1
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Gao C, Liu YZ, Wang YN, Zhang ZQ, Zhan ZP. Regioselective Synthesis of α-Quaternary Amino Acid Derivatives Enabled by Photoinduced Energy Transfer. J Org Chem 2024. [PMID: 38953569 DOI: 10.1021/acs.joc.4c01153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
α-Quaternary amino acids have found application in many biologically relevant compounds and pharmaceuticals. Although there are many methods for the synthesis of α-quaternary amino acids, most of them are mainly realized with the aid of transition metals and complex ligands. We present herein a 2,7-Br-4CzIPN catalyzed regioselective alkylation of azlactones with redox-active esters via radical-radical couplings. Strikingly, this approach is devoid of any metal or additive and shows broad scope and superior sensitive functional group compatibility.
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Affiliation(s)
- Cai Gao
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, Fujian, P. R. China
| | - Yan-Zhi Liu
- Gulei Innovation Institute, Xiamen University, Zhangzhou, 363100, Fujian, P. R. China
| | - Yan-Ni Wang
- Gulei Innovation Institute, Xiamen University, Zhangzhou, 363100, Fujian, P. R. China
| | - Zhen-Qiang Zhang
- Yunnan Precious Metals Laboratory Co., Ltd., Kunming, 650106, Yunnan, P. R. China
| | - Zhuang-Ping Zhan
- Department of Chemistry and Key Laboratory for Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, Fujian, P. R. China
- Gulei Innovation Institute, Xiamen University, Zhangzhou, 363100, Fujian, P. R. China
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2
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Shan QC, Wu YW, Chen MX, Zhao X, Loh TP, Hu XH. Synergistic Copper-Aminocatalysis for Direct Tertiary α-Alkylation of Ketones with Electron-Deficient Alkanes. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024:e2402255. [PMID: 38885363 DOI: 10.1002/advs.202402255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2024] [Revised: 05/17/2024] [Indexed: 06/20/2024]
Abstract
In this study, a novel approach for the tertiary α-alkylation of ketones using alkanes with electron-deficient C─H bonds is presented, employing a synergistic catalytic system combining inexpensive copper salts with aminocatalysis. This methodology addresses the limitations of traditional alkylation methods, such as the need for strong metallic bases, regioselectivity issues, and the risk of over alkylation, by providing a high reactivity and chemoselectivity without the necessity for pre-functionalized substrates. The dual catalytic strategy enables the direct functionalization of C(sp3)─H bonds, demonstrating remarkable selectivity in the presence of conventional C(sp3)─H bonds that are adjacent to heteroatoms or π systems, which are typically susceptible to single-electron transfer processes. The findings contribute to the advancement of alkylation techniques, offering a practical and efficient route for the construction of C(sp3)─C(sp3) bonds, and paving the way for further developments in the synthesis of complex organic molecules.
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Affiliation(s)
- Qi-Chao Shan
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, China
| | - You-Wei Wu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, China
| | - Mu-Xiang Chen
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, China
| | - Xuefei Zhao
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, China
| | - Teck-Peng Loh
- College of Advanced Interdisciplinary Science and Technology, Henan University of Technology, 100 Lianhua Street, Zhengzhou, 450001, China
- Division of Chemistry and Biological Chemistry, School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371, Singapore
| | - Xu-Hong Hu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing, 211816, China
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3
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Naskar G, Jeganmohan M. Pd(II)-catalyzed cyclization of 2-methyl aromatic ketones with maleimides through weak chelation assisted dual C-H activation. Chem Commun (Camb) 2024; 60:6284-6287. [PMID: 38809216 DOI: 10.1039/d4cc01651c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
A palladium-catalyzed dual C-H functionalization of substituted aromatic ketones and ester with maleimides leading to tricyclic heterocyclic molecules with good to excellent yield is reported. In this protocol, weak chelation of the carbonyl groups has been successfully utilized for the selective activation of the ortho-methyl C(sp3)-H bond instead of the ortho-C(sp2)-H bond in the presence of an external bidentate ligand Ac-Ile-OH. The reaction proceeds through two-fold C-H activation to generate a five-membered cyclic ring. The first C-H activation takes place selectively at the benzylic position followed by a second C-H bond activation at the meta position. The protocol demonstrates compatibility among diverse substituted aromatic ketones and ester as well as various substituted maleimides. Further derivatization of the tricyclic ketone to an alcohol exhibits the synthetic applicability of the protocol. Also, a plausible reaction mechanism has been proposed.
