemistry The Scripps Research Institute 10550 N. Torrey Pines Road La Jolla CA 92037 USA
| | - Peng Liu
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Keary M. Engle
- Department of Chemistry The Scripps Research Institute 10550 N. Torrey Pines Road La Jolla CA 92037 USA
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16
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Das KM, Pal A, Adarsh NN, Thakur A. A novel quinoline-based NNN-pincer Cu(II) complex as a superior catalyst for oxidative esterification of allylic C(sp 3)-H bonds. Org Biomol Chem 2022; 20:3540-3549. [PMID: 35393991 DOI: 10.1039/d2ob00220e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report for the first time that the quinoline-based NNN-pincer Cu(II) complex acts as an air stable superior catalyst for the oxidative cross-coupling of the allyl sp3 C-H bond with an acid for the synthesis of allyl esters in a homogeneous system at ambient temperature. The synthesized catalyst, 1, has been well characterized by various analytical techniques (HRMS, single crystal X-ray diffraction, CV, EPR, UV-vis spectroscopy) and showed excellent catalytic activity for the oxidative esterification of allylic C(sp3)-H bonds at 40 °C within a very short period of time (1 h) using only 1 mol% of the catalyst. A wide variety of aromatic allylic esters were synthesized in moderate to good yields, which could be extended to aliphatic allyl esters as well.
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Affiliation(s)
- Krishna Mohan Das
- Department of Chemistry, Jadavpur University, Kolkata-700032, India.
| | - Adwitiya Pal
- Department of Chemistry, Jadavpur University, Kolkata-700032, India.
| | - Nayarassery N Adarsh
- Chemistry and Biomolecular Science, Clarkson University, 8 Clarkson Ave., Potsdam, New York, 13699, USA
| | - Arunabha Thakur
- Department of Chemistry, Jadavpur University, Kolkata-700032, India.
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17
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Wang Z, Ye X, Jin M, Tang Q, Fan S, Song Z, Shi X. 4-Aminobenzotriazole (ABTA) as a Removable Directing Group for Palladium-Catalyzed Aerobic Oxidative C-H Olefination. Org Lett 2022; 24:3107-3112. [PMID: 35324203 DOI: 10.1021/acs.orglett.2c00285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
4-Aminobenzotriazole (ABTA) was applied as an effective removable directing group (DG) in Pd-catalyzed C-H activation for the first time. Compared with the widely applied pyridine and quinoline analogs, ABTA showed significantly improved reactivity, achieving aerobic oxidative C-H olefination in excellent yields (up to 95% vs <50% with other reported DGs under identical conditions). Using this new strategy, macrocyclization was achieved to give cyclic peptides in good yields with easy ABTA removal under mild conditions, highlighting the promising potential of this new DG.
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Affiliation(s)
- Zhuo Wang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Jilin, Changchun 130012, P. R. hina
| | - Xiaohan Ye
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Meina Jin
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Jilin, Changchun 130012, P. R. hina
| | - Qi Tang
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
| | - Shengyu Fan
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Jilin, Changchun 130012, P. R. hina
| | - Zhiguang Song
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Jilin, Changchun 130012, P. R. hina
| | - Xiaodong Shi
- Department of Chemistry, University of South Florida, Tampa, Florida 33620, United States
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18
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Zeng M, Jiang H, Li K, Chen Z, Yin G. Palladium(II)/Lewis Acid-Catalyzed Olefination of Arylacetamides with Dioxygen. J Org Chem 2022; 87:4524-4537. [PMID: 35306815 DOI: 10.1021/acs.joc.1c02783] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The present work introduces Pd(II)/LA-catalyzed (LA: Lewis acid) olefination of arylacetamides with dioxygen as the oxidant source. This protocol tolerates with different functional groups on the substrates, and the catalytic efficiency is highly Lewis acidity-dependent on added LA, that is, a stronger LA provided a better promotional effect. The 1H NMR studies of the semireaction between the arylacetamide and the Pd(II)/Sc(III) catalyst in HOAc-d4 disclosed the formation of a palladacycle intermediate, and the C-H activation step was reversible, which led to the formation of the deuterated arylacetamide substrate and the palladacycle intermediate. Further semireaction between the palladacycle intermediate and the olefin disclosed that it was a clean and much faster reaction than the C-H activation step, thus revealing multiple mechanistic information for Pd(II)-catalyzed C-H activation.
