1
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Kunz S, Barnå F, Urrutia MP, Ingner FJL, Martínez-Topete A, Orthaber A, Gates PJ, Pilarski LT, Dyrager C. Derivatization of 2,1,3-Benzothiadiazole via Regioselective C-H Functionalization and Aryne Reactivity. J Org Chem 2024; 89:6138-6148. [PMID: 38648018 PMCID: PMC11077497 DOI: 10.1021/acs.joc.4c00122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2024] [Revised: 02/29/2024] [Accepted: 03/15/2024] [Indexed: 04/25/2024]
Abstract
Despite growing interest in 2,1,3-benzothiadiazole (BTD) as an integral component of many functional molecules, methods for the functionalization of its benzenoid ring have remained limited, and many even simply decorated BTDs have required de novo synthesis. We show that regioselective Ir-catalyzed C-H borylation allows access to versatile 5-boryl or 4,6-diboryl BTD building blocks, which undergo functionalization at the C4, C5, C6, and C7 positions. The optimization and regioselectivity of C-H borylation are discussed. A broad reaction scope is presented, encompassing ipso substitution at the C-B bond, the first examples of ortho-directed C-H functionalization of BTD, ring closing reactions to generate fused ring systems, as well as the generation and capture reactions of novel BTD-based heteroarynes. The regioselectivity of the latter is discussed with reference to the Aryne Distortion Model.
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Affiliation(s)
- Susanna Kunz
- Department
of Chemistry—BMC, Uppsala University, Box 576, Uppsala 75123, Sweden
| | - Fredrik Barnå
- Department
of Chemistry—BMC, Uppsala University, Box 576, Uppsala 75123, Sweden
| | | | | | | | - Andreas Orthaber
- Department
of Chemistry—Ångström, Uppsala University, Box 523, Uppsala 75120, Sweden
| | - Paul J. Gates
- School
of Chemistry, University of Bristol, Cantock’s Close, Clifton, Bristol BS8 1TS, U.K.
| | - Lukasz T. Pilarski
- Department
of Chemistry—BMC, Uppsala University, Box 576, Uppsala 75123, Sweden
| | - Christine Dyrager
- Department
of Chemistry—BMC, Uppsala University, Box 576, Uppsala 75123, Sweden
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2
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Zhao H, Zhao CY, Chen L, Xia C, Hong X, Xu S. Aryl Chloride-Directed Enantioselective C(sp 2)-H Borylation Enabled by Iridium Catalysis. J Am Chem Soc 2023; 145:25214-25221. [PMID: 37934914 DOI: 10.1021/jacs.3c08129] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2023]
Abstract
We herein report the iridium-catalyzed enantioselective C-H borylation of aryl chlorides. A variety of prochiral biaryl compounds could be well-tolerated, affording a vast array of axially chiral biaryls with high enantioselectivities. The current method exhibits a high turnover number (TON) of 7000, which represents the highest in functional-group-directed asymmetric C-H activation. The high TON was attributed to a weak catalyst-substrate interaction that was caused by mismatched chirality between catalyst and substrate. We also demonstrated the synthetic application of the current method by C-B, ortho-C-H, and C-Cl bond functionalization, including programmed Suzuki-Miyaura coupling for the synthesis of axially chiral polyarenes.
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Affiliation(s)
- Hongliang Zhao
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chao-Yue Zhao
- Ningbo Key Laboratory of Agricultural Germplasm Resources Mining and Environmental Regulation, College of Science and Technology, Ningbo University, Ningbo 315300, China
| | - Lili Chen
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Chungu Xia
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xin Hong
- Center of Chemistry for Frontier Technologies, Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Senmiao Xu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- College of Material Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China
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3
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Balachandran C, Hirose M, Tanaka T, Zhu JJ, Yokoi K, Hisamatsu Y, Yamada Y, Aoki S. Design and Synthesis of Poly(2,2'-Bipyridyl) Ligands for Induction of Cell Death in Cancer Cells: Control of Anticancer Activity by Complexation/Decomplexation with Biorelevant Metal Cations. Inorg Chem 2023; 62:14615-14631. [PMID: 37642721 PMCID: PMC10498496 DOI: 10.1021/acs.inorgchem.3c01738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Indexed: 08/31/2023]
Abstract
Chelation therapy is a medical procedure for removing toxic metals from human organs and tissues and for the treatment of diseases by using metal-chelating agents. For example, iron chelation therapy is designed not only for the treatment of metal poisoning but also for some diseases that are induced by iron overload, cancer chemotherapy, and related diseases. However, the use of such metal chelators needs to be generally carried out very carefully, because of the side effects possibly due to the non-specific complexation with intracellular metal cations. Herein, we report on the preparation and characterization of some new poly(bpy) ligands (bpy: 2,2'-bipyridyl) that contain one-three bpy ligand moieties and their anticancer activity against Jurkat, MOLT-4, U937, HeLa S3, and A549 cell lines. The results of MTT assays revealed that the tris(bpy) and bis(bpy) ligands exhibit potent activity for inducing the cell death in cancer cells. Mechanistic studies suggest that the main pathway responsible for the cell death by these poly(bpy) ligands is apoptotic cell death. It was also found that the anticancer activity of the poly(bpy) ligands could be controlled by the complexation (anticancer activity is turned OFF) and decomplexation (anticancer activity is turned ON) with biorelevant metal cations. In this paper, these results will be described.
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Affiliation(s)
- Chandrasekar Balachandran
- Faculty
of Pharmaceutical Sciences, Tokyo University
of Science, 2641 Yamazaki, Noda 278-8510, Japan
- Research
Institute for Biomedical Sciences, Tokyo
University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Masumi Hirose
- Faculty
of Pharmaceutical Sciences, Tokyo University
of Science, 2641 Yamazaki, Noda 278-8510, Japan
| | - Tomohiro Tanaka
- Faculty
of Pharmaceutical Sciences, Tokyo University
of Science, 2641 Yamazaki, Noda 278-8510, Japan
| | - Jun Jie Zhu
- Faculty
of Pharmaceutical Sciences, Tokyo University
of Science, 2641 Yamazaki, Noda 278-8510, Japan
| | - Kenta Yokoi
- Faculty
of Pharmaceutical Sciences, Tokyo University
of Science, 2641 Yamazaki, Noda 278-8510, Japan
| | - Yosuke Hisamatsu
- Faculty
of Pharmaceutical Sciences, Tokyo University
of Science, 2641 Yamazaki, Noda 278-8510, Japan
- Graduate
School of Pharmaceutical Sciences, Nagoya
City University, 3-1
Tanabe-dori, Nagoya, Aichi 467-8603, Japan
| | - Yasuyuki Yamada
- Department
of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
- Research
Center for Materials Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Shin Aoki
- Faculty
of Pharmaceutical Sciences, Tokyo University
of Science, 2641 Yamazaki, Noda 278-8510, Japan
- Research
Institute for Biomedical Sciences, Tokyo
University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
- Research
Institute for Science and Technology, Tokyo
University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
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4
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Andrews M, Carpentier A, Slawin AMZ, Cordes DB, Macgregor SA, Watson AJB. Mechanism of Cu-Catalyzed Iododeboronation: A Description of Ligand-Enabled Transmetalation, Disproportionation, and Turnover in Cu-Mediated Oxidative Coupling Reactions. ACS Catal 2023; 13:11117-11126. [PMID: 37614524 PMCID: PMC10442916 DOI: 10.1021/acscatal.3c02839] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 07/25/2023] [Indexed: 08/25/2023]
Abstract
We report a combined experimental and computational study of the mechanism of the Cu-catalyzed arylboronic acid iododeboronation reaction. A combination of structural and density functional theory (DFT) analyses has allowed determination of the identity of the reaction precatalyst with insight into each step of the catalytic cycle. Key findings include a rationale for ligand (phen) stoichiometry related to key turnover events-the ligand facilitates transmetalation via H-bonding to an organoboron boronate generated in situ and phen loss/gain is integral to the key oxidative events. These data provide a framework for understanding ligand effects on these key mechanistic processes, which underpin several classes of Cu-mediated oxidative coupling reactions.