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Affiliation(s)
- Gouranga Naskar
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
| | - Masilamani Jeganmohan
- Department of Chemistry, Indian Institute of Technology Madras, Chennai 600036, India.
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4
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Kunchur HS, Sonawane SC, Saini P, Ramakrishnan S, Balakrishna MS. Copper(I) Complexes of Amide Functionalized Bisphosphine: Proximity Enhanced Metal-Ligand Cooperativity and Its Catalytic Advantage in C( sp3)-H Bond Activation of Unactivated Cycloalkanes in Dehydrogenative Carboxylation Reactions. Inorg Chem 2023. [PMID: 38031668 DOI: 10.1021/acs.inorgchem.3c01022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2023]
Abstract
The reactions of amide functionalized bisphosphine, o-Ph2PC6H4C-(O)N(H)C6H4PPh2-o (1) (BalaHariPhos), with copper salts is described. Treatment of 1 with CuX in a 1:1 molar ratio yielded chelate complexes of the type [CuX{(o-Ph2PC6H4C(O)N(H)C6H4PPh2-o)}-κ2-P,P] (X = Cl, 2; Br, 3; and I, 4), which on subsequent treatment with KOtBu resulted in a dimeric complex [Cu(o-Ph2PC6H4C(O)(N)C6H4PPh2-o)]2 (5). Interestingly, complexes 2-4 showed weak N-H···Cu interactions. These weak H-bonding interactions are studied in detail both experimentally and computationally. Also, CuI complexes 2-5 were employed in the oxidative dehydrogenative carboxylation (ODC) of unactivated cycloalkanes in the presence of carboxylic acids to form the corresponding allylic esters. Among complexes 2-5, halide-free dimeric CuI complex 5 showed excellent metal-ligand cooperativity in the oxidative dehydrogenative carboxylation (ODC) in the presence of carboxylic acids to form the corresponding allylic esters through C(sp3)-H bond activation of unactivated cycloalkanes. Mechanistic details of the catalytic process were established by isolating the precatalyst [Cu{(o-Ph2PC6H4C(O)(NH)C6H4PPh2-o)-κ2-P,P}(OOCPh)] (6) and fully characterized by mass spectrometry, NMR data, and single-crystal X-ray analysis. Density functional theory-based calculations further provided a quantitative understanding of the energetics of a series of H atom transfer steps occurring in the catalytic cycle.
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Affiliation(s)
- Harish S Kunchur
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Sachin C Sonawane
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Prateek Saini
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | | | - Maravanji S Balakrishna
- Phosphorus Laboratory, Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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5
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Zhang X, Wang D, Chang M, Wang W, Shen Z, Xu X. CuBr-mediated synthesis of 1,4-naphthoquinones via ring expansion of 2-aryl-1,3-indandiones. Chem Commun (Camb) 2023; 59:12326-12329. [PMID: 37753616 DOI: 10.1039/d3cc03753c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/28/2023]
Abstract
A CuBr-mediated direct insertion of alkenes into unstrained ring 2-aryl-1,3-indandiones is reported, which provides a one-carbon ring expansion strategy for the synthesis of 1,4-naphthoquinones. Entirely differing from the existing reports, the alkenes herein behave as C1 units to participate in annulation reactions. This transformation provides a facile route to access a class of highly functionalized 1,4-naphthoquinones with good yields, good functional-group tolerance and high atom-economy. Further research on the application of this reaction is currently underway in our laboratory.
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Affiliation(s)
- Xu Zhang
- College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China.
| | - Di Wang
- College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China.
| | - Mengfan Chang
- College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China.
| | - Wanya Wang
- College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China.
| | - Zhi Shen
- College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China.
| | - Xuefeng Xu
- College of Chemistry and Pharmaceutical Engineering, Nanyang Normal University, Nanyang 473061, China.
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6
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Li Y, Guo S, Li QH, Zheng K. Metal-free photoinduced C(sp 3)-H/C(sp 3)-H cross-coupling to access α‑tertiary amino acid derivatives. Nat Commun 2023; 14:6225. [PMID: 37802984 PMCID: PMC10558569 DOI: 10.1038/s41467-023-41956-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Accepted: 09/22/2023] [Indexed: 10/08/2023] Open
Abstract
The cross-dehydrogenative coupling (CDC) reaction is the most direct and efficient method for constructing α-tertiary amino acids (ATAAs), which avoids the pre-activation of C(sp3)-H substrates. However, the use of transition metals and harsh reaction conditions are still significant challenges for these reactions that urgently require solutions. This paper presents a mild, metal-free CDC reaction for the construction of ATAAs, which is compatible with various benzyl C-H substrates, functionalized C-H substrates, and alkyl substrates, with good regioselectivity. Notably, our method exhibits excellent functional group tolerance and late-stage applicability. According to mechanistic studies, the one-step synthesized and bench-stable N-alkoxyphtalimide generates a highly electrophilic trifluoro ethoxy radical that serves as a key intermediate in the reaction process and acts as a hydrogen atom transfer reagent. Therefore, our metal-free and additive-free method offers a promising strategy for the synthesis of ATAAs under mild conditions.