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Affiliation(s)
- Miao Zeng
- School of Chemistry and Chemical Engineering, Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Hongwu Jiang
- School of Chemistry and Chemical Engineering, Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Kaiwen Li
- School of Chemistry and Chemical Engineering, Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Zhuqi Chen
- School of Chemistry and Chemical Engineering, Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
| | - Guochuan Yin
- School of Chemistry and Chemical Engineering, Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, Huazhong University of Science and Technology, Wuhan 430074, P. R. China
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19
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Prusty P, Jambu S, Jeganmohan M. Rh(III)-Catalyzed Selective Olefination of N-Carboxamide Indoles with Unactivated Olefins at Room Temperature via an Internal Oxidation. Org Lett 2022; 24:1121-1126. [DOI: 10.1021/acs.orglett.1c03905] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Priyambada Prusty
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
| | - Subramanian Jambu
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
| | - Masilamani Jeganmohan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
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20
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Tahara K, Takezaki S, Ozawa Y, Abe M. Synthesis of an Organometallic Alkyl-Co(III) Complex with Amidoquinoline Directing Groups via C(sp3)-H Activation and its UV-vis/NMR Spectroscopic, Crystallographic, DFT, and Electrochemical Studies. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20210425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Keishiro Tahara
- Department of Material Science, Graduate School of Science, University of Hyogo, 3-2-1 Kouto, Kamigori, Ako, Hyogo 678-1297, Japan
| | - Shun Takezaki
- Department of Material Science, Graduate School of Science, University of Hyogo, 3-2-1 Kouto, Kamigori, Ako, Hyogo 678-1297, Japan
| | - Yoshiki Ozawa
- Department of Material Science, Graduate School of Science, University of Hyogo, 3-2-1 Kouto, Kamigori, Ako, Hyogo 678-1297, Japan
| | - Masaaki Abe
- Department of Material Science, Graduate School of Science, University of Hyogo, 3-2-1 Kouto, Kamigori, Ako, Hyogo 678-1297, Japan
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21
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Bakthadoss M, Reddy TT, Agarwal V, Sharada DS. Ester-directed orthogonal dual C-H activation and ortho aryl C-H alkenylation via distal weak coordination. Chem Commun (Camb) 2022; 58:1406-1409. [PMID: 34994762 DOI: 10.1039/d1cc06097j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An unprecedented orthogonal cross-coupling between aromatic C(sp2) and aliphatic olefinic C(sp2) carbons of two same molecules via dual C-H bond activation in an intermolecular fashion has been developed using a distal ester-directing group. This new coupling reaction led to the synthesis of the highly functionalized 1,3-diaryl molecular architecture in very good yields and with high chemo- and regioselectivities. In addition, using ester as the distal directing group, ortho C-H olefination of α-methyl aryl acrylates and cinnamic esters with various alkenes has been achieved in very good yields and with a wide range of substrate scope.
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Affiliation(s)
| | | | - Vishal Agarwal
- Department of Chemistry, Pondicherry University, Pondicherry-605014, India.
| | - Duddu S Sharada
- Department of Chemistry, Indian Institute of Technology, Hyderabad, Telangana-502285, India
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22
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Shen C, Zhu Y, Jin S, Xu K, Luo S, Xu L, Zhong G, Zhong L, Zhang J. Regio- and stereo-selective olefinic C–H functionalization of aryl alkenes in ethanol. Org Chem Front 2022. [DOI: 10.1039/d1qo01676h] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We report on α- and β-olefinic C–H alkenylation of 2-alkenyl benzylamine/benzoic acid derivatives in ethanol to afford aryl dienes/trienes with excellent selectivities, proceeding through 6-/7-membered exo-/endo-cyclometallation.
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Affiliation(s)
- Cong Shen
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People's Republic of China
| | - Yuhang Zhu
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People's Republic of China
| | - Shuqi Jin
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People's Republic of China
| | - Kejie Xu
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People's Republic of China
| | - Shuxin Luo
- Department of Stomatology, The Affiliated Hospital of Hangzhou Normal University, Hangzhou Normal University, Hangzhou, 310015, China
| | - Lixia Xu
- Department of Stomatology, The Affiliated Hospital of Hangzhou Normal University, Hangzhou Normal University, Hangzhou, 310015, China
| | - Guofu Zhong
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People's Republic of China
| | - Liangjun Zhong
- Department of Stomatology, The Affiliated Hospital of Hangzhou Normal University, Hangzhou Normal University, Hangzhou, 310015, China
| | - Jian Zhang
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, 311121, Zhejiang, People's Republic of China
- Department of Stomatology, The Affiliated Hospital of Hangzhou Normal University, Hangzhou Normal University, Hangzhou, 310015, China
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23
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Gupta MK, Jena CK, Sharma NK. Pd-Catalyzed C(sp 2)-H olefination: synthesis of N-alkylated isoindolinone scaffolds from aryl amides of amino acid esters. Org Biomol Chem 2021; 19:10097-10104. [PMID: 34791004 DOI: 10.1039/d1ob01997j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Isoindolinone is a constituent of various natural products and synthetic biologically active compounds. The classical multi-step synthetic methods used to prepare various indolinone derivatives are tedious and challenging. One-pot synthetic methods are attractive and economical. Transition-metal-catalyzed C-H activation is an emerging tool for synthesizing natural products and small organic molecules via reducing the number of synthetic steps necessary. This paper describes the synthesis of N-alkyl-3-methenyl chiral isoindolinone derivatives from aryl amides of L-amino acids and non-activated alkene via Pd-catalyzed C(sp2)-H olefination. Herein, the amino acid residue acts as a directing group for olefination at the aryl ring, and then cyclization occurs at the amide NH. Hence, this methodology could be helpful to transform standard amino acids into respective chiral isoindolinone derivatives.