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Affiliation(s)
- Matthew
J. Andrews
- EaStCHEM,
School of Chemistry, University of St Andrews, Purdie Building, St Andrews KY16 9ST, U.K.
| | - Ambre Carpentier
- Institute
of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K.
| | - Alexandra M. Z. Slawin
- EaStCHEM,
School of Chemistry, University of St Andrews, Purdie Building, St Andrews KY16 9ST, U.K.
| | - David B. Cordes
- EaStCHEM,
School of Chemistry, University of St Andrews, Purdie Building, St Andrews KY16 9ST, U.K.
| | - Stuart A. Macgregor
- Institute
of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, U.K.
| | - Allan J. B. Watson
- EaStCHEM,
School of Chemistry, University of St Andrews, Purdie Building, St Andrews KY16 9ST, U.K.
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5
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Hauenschild T, Hinderberger D. A New Rapid and Specific Iodination Reagent for Phenolic Compounds. ORGANICS 2023. [DOI: 10.3390/org4020011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/08/2023] Open
Abstract
A new rapid iodination reagent, N1,N3,N5-tris[(2,4,6-trimethylpyridine)iodo(I)]-2,4,6-triphenyl-s-triazine trihexafluorophosphate, was synthesized in a modification of the established synthesis of 2,4,6-triiodo-3,5-dimethylphenol in the presence of bis(2,4,6-trimethylpyridine)iodo(I) hexafluorophosphate and used for the precise post-modification of mono- and trisubstituted phenyl compounds. We performed triple iodinations with our new phenyl-based compounds as a proof of principle of selected types of phenols, ß-sympatholytic agents and their spin-labeled derivatives, which can be employed in electron paramagnetic resonance (EPR) spectroscopy. The new rapid iodination reagent can be employed with high reactivity and regioselectivity.
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Affiliation(s)
- Till Hauenschild
- Institute of Chemistry, Physical Chemistry—Complex Self-Organizing Systems, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
- Toxicology—Drug & Medical Analytics, R&D, Head of Laboratory (“General Unknown Screening”), MVZ Medizinische Labore Dessau Kassel GmbH—Limbach Gruppe SE, Bauhüttenstraße 6, 06847 Dessau-Roßlau, Germany
| | - Dariush Hinderberger
- Institute of Chemistry, Physical Chemistry—Complex Self-Organizing Systems, Martin Luther University Halle-Wittenberg, Von-Danckelmann-Platz 4, 06120 Halle (Saale), Germany
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6
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Sun J, Jena HS, Abednatanzi S, Liu YY, Leus K, Van Der Voort P. A Green Alternative for the Direct Aerobic Iodination of Arenes Using Molecular Iodine and a POM@MOF Catalyst. ACS APPLIED MATERIALS & INTERFACES 2022; 14:37681-37688. [PMID: 35943818 DOI: 10.1021/acsami.2c07130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Iodoarenes are important precursors for fine chemicals and pharmaceuticals. The direct iodination of arenes using molecular iodine (I2) has emerged as an attractive green synthesis method. Most of the direct iodination protocols are still homogeneous systems that require harsh conditions and use or produce toxic products. We report a new heterogeneous catalytic route for the direct aerobic iodination of arenes under mild conditions using a PMoV2 polyoxometalate (POM) embedded in the metal-organic framework (MOF) MIL-101 (PMoV2@MIL-101). The catalyst shows full yield for the conversion of mesitylene to 2-iodomesitylene at a rate that is similar to the homogeneous POM system. Moreover, the catalyst is applicable for a wide range of substrates in an oxygen atmosphere without using any co-catalysts or sacrificial agents. To the best of our knowledge, this is the first report on designing a sustainable and green MOF-based heterogeneous catalytic system for the direct iodination reaction using molecular oxygen and iodine.
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Affiliation(s)
- Jiamin Sun
- COMOC─Center for Ordered Materials, Organometallics and Catalysis, Department of Chemistry, Ghent University, Krijgslaan 281, Building S3, 9000 Ghent, Belgium
| | - Himanshu Sekhar Jena
- COMOC─Center for Ordered Materials, Organometallics and Catalysis, Department of Chemistry, Ghent University, Krijgslaan 281, Building S3, 9000 Ghent, Belgium
| | - Sara Abednatanzi
- COMOC─Center for Ordered Materials, Organometallics and Catalysis, Department of Chemistry, Ghent University, Krijgslaan 281, Building S3, 9000 Ghent, Belgium
| | - Ying-Ya Liu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 116023 Dalian, PR China
| | - Karen Leus
- COMOC─Center for Ordered Materials, Organometallics and Catalysis, Department of Chemistry, Ghent University, Krijgslaan 281, Building S3, 9000 Ghent, Belgium
| | - Pascal Van Der Voort
- COMOC─Center for Ordered Materials, Organometallics and Catalysis, Department of Chemistry, Ghent University, Krijgslaan 281, Building S3, 9000 Ghent, Belgium
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7
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Zou X, Li Y, Ke Z, Xu S. Chiral Bidentate Boryl Ligand-Enabled Iridium-Catalyzed Enantioselective Dual C–H Borylation of Ferrocenes: Reaction Development and Mechanistic Insights. ACS Catal 2022. [DOI: 10.1021/acscatal.1c05299] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiaoliang Zou
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Yinwu Li
- School of Materials Science & Engineering, PCFM Lab, Sun Yat-sen University, Guangzhou 510275, China
| | - Zhuofeng Ke
- School of Materials Science & Engineering, PCFM Lab, Sun Yat-sen University, Guangzhou 510275, China
| | - Senmiao Xu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China
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8
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Maity P, Sarkar P, Mukhopadhyay C. Generation of I-, ArS- and ArSe- substituted pyrrolo[3,4–c]pyridine derivatives using copper iodide as an iodinating agent. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Alavinia S, Ghorbani-Vaghei R. Poly-N-bromosulfonamide-melamine as a novel brominating reagent for regioselective ipso-bromination of arylboronic acids. MONATSHEFTE FUR CHEMIE 2021. [DOI: 10.1007/s00706-021-02827-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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10
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Late-stage C–H functionalization offers new opportunities in drug discovery. Nat Rev Chem 2021; 5:522-545. [PMID: 37117588 DOI: 10.1038/s41570-021-00300-6] [Citation(s) in RCA: 261] [Impact Index Per Article: 87.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/02/2021] [Indexed: 12/24/2022]
Abstract
Over the past decade, the landscape of molecular synthesis has gained major impetus by the introduction of late-stage functionalization (LSF) methodologies. C-H functionalization approaches, particularly, set the stage for new retrosynthetic disconnections, while leading to improvements in resource economy. A variety of innovative techniques have been successfully applied to the C-H diversification of pharmaceuticals, and these key developments have enabled medicinal chemists to integrate LSF strategies in their drug discovery programmes. This Review highlights the significant advances achieved in the late-stage C-H functionalization of drugs and drug-like compounds, and showcases how the implementation of these modern strategies allows increased efficiency in the drug discovery process. Representative examples are examined and classified by mechanistic patterns involving directed or innate C-H functionalization, as well as emerging reaction manifolds, such as electrosynthesis and biocatalysis, among others. Structurally complex bioactive entities beyond small molecules are also covered, including diversification in the new modalities sphere. The challenges and limitations of current LSF methods are critically assessed, and avenues for future improvements of this rapidly expanding field are discussed. We, hereby, aim to provide a toolbox for chemists in academia as well as industrial practitioners, and introduce guiding principles for the application of LSF strategies to access new molecules of interest.