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Affiliation(s)
- Yujun Li
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, PR China
| | - Shaopeng Guo
- Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, College of Chemistry and Environment, Southwest Minzu University, Chengdu, PR China
| | - Qing-Han Li
- Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, College of Chemistry and Environment, Southwest Minzu University, Chengdu, PR China
| | - Ke Zheng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, PR China.
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7
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Sonego JM, de Diego SI, Szajnman SH, Gallo-Rodriguez C, Rodriguez JB. Organoselenium Compounds: Chemistry and Applications in Organic Synthesis. Chemistry 2023; 29:e202300030. [PMID: 37378970 DOI: 10.1002/chem.202300030] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 06/18/2023] [Accepted: 06/28/2023] [Indexed: 06/29/2023]
Abstract
Selenium, originally described as a toxin, turns out to be a crucial trace element for life that appears as selenocysteine and its dimer, selenocystine. From the point of view of drug developments, selenium-containing drugs are isosteres of sulfur and oxygen with the advantage that the presence of the selenium atom confers antioxidant properties and high lipophilicity, which would increase cell membrane permeation leading to better oral bioavailability. In this article, we have focused on the relevant features of the selenium atom, above all, the corresponding synthetic approaches to access a variety of organoselenium molecules along with the proposed reaction mechanisms. The preparation and biological properties of selenosugars, including selenoglycosides, selenonucleosides, selenopeptides, and other selenium-containing compounds will be treated. We have attempted to condense the most important aspects and interesting examples of the chemistry of selenium into a single article.
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Affiliation(s)
- Juan M Sonego
- Departamento de Química Orgánica Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos Aires, Argentina
- CONICET-Universidad de Buenos Aires, Unidad de Microanálisis y Métodos Físicos en Química Orgánica (UMYMFOR), C1428EHA, Buenos Aires, Argentina
| | - Sheila I de Diego
- Departamento de Química Orgánica Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos Aires, Argentina
- CONICET-Universidad de Buenos Aires, Unidad de Microanálisis y Métodos Físicos en Química Orgánica (UMYMFOR), C1428EHA, Buenos Aires, Argentina
| | - Sergio H Szajnman
- Departamento de Química Orgánica Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos Aires, Argentina
- CONICET-Universidad de Buenos Aires, Unidad de Microanálisis y Métodos Físicos en Química Orgánica (UMYMFOR), C1428EHA, Buenos Aires, Argentina
| | - Carola Gallo-Rodriguez
- Departamento de Química Orgánica Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos Aires, Argentina
- CONICET-Universidad de Buenos Aires, Centro de Investigaciones en Hidratos de Carbono (CIHIDECAR), C1428EHA, Buenos Aires, Argentina
| | - Juan B Rodriguez
- Departamento de Química Orgánica Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos Aires, Argentina
- CONICET-Universidad de Buenos Aires, Unidad de Microanálisis y Métodos Físicos en Química Orgánica (UMYMFOR), C1428EHA, Buenos Aires, Argentina
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8
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Zhu K, Ma Y, Wu Z, Wu J, Lu Y. Energy-Transfer-Enabled Regioconvergent Alkylation of Azlactones via Photocatalytic Radical–Radical Coupling. ACS Catal 2023. [DOI: 10.1021/acscatal.2c05698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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9
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Naskar G, Jeganmohan M. Palladium-Catalyzed [3 + 2] Annulation of Aromatic Amides with Maleimides through Dual C-H Activation. Org Lett 2023; 25:2190-2195. [PMID: 36966393 DOI: 10.1021/acs.orglett.3c00251] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/27/2023]
Abstract
A palladium-catalyzed [3 + 2] annulation of substituted aromatic amides with maleimides providing tricyclic heterocyclic molecules in good to moderate yields through weak carbonyl chelation is reported. The reaction proceeds via a dual C-H bond activation where the first C-H activation takes place selectively at the benzylic position followed by a second C-H bond activation at the meta position to afford a five-membered cyclic ring. An external ligand Ac-Gly-OH has been used to succeed in this protocol. A plausible reaction mechanism has been proposed for the [3 + 2] annulation reaction.