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Affiliation(s)
- Manish K Gupta
- School of Chemical Sciences, National Institute of Science Education and Research (NISER)-Bhubaneswar, Jatni campus, Bhubaneswar-752050, Odisha, India. .,HBNI-Mumbai, Mumbai, India
| | - Chinmay K Jena
- School of Chemical Sciences, National Institute of Science Education and Research (NISER)-Bhubaneswar, Jatni campus, Bhubaneswar-752050, Odisha, India. .,HBNI-Mumbai, Mumbai, India
| | - Nagendra K Sharma
- School of Chemical Sciences, National Institute of Science Education and Research (NISER)-Bhubaneswar, Jatni campus, Bhubaneswar-752050, Odisha, India. .,HBNI-Mumbai, Mumbai, India
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24
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Aleksanyan DV, Churusova SG, Brunova VV, Peregudov AS, Shakhov AM, Rybalkina EY, Klemenkova ZS, Kononova EG, Denisov GL, Kozlov VA. Mechanochemistry for the synthesis of non-classical N-metalated palladium(II) pincer complexes. Dalton Trans 2021; 50:16726-16738. [PMID: 34761776 DOI: 10.1039/d1dt03259c] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The peculiarities of cyclopalladation of a series of non-classical pincer-type ligands based on monothiooxalyl amides bearing ancillary N- or S-donor groups in the amide units have been scrutinized both under conditions of conventional solution-based synthesis and in the absence of a solvent according to a solid-phase methodology including mechanochemical activation. Grinding the functionalized monothiooxamides with PdCl2(NCPh)2 in a mortar or vibration ball mill is shown to serve as an efficient and green alternative to the synthesis of these complex metal-organic systems in solution that can offer such advantages as the absence of any auxiliary and significant rate and yield enhancement, especially for the challenging ligands. The realization of S,N,N- or S,N,S-monoanionic tridentate coordination in the resulting pincer complexes has been confirmed by multinuclear NMR (including 2D NMR) and IR spectroscopy and, in some cases, X-ray diffraction. The course and outcome of the solid-phase reactions have been studied by a combination of different spectroscopic methods as well as SEM/EDS analysis. The preliminary evaluation of cytotoxic activity against several human cancer cell lines has revealed the high potency of some of the cyclopalladated derivatives obtained, rendering further development of solvent-free synthetic routes to this type of complexes very urgent.
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Affiliation(s)
- Diana V Aleksanyan
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991 Russia.
| | - Svetlana G Churusova
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991 Russia.
| | - Valentina V Brunova
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991 Russia.
| | - Alexander S Peregudov
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991 Russia.
| | - Aleksander M Shakhov
- N.N. Semenov Federal Research Center for Chemical Physics, Russian Academy of Sciences, ul. Kosygina 4, Moscow, 119991 Russia
| | - Ekaterina Yu Rybalkina
- Blokhin National Medical Research Center of Oncology of the Ministry of Health of the Russian Federation, Kashirskoe shosse 23, Moscow, 115478 Russia
| | - Zinaida S Klemenkova
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991 Russia.
| | - Elena G Kononova
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991 Russia.
| | - Gleb L Denisov
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991 Russia.
| | - Vladimir A Kozlov
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, ul. Vavilova 28, Moscow, 119991 Russia.
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25
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Barve BD, Kuo YH, Li WT. Pd-Catalyzed and ligand-enabled alkene difunctionalization via unactivated C-H bond functionalization. Chem Commun (Camb) 2021; 57:12045-12057. [PMID: 34724518 DOI: 10.1039/d1cc04397h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Palladium-catalyzed and ligand-enabled C-H functionalization methods have emerged as a powerful approach for the preparation of therapeutically important motifs and complex natural products. Olefins, owing to their natural abundance, have been extensively employed for the formation of C-C and C-X bonds and the generation of various heterocycles. Traditionally, activated as well as starting materials with preinstalled functional groups, and also halide substrates under transition metal catalysis, have been employed for olefin difunctionalization. However, strategies for employing unactivated C-H bond functionalization to achieve alkene difunctionalization have rarely been explored. A possible solution to this challenge is the application of bulky ligands which enhances the reductive elimination pathway and inhibits β-hydride elimination to selectively yield difunctionalized alkene products. This feature article summarizes the utilization of unreactive C-H bonds in the Pd-catalyzed and ligand-enabled difunctionalization of alkenes.
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Affiliation(s)
- Balaji D Barve
- National Research Institute of Chinese Medicine, Ministry of Health and Welfare, Taipei 11221, Taiwan, Republic of China. .,Department of Chemistry, National Taiwan Normal University, Taipei 10610, Taiwan, Republic of China
| | - Yao-Haur Kuo
- National Research Institute of Chinese Medicine, Ministry of Health and Welfare, Taipei 11221, Taiwan, Republic of China.
| | - Wen-Tai Li
- National Research Institute of Chinese Medicine, Ministry of Health and Welfare, Taipei 11221, Taiwan, Republic of China.