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11
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Wang J, Torigoe T, Kuninobu Y. Urea-accelerated Iridium-catalyzed 2-Position-selective C–H Borylation of Indole Derivatives. CHEM LETT 2021. [DOI: 10.1246/cl.200939] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Jie Wang
- Department of Molecular and Material Sciences, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
| | - Takeru Torigoe
- Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
- Department of Molecular and Material Sciences, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
| | - Yoichiro Kuninobu
- Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
- Department of Molecular and Material Sciences, Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, Japan
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12
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Zhu ZF, Chen GL, Liu F. Ruthenium-catalysed meta-selective C Ar-H bond alkylation via a deaminative strategy. Chem Commun (Camb) 2021; 57:3411-3414. [PMID: 33687414 DOI: 10.1039/d1cc00039j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The use of aliphatic amines as alkylating reagents in organic synthesis via C-N bond activation remains underdeveloped. We herein describe a novel ruthenium-catalysed and directing-group assisted protocol for the synthesis of meta-alkylated arenes via dual C-H and C-N activation. Bench-stable and easily handled redox-active Katritzky pyridinium salts derived from abundant amines and amino acid species were used as alkyl radical precursors. This catalytic reaction could accommodate a broad range of functional groups and provide access to various meta-alkylated products.
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Affiliation(s)
- Ze-Fan Zhu
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Department of Medicinal Chemistry, College of Pharmaceutical Sciences, Soochow University, 199 Ren-Ai Road, Suzhou, Jiangsu 215123, People's Republic of China.
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13
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Rej S, Chatani N. Transient Imine as a Directing Group for the Metal-Free o-C-H Borylation of Benzaldehydes. J Am Chem Soc 2021; 143:2920-2929. [PMID: 33586953 DOI: 10.1021/jacs.0c13013] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Organoboron reagents are important synthetic intermediates and have wide applications in synthetic organic chemistry. The selective borylation strategies that are currently in use largely rely on the use of transition-metal catalysts. Hence, identifying much milder conditions for transition-metal-free borylation would be highly desirable. We herein present a unified strategy for the selective C-H borylation of electron-deficient benzaldehyde derivatives using a simple metal-free approach, utilizing an imine transient directing group. The strategy covers a wide spectrum of reactions and (i) even highly sterically hindered C-H bonds can be borylated smoothly, (ii) despite the presence of other potential directing groups, the reaction selectively occurs at the o-C-H bond of the benzaldehyde moiety, and (iii) natural products appended to benzaldehyde derivatives can also give the appropriate borylated products. Moreover, the efficacy of the protocol was confirmed by the fact that the reaction proceeds even in the presence of a series of external impurities.
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Affiliation(s)
- Supriya Rej
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Naoto Chatani
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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14
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Budiman YP, Westcott SA, Radius U, Marder TB. Fluorinated Aryl Boronates as Building Blocks in Organic Synthesis. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202001291] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Yudha P. Budiman
- Institute for Inorganic Chemistry Julius-Maximilians University Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron Julius-Maximilians University Würzburg Am Hubland 97074 Würzburg Germany
- Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Padjadjaran 45363 Jatinangor Indonesia
| | - Stephen A. Westcott
- Department of Chemistry and Biochemistry Mount Allison University Sackville NB E4 L 1G8 Canada
| | - Udo Radius
- Institute for Inorganic Chemistry Julius-Maximilians University Würzburg Am Hubland 97074 Würzburg Germany
| | - Todd B. Marder
- Institute for Inorganic Chemistry Julius-Maximilians University Würzburg Am Hubland 97074 Würzburg Germany
- Institute for Sustainable Chemistry & Catalysis with Boron Julius-Maximilians University Würzburg Am Hubland 97074 Würzburg Germany
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15
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Kise K, Ooi S, Osuka A, Tanaka T. Five‐fold‐symmetric Pentabromo‐ and Pentaiodo‐corannulenes: Useful Precursors of Heteroatom‐substituted Corannulenes. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202000688] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Koki Kise
- Department of Chemistry Graduate School of Science Kyoto University Sakyo-ku Kyoto 606-8502 Japan
| | - Shota Ooi
- Department of Chemistry Graduate School of Science Kyoto University Sakyo-ku Kyoto 606-8502 Japan
| | - Atsuhiro Osuka
- Department of Chemistry Graduate School of Science Kyoto University Sakyo-ku Kyoto 606-8502 Japan
| | - Takayuki Tanaka
- Department of Chemistry Graduate School of Science Kyoto University Sakyo-ku Kyoto 606-8502 Japan
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16
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Lai D, Ghosh S, Hajra A. Light-induced borylation: developments and mechanistic insights. Org Biomol Chem 2021; 19:4397-4428. [PMID: 33913460 DOI: 10.1039/d1ob00323b] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Organoboron compounds are very important derivatives because of their profound impacts on medicinal, biological as well as industrial applications. The development of several novel borylation methodologies has achieved momentous interest among synthetic chemists. In this scenario, eco-friendly light-induced borylation is progressively becoming one of the best synthetic tools in recent days to prepare organoboronic ester and acid derivatives based on green chemistry rules. In this article, we have discussed all the UV- and visible-light-induced borylation strategies developed in the last decade. Furthermore, special attention is given to the mechanisms of these borylation methodologies for better understanding of reaction insights.
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Affiliation(s)
- Dipti Lai
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
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17
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Gao S, Duan M, Shao Q, Houk KN, Chen M. Development of α,α-Disubstituted Crotylboronate Reagents and Stereoselective Crotylation via Brønsted or Lewis Acid Catalysis. J Am Chem Soc 2020; 142:18355-18368. [PMID: 33052047 DOI: 10.1021/jacs.0c04107] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The development of α,α-disubstituted crotylboronate reagents is reported. Chiral Brønsted acid-catalyzed asymmetric aldehyde addition with the developed E-crotylboron reagent gave (E)-anti-1,2-oxaborinan-3-enes with excellent enantioselectivities and E-selectivities. With BF3·OEt2 catalysis, the stereoselectivity is reversed, and (Z)-δ-boryl-anti-homoallylic alcohols are obtained with excellent Z-selectivities from the same E-crotylboron reagent. The Z-crotylboron reagent also participates in BF3·OEt2-catalyzed crotylation to furnish (Z)-δ-boryl-syn-homoallylic alcohols with good Z-selectivities. DFT computations establish the origins of observed enantio- and stereoselectivities of chiral Brønsted acid-catalyzed asymmetric allylation. Stereochemical models for BF3·OEt2-catalyzed reactions are proposed to rationalize the Z-selective allyl additions. These reactions generate highly valuable homoallylic alcohol products with a stereodefined trisubstituted alkene unit. The synthetic utility is further demonstrated by the total syntheses of salinipyrones A and B.