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26
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Ghosh S, Shilpa S, Athira C, Sunoj RB. Role of Additives in Transition Metal Catalyzed C–H Bond Activation Reactions: A Computational Perspective. Top Catal 2021. [DOI: 10.1007/s11244-021-01527-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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27
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Sinha NK, Thirupathi N. [6,5] CNN Palladium(II) Pincer Complexes Containing N-Substituted Monoanionic and Dianionic Guanidinate Ligands: Syntheses, Structural Aspects, and Their Utility in Suzuki–Miyaura Coupling Reactions. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00414] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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28
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Desai B, Patel M, Dholakiya BZ, Rana S, Naveen T. Recent advances in directed sp 2 C-H functionalization towards the synthesis of N-heterocycles and O-heterocycles. Chem Commun (Camb) 2021; 57:8699-8725. [PMID: 34397068 DOI: 10.1039/d1cc02176a] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Heterocyclic compounds are widely present in the core structures of several natural products, pharmaceuticals and agrochemicals, and thus great efforts have been devoted to their synthesis in a mild and simpler way. In the past decade, remarkable progress has been made in the field of heterocycle synthesis by employing C-H functionalization as an emerging synthetic strategy. As a complement to previous protocols, transition metal catalyzed C-H functionalization of arenes using various directing groups has recently emerged as a powerful tool to create different classes of heterocycles. This review is mainly focussed on the recent key progress made in the field of the synthesis of N,O-heterocycles from olefins and allenes by using nitrogen based and oxidizing directing groups.
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Affiliation(s)
- Bhargav Desai
- Department of Chemistry, Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat-395 007, India.
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29
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Shambhavi CN, Jeganmohan M. Ruthenium(II)-Catalyzed Redox-Neutral C-H Alkylation of Arylamides with Unactivated Olefins. Org Lett 2021; 23:4849-4854. [PMID: 34060852 DOI: 10.1021/acs.orglett.1c01575] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A Ru(II)-catalyzed weak chelating group-aided ortho-C-H alkylation of arylamides with unactivated olefins in a redox-neutral fashion has been demonstrated. The present alkylation reaction was well-suited for various substituted arylamides and unactivated aliphatic alkenes. In this alkylation reaction, pivalic acid plays dual role in which it delivers the proton source in a protonation step and the corresponding acetate moiety deprotonates the ortho-C-H bond of the arylamides.
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Affiliation(s)
| | - Masilamani Jeganmohan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
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30
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Chen H, Li Y, Liu S, Xiong Q, Bai R, Wei D, Lan Y. On the mechanism of homogeneous Pt-catalysis: A theoretical view. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.213863] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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31
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Jambu S, Shambhavi CN, Jeganmohan M. Aerobic Oxidative C-H Olefination of Arylamides with Unactivated Olefins via a Rh(III)-Catalyzed C-H Activation. Org Lett 2021; 23:2964-2970. [PMID: 33818094 DOI: 10.1021/acs.orglett.1c00646] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient Rh(III)-catalyzed aerobic oxidative C-H alkenylation of arylamides with unactivated alkenes is described. The olefination reaction was compatible with various substituted arylamides including primary, secondary, and tertiary as well as functionalized unactivated olefins. Meanwhile, ortho mono/bis-alkylated arylamides were synthesized in the reaction of arylamides with norbornene. In the alkenylation reaction, molecular oxygen along with organic acid was used to regenerate the active catalyst for the next catalytic cycle. A possible reaction mechanism involving C-H activation/insertion/β-hydride elimination followed by aerobic oxidation was proposed and supported by the deuterium labeling studies.
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Affiliation(s)
- Subramanian Jambu
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
| | | | - Masilamani Jeganmohan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
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32
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Mechanistic investigation of Rh(i)-catalysed asymmetric Suzuki–Miyaura coupling with racemic allyl halides. Nat Catal 2021. [DOI: 10.1038/s41929-021-00589-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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33
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34
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35
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Logeswaran R, Jeganmohan M. Rhodium(III)-Catalyzed Aerobic Oxidative C-H Olefination of Unsaturated Acrylamides with Unactivated Olefins. Org Lett 2021; 23:767-771. [PMID: 33464094 DOI: 10.1021/acs.orglett.0c03981] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A rhodium(III)-catalyzed aerobic oxidative cross-coupling of acrylamides with unactivated alkenes via vinylic C-H activation has been developed. The present cross-coupling reaction was examined with a variety of differently functionalized acrylamides and unactivated olefins. In these reactions, highly valuable amide-functionalized butadienes were prepared in good to excellent yields. This protocol was also compatible with Weinreb amides. A possible reaction mechanism involving the chelation-assisted vinylic C-H activation via a carboxylate-assisted deprotonation pathway is proposed.
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Affiliation(s)
- Ravichandran Logeswaran
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
| | - Masilamani Jeganmohan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
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36
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Ali W, Prakash G, Maiti D. Recent development in transition metal-catalysed C-H olefination. Chem Sci 2021; 12:2735-2759. [PMID: 34164039 PMCID: PMC8179420 DOI: 10.1039/d0sc05555g] [Citation(s) in RCA: 103] [Impact Index Per Article: 34.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Accepted: 12/28/2020] [Indexed: 01/10/2023] Open
Abstract
Transition metal-catalysed functionalizations of inert C-H bonds to construct C-C bonds represent an ideal route in the synthesis of valuable organic molecules. Fine tuning of directing groups, catalysts and ligands has played a crucial role in selective C-H bond (sp2 or sp3) activation. Recent developments in these areas have assured a high level of regioselectivity in C-H olefination reactions. In this review, we have summarized the recent progress in the oxidative olefination of sp2 and sp3 C-H bonds with special emphasis on distal, atroposelective, non-directed sp2 and directed sp3 C-H olefination. The scope, limitation, and mechanism of various transition metal-catalysed olefination reactions have been described briefly.
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Affiliation(s)
- Wajid Ali
- Department of Chemistry, Indian Institute of Technology Bombay Powai Mumbai Maharashtra-400076 India
| | - Gaurav Prakash
- Department of Chemistry, Indian Institute of Technology Bombay Powai Mumbai Maharashtra-400076 India
| | - Debabrata Maiti
- Department of Chemistry, Indian Institute of Technology Bombay Powai Mumbai Maharashtra-400076 India
- Tokyo Tech World Research Hub Initiative (WRHI), Laboratory for Chemistry and Life Science, Tokyo Institute of Technology Tokyo 152-8550 Japan
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37
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Rhodium-catalyzed C–H olefination of aromatic acids with unactivated olefins to achieve branched vinylated or linear allylated product: A theoretical investigation. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2020.111295] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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38
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Liu J, Pan J, Luo X, Qiu X, Zhang C, Jiao N. Selective Dealkenylative Functionalization of Styrenes via C-C Bond Cleavage. RESEARCH 2020; 2020:7947029. [PMID: 33274339 PMCID: PMC7676249 DOI: 10.34133/2020/7947029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 10/08/2020] [Indexed: 02/01/2023]
Abstract
As a readily available feedstock, styrene with about 25 million tons of global annual production serves as an important building block and organic synthon for the synthesis of fine chemicals, polystyrene plastics, and elastomers. Thus, in the past decades, many direct transformations of this costless styrene feedstock were disclosed for the preparation of high-value chemicals, which to date, generally performed on the functionalization of styrenes through the allylic C-H bond, C(sp2)-H bond, or the C=C double bond cleavage. However, the dealkenylative functionalization of styrenes via the direct C-C single bond cleavage is so far challenging and still unknown. Herein, we report the novel and efficient C-C amination and hydroxylation reactions of styrenes for the synthesis of valuable aryl amines and phenols via the site-selective C(Ar)-C(alkenyl) single bond cleavage. This chemistry unlocks the new transformation and application of the styrene feedstock and provides an efficient protocol for the late-stage modification of substituted styrenes with the site-directed dealkenylative amination and hydroxylation.
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Affiliation(s)
- Jianzhong Liu
- State Key Laboratory of Natural and Biomimetic Drugs, Peking University, 100191 Beijing, China
| | - Jun Pan
- State Key Laboratory of Natural and Biomimetic Drugs, Peking University, 100191 Beijing, China
| | - Xiao Luo
- State Key Laboratory of Natural and Biomimetic Drugs, Peking University, 100191 Beijing, China
| | - Xu Qiu
- State Key Laboratory of Natural and Biomimetic Drugs, Peking University, 100191 Beijing, China
| | - Cheng Zhang
- State Key Laboratory of Natural and Biomimetic Drugs, Peking University, 100191 Beijing, China
| | - Ning Jiao
- State Key Laboratory of Natural and Biomimetic Drugs, Peking University, 100191 Beijing, China.,State Key Laboratory of Organometallic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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39
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Rani G, Luxami V, Paul K. Traceless directing groups: a novel strategy in regiodivergent C-H functionalization. Chem Commun (Camb) 2020; 56:12479-12521. [PMID: 32985634 DOI: 10.1039/d0cc04863a] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The use of functional groups as internal ligands for assisting C-H functionalization, termed the chelation assisted strategy, is emerging as one of the most powerful tools for construction of C-C and C-X bonds from inert C-H bonds. However, there are various directing groups which cannot be either removed after functionalization or require some additional steps or reagents for their removal, thereby limiting the scope of structural diversity of the products, and the step and atom economy of the system. These limitations are overcome by the use of the traceless directing group (TDG) strategy wherein functionalization of the substrate and removal of the directing group can be carried out in a one pot fashion. Traceless directing groups serve as the most ideal chelation assisted strategy with a high degree of reactivity and selectivity without any requirement for additional steps for their removal. The present review overviews the use of various functional groups such as carboxylic acids, aldehydes, N-oxides, nitrones, N-nitroso amines, amides, sulfoxonium ylides and silicon tethered directing groups for assisting transition metal catalyzed C-H functionalization reactions in the last decade.