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Affiliation(s)
- Shang Gao
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States
| | - Meng Duan
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Qianzhen Shao
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, United States
| | - Ming Chen
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, United States
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18
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Fricke C, Deckers K, Schoenebeck F. Orthogonal Stability and Reactivity of Aryl Germanes Enables Rapid and Selective (Multi)Halogenations. Angew Chem Int Ed Engl 2020; 59:18717-18722. [PMID: 32656881 PMCID: PMC7590071 DOI: 10.1002/anie.202008372] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Revised: 07/08/2020] [Indexed: 01/07/2023]
Abstract
While halogenation is of key importance in synthesis and radioimaging, the currently available repertoire is largely designed to introduce a single halogen per molecule. This report makes the selective introduction of several different halogens accessible. Showcased here is the privileged stability of nontoxic aryl germanes under harsh fluorination conditions (that allow selective fluorination in their presence), while displaying superior reactivity and functional-group tolerance in electrophilic iodinations and brominations, outcompeting silanes or boronic esters under rapid and additive-free conditions. Mechanistic experiments and computational studies suggest a concerted electrophilic aromatic substitution as the underlying mechanism.
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Affiliation(s)
- Christoph Fricke
- Institute of Organic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
| | - Kristina Deckers
- Institute of Organic ChemistryRWTH Aachen UniversityLandoltweg 152074AachenGermany
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19
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Fricke C, Deckers K, Schoenebeck F. Orthogonal Stability and Reactivity of Aryl Germanes Enables Rapid and Selective (Multi)Halogenations. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008372] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Christoph Fricke
- Institute of Organic Chemistry RWTH Aachen University Landoltweg 1 52074 Aachen Germany
| | - Kristina Deckers
- Institute of Organic Chemistry RWTH Aachen University Landoltweg 1 52074 Aachen Germany
| | - Franziska Schoenebeck
- Institute of Organic Chemistry RWTH Aachen University Landoltweg 1 52074 Aachen Germany
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20
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Karmel C, Rubel CZ, Kharitonova EV, Hartwig JF. Iridium-Catalyzed Silylation of Five-Membered Heteroarenes: High Sterically Derived Selectivity from a Pyridyl-Imidazoline Ligand. Angew Chem Int Ed Engl 2020; 59:6074-6081. [PMID: 31968139 DOI: 10.1002/anie.201916015] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Indexed: 11/09/2022]
Abstract
The steric effects of substituents on five-membered rings are less pronounced than those on six-membered rings because of the difference in bond angles. Thus, the regioselectivities of reactions of five-membered heteroarenes that occur with selectivities dictated by steric effects, such as the borylation of C-H bonds, have been poor in many cases. We report that the silylation of five-membered-ring heteroarenes occurs with high sterically derived regioselectivity when catalyzed by the combination of [Ir(cod)(OMe)]2 (cod=1,5-cyclooctadiene) and a phenanthroline ligand or a new pyridyl-imidazoline ligand that further increases the regioselectivity. The silylation reactions with these catalysts produce high yields of heteroarylsilanes from functionalization at the most sterically accessible C-H bonds of these rings under conditions that the borylation of C-H bonds with previously reported catalysts formed mixtures of products or products that are unstable. The heteroarylsilane products undergo cross-coupling reactions and substitution reactions with ipso selectivity to generate heteroarenes that bear halogen, aryl, and perfluoroalkyl substituents.
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Affiliation(s)
- Caleb Karmel
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
| | - Camille Z Rubel
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
| | | | - John F Hartwig
- Department of Chemistry, University of California, Berkeley, CA, 94720, USA
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21
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Saito Y, Yamanoue K, Segawa Y, Itami K. Selective Transformation of Strychnine and 1,2-Disubstituted Benzenes by C–H Borylation. Chem 2020. [DOI: 10.1016/j.chempr.2020.02.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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22
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Karmel C, Rubel CZ, Kharitonova EV, Hartwig JF. Iridium-Catalyzed Silylation of Five-Membered Heteroarenes: High Sterically Derived Selectivity from a Pyridyl-Imidazoline Ligand. ACTA ACUST UNITED AC 2020; 132:6130-6137. [PMID: 33071367 DOI: 10.1002/ange.201916015] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The steric effects of substituents on five-membered rings are less pronounced than those on six-membered rings because of the difference in bond angles. Thus, the regioselectivities of reactions that occur with selectivities dictated by steric effects, such as the borylation of C-H bonds, have been poor in many cases. We report that the silylation of five-membered ring heteroarenes occurs with high sterically derived regioselectivity when catalyzed by the combination of [Ir(cod)(OMe)]2 and a phenanthroline ligand or a new pyridyl-imidazoline ligand that further increases the regioselectivity. The silylation reactions with these catalysts produce high yields of heteroarylsilanes from functionalization at the most sterically accessible C-H bonds of these rings under conditions that the borylation of C-H bonds with previously reported catalysts formed mixtures of products or products that are unstable. The heteroarylsilane products undergo cross-coupling reactions and substitution reactions with ipso selectivity to generate heteroarenes that bear halogen, aryl and perfluoroalkyl substituents.
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Affiliation(s)
- Caleb Karmel
- Department of Chemistry, University of California, Berkeley, CA, 94720 USA
| | - Camille Z Rubel
- Department of Chemistry, University of California, Berkeley, CA, 94720 USA
| | | | - John F Hartwig
- Department of Chemistry, University of California, Berkeley, CA, 94720 USA
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23
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Melot R, Craveiro MV, Baudoin O. Total Synthesis of (Nor)illudalane Sesquiterpenes Based on a C(sp 3)-H Activation Strategy. J Org Chem 2019; 84:12933-12945. [PMID: 31322348 DOI: 10.1021/acs.joc.9b01669] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Three (nor)illudalane sesquiterpenes were synthesized from a common intermediate in racemic and enantioenriched forms using Pd0-catalyzed C(sp3)-H arylation as a key step. The configuration of the isolated, highly symmetric quaternary stereocenter of the target molecules was controlled through a matched combination of chiral substrate and catalyst. Moreover, the recently developed Ir-catalyzed C-H borylation/Cu-catalyzed methylation method was employed to install the methyl group on the benzene ring. This strategy allowed the efficient synthesis of both racemic and (S)-configured puraquinonic acid, deliquinone, and russujaponol F.
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Affiliation(s)
- Romain Melot
- Department of Chemistry , University of Basel , St. Johanns-Ring 19 , CH-4056 Basel , Switzerland
| | - Marcus V Craveiro
- Department of Chemistry , University of Basel , St. Johanns-Ring 19 , CH-4056 Basel , Switzerland
| | - Olivier Baudoin
- Department of Chemistry , University of Basel , St. Johanns-Ring 19 , CH-4056 Basel , Switzerland
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24
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Kommagalla Y, Chatani N. Cobalt-Catalyzed C–H Iodination of Aromatic Amides with Molecular Iodine through the Use of a 2-Aminophenyloxazoline-Based Bidentate-Chelation System. Org Lett 2019; 21:5971-5976. [DOI: 10.1021/acs.orglett.9b02109] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Yadagiri Kommagalla
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Naoto Chatani
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
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25
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Li X, Deng X, Coyne AG, Srinivasan R. meta-Nitration of Arenes Bearing ortho/para Directing Group(s) Using C-H Borylation. Chemistry 2019; 25:8018-8023. [PMID: 30974007 DOI: 10.1002/chem.201901633] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Indexed: 11/07/2022]
Abstract
Herein, we report the meta-nitration of arenes bearing ortho/para directing group(s) using the iridium-catalyzed C-H borylation reaction followed by a newly developed copper(II)-catalyzed transformation of the crude aryl pinacol boronate esters into the corresponding nitroarenes in a one-pot fashion. This protocol allows the synthesis of meta-nitrated arenes that are tedious to prepare or require multistep synthesis using the existing methods. The reaction tolerates a wide array of ortho/para-directing groups, such as -F, -Cl, -Br, -CH3 , -Et, -iPr -OCH3 , and -OCF3 . It also provides regioselective access to the nitro derivatives of π-electron-deficient heterocycles, such as pyridine and quinoline derivatives. The application of this method is demonstrated in the late-stage modification of complex molecules and also in the gram-scale preparation of an intermediate en route to the FDA-approved drug Nilotinib. Finally, we have shown that the nitro product obtained by this strategy can also be directly converted to the aniline or hindered amine through Baran's amination protocol.