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Affiliation(s)
- Geetika Rani
- School of Chemistry and Biochemistry, Thapar Institute of Engineering and Technology, Patiala-147001, India.
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40
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Das J, Dolui P, Ali W, Biswas JP, Chandrashekar HB, Prakash G, Maiti D. A direct route to six and seven membered lactones via γ-C(sp 3)-H activation: a simple protocol to build molecular complexity. Chem Sci 2020; 11:9697-9702. [PMID: 34094235 PMCID: PMC8162128 DOI: 10.1039/d0sc03144e] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022] Open
Abstract
Lactones comprise a class of valuable compounds having biological as well as industrial importance. Development of a methodology to synthesize such molecules directly from readily available materials such as aliphatic carboxylic acid is highly desirable. Herein, we have reported synthesis of δ-lactones and ε-lactones via selective γ-C(sp3)–H activation. The γ-C–H bond containing aliphatic carboxylic acids provide six or seven membered lactones depending on the olefin partner in the presence of a palladium catalyst. A mechanistic investigation suggests that C–H activation is the rate-determining step. Further transformations of the lactones have been carried out to showcase the applicability of the present strategy. Six and seven membered lactones have been synthesized directly from readily available aliphatic acids.![]()
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Affiliation(s)
- Jayabrata Das
- Department of Chemistry, IIT Bombay Powai Mumbai 400076 India
| | - Pravas Dolui
- Department of Chemistry, IIT Bombay Powai Mumbai 400076 India
| | - Wajid Ali
- Department of Chemistry, IIT Bombay Powai Mumbai 400076 India
| | | | | | - Gaurav Prakash
- Department of Chemistry, IIT Bombay Powai Mumbai 400076 India
| | - Debabrata Maiti
- Department of Chemistry, IIT Bombay Powai Mumbai 400076 India .,Tokyo Tech World Research Hub Initiative(WRHI), Laboratory for Chemistry and Life Science, Tokyo Institute of Technology Tokyo 152-8550 Japan
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Wang YJ, Wang TT, Yao L, Wang QL, Zhao LM. Access to 4-Alkenylated Coumarins via Ruthenium-Catalyzed Olefinic C-H Alkenylation of Coumarins with Modifiable and Removable Directing Groups. J Org Chem 2020; 85:9514-9524. [PMID: 32515197 DOI: 10.1021/acs.joc.0c00249] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The ruthenium-catalyzed activation of the C4 position of coumarins for coupling with acrylates was described using modifiable ketone as a directing group. The alkenylation reaction provided a direct approach to prepare previously inaccessible 4-alkenylated coumarins with operational simplicity and high atom-economy. This protocol also worked well with coumarin-3-carboxylic acids to unveil a rare instance of a tandem alkenylation/decarboxylation reaction. The potential value of this approach was further highlighted by the efficient synthesis of several heterocyclic fused coumarin derivatives.
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Affiliation(s)
- Yu-Jiao Wang
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
| | - Tong-Tong Wang
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
| | - Lan Yao
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
| | - Qian-Long Wang
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China
| | - Li-Ming Zhao
- School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China.,State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
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Wang J, Ling B, Liu P, Liu Y, Jiang YY, Bi S. Density Functional Theory Study on the Mechanism of Iridium-Catalyzed Benzylamine ortho C-H Alkenylation with Ethyl Acrylate. ACS OMEGA 2020; 5:15446-15453. [PMID: 32637819 PMCID: PMC7331057 DOI: 10.1021/acsomega.0c01587] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 06/02/2020] [Indexed: 05/02/2023]
Abstract
Iridium-catalyzed oxidative o-alkenylation of benzylamines with acrylates was enabled by the directing group pentafluorobenzoyl (PFB). Density functional theory calculations were performed to explore the detailed reaction mechanism. The calculated results reveal that N-deprotonation prior to C-H activation is favored over direct C-H activation. Moreover, C-H activation is reversible and not the rate-determining step, which has been supported by the experimental observation. The regio- and stereoselectivity of ethyl acrylate insertion are controlled by the steric effect and the carbon atom with a larger orbital coefficient of the π* antibonding orbital in the nucleophilic attack, respectively. The migratory insertion of ethyl acrylate is computationally found to be rate-determining for the whole catalytic cycle. Finally, the seven-membered ring intermediate IM11 undergoes a sequential N-protonation and β-H elimination with the assistance of AcOH, rather than β-H elimination and reductive elimination proposed experimentally, to afford the o-alkenylated product. IM11 is unable to directly cyclize through C-N reductive elimination because both sp3-hybridized N and C atoms are unfavorable for N-C reductive elimination. The origin of the directing group PFB preventing the product and intermediates undergoing aza-Michael addition has been explained.
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Pati TK, Ajarul S, Kundu M, Tayde D, Khamrai U, Maiti DK. Synthesis of Functionalized Arylacetamido-2-pyridones through ortho-C(sp2)–H-Activated Installation of Olefins and Alkynes. J Org Chem 2020; 85:8563-8579. [DOI: 10.1021/acs.joc.0c00941] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tanmay K. Pati
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India
- TCG Life Sciences Pvt. Ltd., BN-7, Sector V, Salt Lake City, Kolkata 700091, India
| | - Sk Ajarul
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India
| | - Mrinalkanti Kundu
- TCG Life Sciences Pvt. Ltd., BN-7, Sector V, Salt Lake City, Kolkata 700091, India
| | - Deepak Tayde
- TCG Life Sciences Pvt. Ltd., BN-7, Sector V, Salt Lake City, Kolkata 700091, India
| | - Uttam Khamrai
- TCG Life Sciences Pvt. Ltd., BN-7, Sector V, Salt Lake City, Kolkata 700091, India
| | - Dilip K. Maiti
- Department of Chemistry, University of Calcutta, 92, A. P. C. Road, Kolkata 700009, India
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Omer HM, Liu P, Brummond KM. Metal-Free C-C Coupling of an Allenyl Sulfone with Picolyl Amides to Access Vinyl Sulfones via Pyridine-Initiated In Situ Generation of Sulfinate Anion. J Org Chem 2020; 85:7959-7975. [PMID: 32423208 DOI: 10.1021/acs.joc.0c00788] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Vinyl sulfones are privileged motifs known for their biological activity and synthetic utility. Synthetic transformations to efficiently access high-value compounds with these motifs are desired and sought after. Herein, a new procedure is described to form vinyl sulfone-containing compounds by selective functionalization of the C(sp3)-H bond adjacent to the pyridine ring of pharmacologically prevalent picolyl amides with an allenyl sulfone, 1-methyl-4-(propa-1,2-dien-1-ylsulfonyl)benzene. The reaction conditions are mild with no metal catalyst or additives required and display good functional group tolerance. Mechanistic studies for this unusual transformation suggest that the reaction operates via a rare pyridine-initiated and p-toluenesulfinate anion-mediated activation of the allenyl sulfone analogous to phosphine-triggered reactions.
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Affiliation(s)
- Humair M Omer
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Kay M Brummond
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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Jambu S, Jeganmohan M. Rhodium(III)-Catalyzed C–H Olefination of Aromatic/Vinyl Acids with Unactivated Olefins at Room Temperature. Org Lett 2020; 22:5057-5062. [DOI: 10.1021/acs.orglett.0c01636] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Subramanian Jambu
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
| | - Masilamani Jeganmohan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
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Li X, Hu X, Liu Z, Yang J, Mei B, Dong Y, Liu G. Ruthenium-Catalyzed Selectively Oxidative C–H Alkenylation of N-Acylated Aryl Sulfonamides by Using Molecular Oxygen as an Oxidant. J Org Chem 2020; 85:5916-5926. [DOI: 10.1021/acs.joc.0c00242] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Xueyuan Li
- School of Pharmaceutical Sciences, Tsinghua University, Haidian District, Beijing 100084, China
| | - Xiao Hu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Zijie Liu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Jingshu Yang
- School of Pharmaceutical Sciences, Tsinghua University, Haidian District, Beijing 100084, China
| | - Bo Mei
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Yi Dong
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Gang Liu
- School of Pharmaceutical Sciences, Tsinghua University, Haidian District, Beijing 100084, China
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Rej S, Ano Y, Chatani N. Bidentate Directing Groups: An Efficient Tool in C-H Bond Functionalization Chemistry for the Expedient Construction of C-C Bonds. Chem Rev 2020; 120:1788-1887. [PMID: 31904219 DOI: 10.1021/acs.chemrev.9b00495] [Citation(s) in RCA: 578] [Impact Index Per Article: 144.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
During the past decades, synthetic organic chemistry discovered that directing group assisted C-H activation is a key tool for the expedient and siteselective construction of C-C bonds. Among the various directing group strategies, bidentate directing groups are now recognized as one of the most efficient devices for the selective functionalization of certain positions due to fact that its metal center permits fine, tunable, and reversible coordination. The family of bidentate directing groups permit various types of assistance to be achieved, such as N,N-dentate, N,O-dentate, and N,S-dentate auxiliaries, which are categorized based on the coordination site. In this review, we broadly discuss various C-H bond functionalization reactions for the formation of C-C bonds with the aid of bidentate directing groups.