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Affiliation(s)
- Xuejing Li
- School of Pharmaceutical Science and Technology (SPST), Tianjin University, 92 Weijin Road, Building 24, Nankai District, Tianjin, 300072, P.R. China
| | - Xingwang Deng
- School of Pharmaceutical Science and Technology (SPST), Tianjin University, 92 Weijin Road, Building 24, Nankai District, Tianjin, 300072, P.R. China
| | - Anthony G Coyne
- University Chemical Laboratory, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Rajavel Srinivasan
- School of Pharmaceutical Science and Technology (SPST), Tianjin University, 92 Weijin Road, Building 24, Nankai District, Tianjin, 300072, P.R. China
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26
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Takallou A, Habibi A, Halimehjani AZ, Balalaie S. Bis(imidazolium) chloride based on 1,2-phenylenediamine as efficient ligand precursor for palladium-catalyzed Mizoroki-Heck cross-coupling reaction. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2019.02.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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Karmel C, Chen Z, Hartwig JF. Iridium-Catalyzed Silylation of C-H Bonds in Unactivated Arenes: A Sterically Encumbered Phenanthroline Ligand Accelerates Catalysis. J Am Chem Soc 2019; 141:7063-7072. [PMID: 30971087 DOI: 10.1021/jacs.9b01972] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
We report a new system for the silylation of aryl C-H bonds. The combination of [Ir(cod)(OMe)]2 and 2,9-Me2-phenanthroline (2,9-Me2-phen) catalyzes the silylation of arenes at lower temperatures and with faster rates than those reported previously, when the hydrogen byproduct is removed, and with high functional group tolerance and regioselectivity. Inhibition of reactions by the H2 byproduct is shown to limit the silylation of aryl C-H bonds in the presence of the most active catalysts, thereby masking their high activity. Analysis of initial rates uncovered the high reactivity of the catalyst containing the sterically hindered 2,9-Me2-phen ligand but accompanying rapid inhibition by hydrogen. With this catalyst, under a flow of nitrogen to remove hydrogen, electron-rich arenes, including those containing sensitive functional groups, undergo silylation in high yield for the first time, and arenes that underwent silylation with prior catalysts react over much shorter times with lower catalyst loadings. The synthetic value of this methodology is demonstrated by the preparation of key intermediates in the synthesis of medicinally important compounds in concise sequences comprising silylation and functionalization. Mechanistic studies demonstrate that the cleavage of the aryl C-H bond is reversible and that the higher rates observed with the 2,9-Me2-phen ligand are due to a more thermodynamically favorable oxidative addition of aryl C-H bonds.
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Affiliation(s)
- Caleb Karmel
- Department of Chemistry , University of California , Berkeley , California 94720 , United States
| | - Zhewei Chen
- Department of Chemistry , University of California , Berkeley , California 94720 , United States
| | - John F Hartwig
- Department of Chemistry , University of California , Berkeley , California 94720 , United States
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28
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Wang J, Torigoe T, Kuninobu Y. Hydrogen-Bond-Controlled Formal Meta-Selective C-H Transformations and Regioselective Synthesis of Multisubstituted Aromatic Compounds. Org Lett 2019; 21:1342-1346. [PMID: 30735396 DOI: 10.1021/acs.orglett.9b00030] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The meta-selective introduction of functional groups into aromatic substrates was successfully achieved by hydrogen-bond-controlled meta-selective C-H borylation and successive conversion of the boryl group to other functional groups. By this method a wide range of functional groups could be introduced without isolation of the borylated intermediates. The desired meta-functionalized aromatic products were obtained in a one-pot manner even on a gram scale. Regioselective synthesis of multisubstituted aromatic compounds was also achieved.
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Affiliation(s)
- Jie Wang
- Department of Molecular and Material Sciences, Interdisciplinary Graduate School of Engineering Sciences , Kyushu University , 6-1 Kasugakoen , Kasuga-shi , Fukuoka 816-8580 , Japan
| | - Takeru Torigoe
- Institute for Materials Chemistry and Engineering , Kyushu University , 6-1 Kasugakoen , Kasuga-shi , Fukuoka 816-8580 , Japan.,Department of Molecular and Material Sciences, Interdisciplinary Graduate School of Engineering Sciences , Kyushu University , 6-1 Kasugakoen , Kasuga-shi , Fukuoka 816-8580 , Japan
| | - Yoichiro Kuninobu
- Institute for Materials Chemistry and Engineering , Kyushu University , 6-1 Kasugakoen , Kasuga-shi , Fukuoka 816-8580 , Japan.,Department of Molecular and Material Sciences, Interdisciplinary Graduate School of Engineering Sciences , Kyushu University , 6-1 Kasugakoen , Kasuga-shi , Fukuoka 816-8580 , Japan
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29
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Haydl AM, Hartwig JF. Palladium-Catalyzed Methylation of Aryl, Heteroaryl, and Vinyl Boronate Esters. Org Lett 2019; 21:1337-1341. [PMID: 30763109 DOI: 10.1021/acs.orglett.9b00025] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
A method for the direct methylation of aryl, heteroaryl, and vinyl boronate esters is reported, involving the reaction of iodomethane with aryl-, heteroaryl-, and vinylboronate esters catalyzed by palladium and PtBu2Me. This transformation occurs with a remarkably broad scope and is suitable for late-stage derivatization of biologically active compounds via the boronate esters. The unique capabilities of this method are demonstrated by combining carbon-boron bond-forming reactions with palladium-catalyzed methylation in a tandem transformation.