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Affiliation(s)
- Supriya Rej
- Department of Applied Chemistry, Faculty of Engineering , Osaka University , Suita , Osaka 560-0871 , Japan
| | - Yusuke Ano
- Department of Applied Chemistry, Faculty of Engineering , Osaka University , Suita , Osaka 560-0871 , Japan
| | - Naoto Chatani
- Department of Applied Chemistry, Faculty of Engineering , Osaka University , Suita , Osaka 560-0871 , Japan
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48
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Wen C, Jiang X, Wu K, Luo R, Li Q. Palladium-catalyzed cross-coupling reaction of alkenyl aluminums with 2-bromobenzo[b]furans. RSC Adv 2020; 10:19610-19614. [PMID: 35515440 PMCID: PMC9054126 DOI: 10.1039/d0ra02984j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 05/16/2020] [Indexed: 12/18/2022] Open
Abstract
Highly efficient and simple cross-coupling reactions of 2-bromobenzo[b]furans with alkenylaluminum reagents for the synthesis of 2-alkenylbenzo[b]furan derivatives using PdCl2 (3 mol%)/XantPhos (6 mol%) as catalyst are reported. Excellent yields (up to 97%) were obtained for a wide range of substrates at 80 °C for 4 h in DCE. PdCl2 (3 mol%)/XantPhos (6 mol%) complexes was found to be a highly efficient catalyst for the synthesis of 2-alkenylbenzo[b]furans from 2-bromobenzo[b]furans and alkenylaluminums. The reaction was also found to be effective in gram-scale synthesis.![]()
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Affiliation(s)
- Chang Wen
- College of Chemistry and Environmental Protection Engineering
- Southwest University for Nationalities
- Chengdu
- China
| | - Xin Jiang
- College of Chemistry and Environmental Protection Engineering
- Southwest University for Nationalities
- Chengdu
- China
| | - Kun Wu
- College of Chemistry and Environmental Protection Engineering
- Southwest University for Nationalities
- Chengdu
- China
| | - Ruiqiang Luo
- College of Chemistry and Environmental Protection Engineering
- Southwest University for Nationalities
- Chengdu
- China
| | - Qinghan Li
- College of Chemistry and Environmental Protection Engineering
- Southwest University for Nationalities
- Chengdu
- China
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Zhao LL, Liu W, Zhang Z, Zhao H, Wang Q, Yan X. Ruthenium-Catalyzed ortho- and meta-H/D Exchange of Arenes. Org Lett 2019; 21:10023-10027. [PMID: 31797670 DOI: 10.1021/acs.orglett.9b03955] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Ruthenium-catalyzed aromatic H/D exchange in [D4]acetic acid has been developed. By using N-heteroarenes as directing groups, both ortho and meta positions are selectively deuterated with high levels of D incorporation. Moreover, this strategy provides an alternative way to achieve meta-C-H activation.
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Affiliation(s)
- Liang-Liang Zhao
- Department of Chemistry , Renmin University of China , Beijing 100872 , China
| | - Wei Liu
- Department of Chemistry , Renmin University of China , Beijing 100872 , China
| | - Zengyu Zhang
- Department of Chemistry , Renmin University of China , Beijing 100872 , China
| | - Hongyan Zhao
- Department of Chemistry , Renmin University of China , Beijing 100872 , China
| | - Qi Wang
- Department of Chemistry , Renmin University of China , Beijing 100872 , China
| | - Xiaoyu Yan
- Department of Chemistry , Renmin University of China , Beijing 100872 , China
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Roy P, Bour JR, Kampf JW, Sanford MS. Catalytically Relevant Intermediates in the Ni-Catalyzed C(sp 2)-H and C(sp 3)-H Functionalization of Aminoquinoline Substrates. J Am Chem Soc 2019; 141:17382-17387. [PMID: 31618019 DOI: 10.1021/jacs.9b09109] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
This Article describes the synthesis and characterization of cyclometalated aminoquinoline NiII σ-aryl and σ-alkyl complexes that have been proposed as key intermediates in Ni-catalyzed C-H functionalization reactions. These NiII complexes serve as competent catalysts for the C-H functionalization of aminoquinoline derivatives with I2. They also react stoichiometrically with I2 to form either aryl iodides or β-lactams within minutes at room temperature. Furthermore, they react with AgI salts at -30 °C to afford isolable five-coordinate NiIII species. The NiIII σ-aryl complexes proved inert toward C(sp2)-I bond-forming reductive elimination under all conditions examined (up to 140 °C in DMF). In contrast, a NiIII σ-alkyl analogue underwent C(sp3)-N bond-forming reductive elimination at 140 °C in DMF to afford a β-lactam product. However, despite the ability of this latter NiIII species to participate in stoichiometric product formation, the complex was not a competent catalyst for β-lactam formation. Overall, these results suggest against the intermediacy of NiIII species in these C-H functionalization reactions.
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Affiliation(s)
- Pronay Roy
- Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109 , United States
| | - James R Bour
- Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109 , United States
| | - Jeff W Kampf
- Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109 , United States
| | - Melanie S Sanford
- Department of Chemistry , University of Michigan , 930 North University Avenue , Ann Arbor , Michigan 48109 , United States
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