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Affiliation(s)
- Alexander M Haydl
- Department of Chemistry , University of California , Berkeley , California 94720 , United States
| | - John F Hartwig
- Department of Chemistry , University of California , Berkeley , California 94720 , United States
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30
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Dunn AL, Leitch DC, Journet M, Martin M, Tabet EA, Curtis NR, Williams G, Goss C, Shaw T, O’Hare B, Wade C, Toczko MA, Liu P. Selective Continuous Flow Iodination Guided by Direct Spectroscopic Observation of Equilibrating Aryl Lithium Regioisomers. Organometallics 2019. [DOI: 10.1021/acs.organomet.8b00538] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Anna L. Dunn
- API Chemistry, GlaxoSmithKline, King of Prussia, Pennsylvania 19406, United States
| | - David C. Leitch
- API Chemistry, GlaxoSmithKline, King of Prussia, Pennsylvania 19406, United States
| | - Michel Journet
- API Chemistry, GlaxoSmithKline, King of Prussia, Pennsylvania 19406, United States
| | - Michael Martin
- Early Development Sciences, GlaxoSmithKline, Research Triangle Park, North Carolina 27709, United States
| | - Elie A. Tabet
- Early Development Sciences, GlaxoSmithKline, Research Triangle Park, North Carolina 27709, United States
| | | | | | - Charles Goss
- Process Analytical Technologies, GlaxoSmithKline, King of Prussia, Pennsylvania 19406, United States
| | - Tony Shaw
- API Chemistry, GlaxoSmithKline, King of Prussia, Pennsylvania 19406, United States
| | - Bernie O’Hare
- Global Spectroscopy, GlaxoSmithKline, King of Prussia, Pennsylvania 19406, United States
| | - Charles Wade
- API Chemistry, GlaxoSmithKline, Stevenage, U.K. SG1 2NY
| | - Matthew A. Toczko
- Early Development Sciences, GlaxoSmithKline, Research Triangle Park, North Carolina 27709, United States
| | - Peng Liu
- API Chemistry, GlaxoSmithKline, King of Prussia, Pennsylvania 19406, United States
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31
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Fu Z, Jiang Y, Jiang L, Li Z, Guo S, Cai H. Cu-catalyzed decarboxylative iodination of aryl carboxylic acids with NaI: A practical entry to aryl iodides under aerobic conditions. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.11.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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32
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Kang H, Torruellas C, Liu J, Kozlowski MC. Total Synthesis of Chaetoglobin A via Catalytic, Atroposelective Oxidative Phenol Coupling. Org Lett 2018; 20:5554-5558. [PMID: 30207731 DOI: 10.1021/acs.orglett.8b02183] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The first total synthesis of chaetoglobin A (1), which features a chiral axis between two identical highly oxygenated bicyclic cores, was successfully completed in 12 steps from 2,6-dimethoxytoluene. Vanadium-catalyzed oxidative phenol coupling, as a key step, enabled generation of the axial chirality.
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Affiliation(s)
- Houng Kang
- Department of Chemistry, Roy and Diana Vagelos Laboratories , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Carilyn Torruellas
- U.S. Army Edgewood Chemical Biological Center , RDCB-DRC-P/Building E3400 , Aberdeen Proving Ground , Maryland 21010-5424 , United States
| | - Jinchu Liu
- Department of Process Research and Development , Merck Research Laboratories , Rahway , New Jersey 07065 , United States
| | - Marisa C Kozlowski
- Department of Chemistry, Roy and Diana Vagelos Laboratories , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
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33
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Dong CP, Nakamura K, Taniguchi T, Mita S, Kodama S, Kawaguchi SI, Nomoto A, Ogawa A, Mizuno T. Synthesis of Aryl Iodides from Arylhydrazines and Iodine. ACS OMEGA 2018; 3:9814-9821. [PMID: 31459110 PMCID: PMC6645010 DOI: 10.1021/acsomega.8b01559] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Accepted: 08/10/2018] [Indexed: 06/10/2023]
Abstract
A metal- and base-free method is developed for the synthesis of aryl iodides from arylhydrazine hydrochlorides and iodine. A wide variety of aryl iodides can be conveniently synthesized by an equimolar reaction of arylhydrazine hydrochlorides and I2 in dimethyl sulfoxide at 60 °C for 6 h. In the iodination step, arylhydrazines are oxidized by iodine to form arenediazonium salts, which undergo single-electron transfer from iodide anion to give aryl and iodine radicals; subsequent combination of them affords the corresponding aryl iodides.
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Affiliation(s)
- Chun-ping Dong
- Department of Applied
Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan
| | - Kentaro Nakamura
- Department of Applied
Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan
| | | | - Soichiro Mita
- Department of Applied
Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan
| | - Shintaro Kodama
- Department of Applied
Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan
| | - Shin-ichi Kawaguchi
- Center for Education
and Research in Agricultural Innovation, Faculty of Agriculture, Saga University, 152-1 Shonan-cho, Karatsu, Saga 847-0021, Japan
| | - Akihiro Nomoto
- Department of Applied
Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan
| | - Akiya Ogawa
- Department of Applied
Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Nakaku, Sakai, Osaka 599-8531, Japan
| | - Takumi Mizuno
- Morinomiya Center, Osaka Research Institute
of Industrial Science and Technology, 1-6-50 Morinomiya, Joto-ku, Osaka 536-8553, Japan
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34
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Mitra P, Eckenrode JM, Mandal A, Jha AK, Salem SM, Leggas M, Rohr J. Development of Mithramycin Analogues with Increased Selectivity toward ETS Transcription Factor Expressing Cancers. J Med Chem 2018; 61:8001-8016. [PMID: 30114371 DOI: 10.1021/acs.jmedchem.8b01107] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Mithramycin A (1) was identified as the top potential inhibitor of the aberrant ETS transcription factor EWS-FLI1, which causes Ewing sarcoma. Unfortunately, 1 has a narrow therapeutic window, compelling us to seek less toxic and more selective analogues. Here, we used MTMSA (2) to generate analogues via peptide coupling and fragment-based drug development strategies. Cytotoxicity assays in ETS and non-ETS dependent cell lines identified two dipeptide analogues, 60 and 61, with 19.1- and 15.6-fold selectivity, respectively, compared to 1.5-fold for 1. Importantly, the cytotoxicity of 60 and 61 is <100 nM in ETS cells. Molecular assays demonstrated the inhibitory capacity of these analogues against EWS-FLI1 mediated transcription in Ewing sarcoma. Structural analysis shows that positioning the tryptophan residue in a distal position improves selectivity, presumably via interaction with the ETS transcription factor. Thus, these analogues may present new ways to target transcription factors for clinical use.
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Affiliation(s)
- Prithiba Mitra
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Kentucky , Lee T. Todd, Jr. Building, 789 South Limestone Street , Lexington , Kentucky 40536-0596 , United States
| | - Joseph M Eckenrode
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Kentucky , Lee T. Todd, Jr. Building, 789 South Limestone Street , Lexington , Kentucky 40536-0596 , United States
| | - Abhisek Mandal
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Kentucky , Lee T. Todd, Jr. Building, 789 South Limestone Street , Lexington , Kentucky 40536-0596 , United States
| | - Amit K Jha
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Kentucky , Lee T. Todd, Jr. Building, 789 South Limestone Street , Lexington , Kentucky 40536-0596 , United States
| | - Shaimaa M Salem
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Kentucky , Lee T. Todd, Jr. Building, 789 South Limestone Street , Lexington , Kentucky 40536-0596 , United States
| | - Markos Leggas
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Kentucky , Lee T. Todd, Jr. Building, 789 South Limestone Street , Lexington , Kentucky 40536-0596 , United States
| | - Jürgen Rohr
- Department of Pharmaceutical Sciences, College of Pharmacy , University of Kentucky , Lee T. Todd, Jr. Building, 789 South Limestone Street , Lexington , Kentucky 40536-0596 , United States
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35
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Sloan NL, Luthra SK, McRobbie G, Pimlott SL, Sutherland A. A one-pot radioiodination of aryl amines via stable diazonium salts: preparation of 125I-imaging agents. Chem Commun (Camb) 2018; 53:11008-11011. [PMID: 28849815 DOI: 10.1039/c7cc06211g] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An operationally simple, one-pot, two-step tandem procedure that allows the incorporation of radioactive iodine into aryl amines via stable diazonium salts is described. The mild conditions are tolerant of various functional groups and substitution patterns, allowing late-stage, rapid access to a wide range of 125I-labelled aryl compounds and SPECT radiotracers.
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Affiliation(s)
- Nikki L Sloan
- WestCHEM, School of Chemistry, The Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, UK.
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36
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Narita M, Murafuji T, Yamashita S, Fujinaga M, Hiyama K, Oka Y, Tani F, Kamijo S, Ishiguro K. Synthesis of 2-Iodoazulenes by the Iododeboronation of Azulen-2-ylboronic Acid Pinacol Esters with Copper(I) Iodide. J Org Chem 2018; 83:1298-1303. [DOI: 10.1021/acs.joc.7b02820] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Masahiro Narita
- Graduate
School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Toshihiro Murafuji
- Graduate
School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8512, Japan
- Department
of Chemistry, Faculty of Science, Yamaguchi University, Yamaguchi 753-8512, Japan
- Graduate
School of Medicine, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Saki Yamashita
- Department
of Chemistry, Faculty of Science, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Masayuki Fujinaga
- Graduate
School of Medicine, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Kumiko Hiyama
- Graduate
School of Medicine, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Yurie Oka
- Graduate
School of Medicine, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Fumito Tani
- Institute
for Materials Chemistry and Engineering, Kyushu University, Fukuoka 819-0395, Japan
| | - Shin Kamijo
- Graduate
School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8512, Japan
- Department
of Chemistry, Faculty of Science, Yamaguchi University, Yamaguchi 753-8512, Japan
| | - Katsuya Ishiguro
- Graduate
School of Sciences and Technology for Innovation, Yamaguchi University, Yamaguchi 753-8512, Japan
- Department
of Chemistry, Faculty of Science, Yamaguchi University, Yamaguchi 753-8512, Japan
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37
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Wilson TC, Cailly T, Gouverneur V. Boron reagents for divergent radiochemistry. Chem Soc Rev 2018; 47:6990-7005. [DOI: 10.1039/c8cs00499d] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
This review discusses boron reagents as precursors for divergent radiolabelling with a focus on carbon-11, fluorine-18 and iodine-123, -125, -131.
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Affiliation(s)
| | - Thomas Cailly
- Normandie Univ
- UNICAEN
- Centre d’Etudes et de Recherche sur le Médicament de Normandie (CERMN)
- 14000 Caen
- France
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38
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Fu Z, Jiang L, Zuo Q, Li Z, Liu Y, Wei Z, Cai H. Inexpensive NaX (X = I, Br, Cl) as a halogen donor in the practical Ag/Cu-mediated decarboxylative halogenation of aryl carboxylic acids under aerobic conditions. Org Biomol Chem 2018; 16:5416-5421. [PMID: 30028462 DOI: 10.1039/c8ob01095a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Versatile and practical Ag/Cu-mediated decarboxylative halogenation between readily available aryl carboxylic acids and abundant NaX (X = I, Br, Cl) has been achieved under aerobic conditions in moderate to good yields. The halodecarboxylation is shown to be an effective strategy for S-containing heteroaromatic carboxylic acid and benzoic acids with nitro, chloro and methoxyl substituents at the ortho position. A gram-scale reaction and a three-step procedure to synthesize iniparib have been performed to evaluate the practicality of this protocol. A preliminary mechanistic investigation indicates that Cu plays a vital role and a radical pathway is involved in the transformation.
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Affiliation(s)
- Zhengjiang Fu
- College of Chemistry, Nanchang University, Nanchang, 330031, China.
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39
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Webster S, O'Rourke KM, Fletcher C, Pimlott SL, Sutherland A, Lee AL. Rapid Iododeboronation with and without Gold Catalysis: Application to Radiolabelling of Arenes. Chemistry 2017; 24:937-943. [PMID: 29105856 PMCID: PMC5814724 DOI: 10.1002/chem.201704534] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Indexed: 01/07/2023]
Abstract
Radiopharmaceuticals that incorporate radioactive iodine in combination with single‐photon emission computed tomography imaging play a key role in nuclear medicine, with applications in drug development and disease diagnosis. Despite this importance, there are relatively few general methods for the incorporation of radioiodine into small molecules. This work reports a rapid air‐ and moisture‐stable ipso‐iododeboronation procedure that uses NIS in the non‐toxic, green solvent dimethyl carbonate. The fast reaction and mild conditions of the gold‐catalysed method led to the development of a highly efficient process for the radiolabelling of arenes, which constitutes the first example of an application of homogenous gold catalysis to selective radiosynthesis. This was exemplified by the efficient synthesis of radiolabelled meta‐[125I]iodobenzylguanidine, a radiopharmaceutical that is used for the imaging and therapy of human norepinephrine transporter‐expressing tumours.
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Affiliation(s)
- Stacey Webster
- Institute of Chemical Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK
| | - Kerry M O'Rourke
- WestCHEM, School of Chemistry, The Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Conor Fletcher
- Institute of Chemical Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK
| | - Sally L Pimlott
- West of Scotland PET Centre, Greater Glasgow and Clyde NHS Trust, Glasgow, G12 0YN, UK
| | - Andrew Sutherland
- WestCHEM, School of Chemistry, The Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Ai-Lan Lee
- Institute of Chemical Sciences, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, UK
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40
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Xu L, Wang G, Zhang S, Wang H, Wang L, Liu L, Jiao J, Li P. Recent advances in catalytic C−H borylation reactions. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.11.005] [Citation(s) in RCA: 141] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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41
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Zhang J, Li S, Deng GJ, Gong H. Metal-Free, Oxidant-Free, and Controllable Graphene Oxide Catalyzed Direct Iodination of Arenes and Ketones. ChemCatChem 2017. [DOI: 10.1002/cctc.201701182] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Jingyu Zhang
- The Key Laboratory of Environmentally Friendly Chemistry, and Application of the Ministry of Education; College of Chemistry; Xiangtan University; Xiangtan 411105 P.R. China
| | - Shiguang Li
- The Key Laboratory of Environmentally Friendly Chemistry, and Application of the Ministry of Education; College of Chemistry; Xiangtan University; Xiangtan 411105 P.R. China
| | - Guo-Jun Deng
- The Key Laboratory of Environmentally Friendly Chemistry, and Application of the Ministry of Education; College of Chemistry; Xiangtan University; Xiangtan 411105 P.R. China
| | - Hang Gong
- The Key Laboratory of Environmentally Friendly Chemistry, and Application of the Ministry of Education; College of Chemistry; Xiangtan University; Xiangtan 411105 P.R. China
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42
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Reddy DM, Wang SC, Du K, Lee CF. Palladium-Catalyzed ortho–C-H Arylation of Acetophenone Oxime Ethers with Aryl Pinacol Boronic Esters. J Org Chem 2017; 82:10070-10076. [DOI: 10.1021/acs.joc.7b01524] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Shao-Chien Wang
- Department of Chemistry, National Chung Hsing University, Taichung, Taiwan 402, R.O.C
| | - Kai Du
- Department of Chemistry, National Chung Hsing University, Taichung, Taiwan 402, R.O.C
| | - Chin-Fa Lee
- Department of Chemistry, National Chung Hsing University, Taichung, Taiwan 402, R.O.C
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43
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Kim HS, Eom MS, Han MS, Lee S. Paper-Based Colorimetric Sensor System for High-Throughput Screening of C−H Borylation. Chemistry 2017; 23:6282-6285. [DOI: 10.1002/chem.201701256] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Han-Sung Kim
- Department of Chemistry; Chonnam National University; Gwangju 61186 Republic of Korea
| | - Min Sik Eom
- Department of Chemistry; Gwangju Institute of Science and Technology (GIST); Gwangju 61005 Republic of Korea
| | - Min Su Han
- Department of Chemistry; Gwangju Institute of Science and Technology (GIST); Gwangju 61005 Republic of Korea
| | - Sunwoo Lee
- Department of Chemistry; Chonnam National University; Gwangju 61186 Republic of Korea
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44
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Sloan N, Luthra SK, McRobbie G, Pimlott SL, Sutherland A. Late stage iodination of biologically active agents using a one-pot process from aryl amines. RSC Adv 2017. [DOI: 10.1039/c7ra11860k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A tandem process has been developed for the general preparation of aryl iodide compounds from anilines that is also applicable for the late-stage iodination of biologically active agents.
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Affiliation(s)
- Nikki L. Sloan
- WestCHEM
- School of Chemistry
- The Joseph Black Building
- University of Glasgow
- Glasgow G12 8QQ
| | | | | | - Sally L. Pimlott
- West of Scotland PET Centre
- Greater Glasgow and Clyde NHS Trust
- Glasgow G12 0YN
- UK
| | - Andrew Sutherland
- WestCHEM
- School of Chemistry
- The Joseph Black Building
- University of Glasgow
- Glasgow G12 8QQ
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45
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Chen TH, Reddy DM, Lee CF. A palladium-catalyzed oxidative cross-coupling reaction between aryl pinacol boronates and H-phosphonates in ethanol. RSC Adv 2017. [DOI: 10.1039/c7ra04619g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The first successful oxidative cross-coupling reaction of aryl phosphorous compounds started from pinacol aryl boronic esters is reported.
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Affiliation(s)
- Te-Hsuan Chen
- Department of Chemistry
- National Chung Hsing University
- Taichung
- Republic of China
| | | | - Chin-Fa Lee
- Department of Chemistry
- National Chung Hsing University
- Taichung
- Republic of China
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46
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Wilson TC, McSweeney G, Preshlock S, Verhoog S, Tredwell M, Cailly T, Gouverneur V. Radiosynthesis of SPECT tracers via a copper mediated 123I iodination of (hetero)aryl boron reagents. Chem Commun (Camb) 2016; 52:13277-13280. [PMID: 27775106 DOI: 10.1039/c6cc07417k] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/11/2024]
Abstract
A general method for the copper mediated nucleophilic 123I-iodination of (hetero)aryl boronic esters and acids has been developed. The broad substrate scope of this radiosynthetic approach allows access to [123I]DPA-713, [123I]IMPY, [123I]MIBG and [123I]IPEB that are four commonly used SPECT radiotracers. Our results infer that aryl boronic reagents can now be employed as common precursors for both fluorine-18 and iodine-123 radiolabelling.
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Affiliation(s)
- Thomas C Wilson
- Chemistry Research Laboratory, Department of Chemistry, Oxford University, OX1 3TA, UK.
| | - Greg McSweeney
- Chemistry Research Laboratory, Department of Chemistry, Oxford University, OX1 3TA, UK.
| | - Sean Preshlock
- Chemistry Research Laboratory, Department of Chemistry, Oxford University, OX1 3TA, UK.
| | - Stefan Verhoog
- Chemistry Research Laboratory, Department of Chemistry, Oxford University, OX1 3TA, UK.
| | - Matthew Tredwell
- Chemistry Research Laboratory, Department of Chemistry, Oxford University, OX1 3TA, UK. and Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, D-45470 Mülheim an der Ruhr, Germany
| | - Thomas Cailly
- Chemistry Research Laboratory, Department of Chemistry, Oxford University, OX1 3TA, UK. and Normandie University, UNICAEN, CERMN, F-14032 Caen, France
| | - Véronique Gouverneur
- Chemistry Research Laboratory, Department of Chemistry, Oxford University, OX1 3TA, UK.
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47
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Sharma KK, Patel DI, Jain R. Metal-free synthesis of N-fused heterocyclic iodides via C-H functionalization mediated by tert-butylhydroperoxide. Chem Commun (Camb) 2016; 51:15129-32. [PMID: 26323719 DOI: 10.1039/c5cc04013b] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Direct, regioselective and metal-free synthesis of fused N-heterocyclic iodides is reported. This regioselective C-H functionalization is mediated by tert-butylhydroperoxide (TBHP), via dual activation of molecular iodine and a heterocyclic substrate, resulting in the in situ generation of electrophilic iodine species (I(+)), and free radical(s) (t)BuO˙ or (t)BuOO˙, driving the iodination reaction.
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Affiliation(s)
- Krishna K Sharma
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research, Sector 67, S. A. S. Nagar, Punjab 160 062, India.
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48
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Chen X, Liu X, Martinez JS, Mohr JT. Practical regioselective halogenation of vinylogous esters: synthesis of differentiated mono-haloresorcinols and polyhalogenated resorcinols. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.02.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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49
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Chu L, Shang M, Tanaka K, Chen Q, Pissarnitski N, Streckfuss E, Yu JQ. Remote Meta-C-H Activation Using a Pyridine-Based Template: Achieving Site-Selectivity via the Recognition of Distance and Geometry. ACS CENTRAL SCIENCE 2015; 1:394-399. [PMID: 27162997 PMCID: PMC4827496 DOI: 10.1021/acscentsci.5b00312] [Citation(s) in RCA: 133] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Indexed: 06/01/2023]
Abstract
The pyridyl group has been extensively employed to direct transition-metal-catalyzed C-H activation reactions in the past half-century. The typical cyclic transition states involved in these cyclometalation processes have only enabled the activation of ortho-C-H bonds. Here, we report that pyridine is adapted to direct meta-C-H activation of benzyl and phenyl ethyl alcohols through engineering the distance and geometry of a directing template. This template takes advantage of a stronger σ-coordinating pyridine to recruit Pd catalysts to the desired site for functionalization. The U-shaped structure accommodates the otherwise highly strained cyclophane-like transition state. This development illustrates the potential of achieving site selectivity in C-H activation via the recognition of distal and geometric relationship between existing functional groups and multiple C-H bonds in organic molecules.
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Affiliation(s)
- Ling Chu
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Ming Shang
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Keita Tanaka
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
| | - Qinghao Chen
- Department of Process Chemistry and Department of Discovery Chemistry, Merck & Co. Inc., 126 East Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Natalya Pissarnitski
- Department of Process Chemistry and Department of Discovery Chemistry, Merck & Co. Inc., 126 East Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Eric Streckfuss
- Department of Process Chemistry and Department of Discovery Chemistry, Merck & Co. Inc., 126 East Lincoln Avenue, Rahway, New Jersey 07065, United States
| | - Jin-Quan Yu
- Department
of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, United States
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50
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Okamoto K, Sakata N, Ohe K. Copper-Catalyzed Cyanation of Aryl- and Alkenylboronic Reagents with Cyanogen Iodide. Org Lett 2015; 17:4670-3. [DOI: 10.1021/acs.orglett.5b01924] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Kazuhiro Okamoto
- Department
of Energy and
Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura,
Nishikyo-ku, Kyoto 615-8510, Japan
| | - Naoki Sakata
- Department
of Energy and
Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura,
Nishikyo-ku, Kyoto 615-8510, Japan
| | - Kouichi Ohe
- Department
of Energy and
Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura,
Nishikyo-ku, Kyoto 615-8510, Japan
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