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Affiliation(s)
- Gouranga Naskar
- 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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10
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Shigeno M, Kajima A, Toyama E, Korenaga T, Yamakoshi H, Nozawa-Kumada K, Kondo Y. LiHMDS-Mediated Deprotonative Coupling of Toluenes with Ketones. Chemistry 2023; 29:e202203549. [PMID: 36479733 DOI: 10.1002/chem.202203549] [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: 11/15/2022] [Revised: 12/05/2022] [Accepted: 12/06/2022] [Indexed: 12/12/2022]
Abstract
We demonstrate that lithium hexamethyldisilazide (LiHMDS) acts as an effective base for deprotonative coupling reactions of toluenes with ketones to afford stilbenes. Various functionalities (halogen, OCF3 , amide, Me, aryl, alkenyl, alkynyl, SMe, and SPh) are allowed on the toluenes. Notably, this system proved successful with low-reactive toluenes bearing a large pKa value compared to that of the conjugate acid of LiHMDS (hexamethyldisilazane, 25.8, THF), as demonstrated by 4-phenyltoluene (38.57, THF) and toluene itself (∼43, DMSO).
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Affiliation(s)
- Masanori Shigeno
- Department of Biophysical Chemistry Graduate School of Pharmaceutical Science, Tohoku University, 6-3 Aoba, Sendai, 980-8578, Japan.,JST, PRESTO, Kawaguchi, Saitama, 332-0012, Japan
| | - Akihisa Kajima
- Department of Biophysical Chemistry Graduate School of Pharmaceutical Science, Tohoku University, 6-3 Aoba, Sendai, 980-8578, Japan
| | - Eito Toyama
- Department of Biophysical Chemistry Graduate School of Pharmaceutical Science, Tohoku University, 6-3 Aoba, Sendai, 980-8578, Japan
| | - Toshinobu Korenaga
- Department of Chemistry and Biological Sciences Faculty of Science and Engineering, Iwate University Ueda, Morioka, 020-8551, Japan.,Soft-Path Science and Engineering Research Center (SPERC), Iwate University, Ueda, Morioka, 020-8551, Japan
| | - Hiroyuki Yamakoshi
- Central Analytical Center, Graduate School of Pharmaceutical Science, Tohoku University, 6-3 Aoba, Sendai, 980-8578, Japan
| | - Kanako Nozawa-Kumada
- Department of Biophysical Chemistry Graduate School of Pharmaceutical Science, Tohoku University, 6-3 Aoba, Sendai, 980-8578, Japan
| | - Yoshinori Kondo
- Department of Biophysical Chemistry Graduate School of Pharmaceutical Science, Tohoku University, 6-3 Aoba, Sendai, 980-8578, Japan
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11
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Sugawara M, Sawamura M, Akakabe M, Ramadoss B, Sohtome Y, Sodeoka M. Pd-catalyzed Aerobic Cross-Dehydrogenative Coupling of Catechols with 2-Oxindoles and Benzofuranones: Reactivity Difference Between Monomer and Dimer. Chem Asian J 2022; 17:e202200807. [PMID: 36062560 PMCID: PMC9825984 DOI: 10.1002/asia.202200807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/05/2022] [Indexed: 01/11/2023]
Abstract
Persistent radicals, which are generated from 2-oxindole or benzofuranone dimers, are useful tools for designing the radical-based cross-coupling reaction to provide molecules containing a quaternary carbon. The persistent radical is accessible from both the dimer and monomer; however, the reactivity difference between these substrates for the oxidative cross-coupling reaction is not fully understood, most likely because of the mechanistic complexity. Here, we present details of an aerobic cross-dehydrogenative coupling (CDC) reaction using various monomers and catechols. UV-Vis analysis and mechanistic control experiments showed that the monomer is less reactive than the dimer under aerobic conditions. Our Pd(II)-BINAP-μ-hydroxo complex significantly improved the reactivity of the monomers for the aerobic CDC reaction with catechols, yielding results comparable to those of the corresponding dimer. The procedure, which enables the generation of the persistent radical in situ, is particularly useful when employing the monomer that is not readily converted to the corresponding dimer.
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Affiliation(s)
- Masumi Sugawara
- Synthetic Organic Chemistry LaboratoryRIKEN Cluster for Pioneering Research2-1 HirosawaWakoSaitamaJapan
| | - Miki Sawamura
- Synthetic Organic Chemistry LaboratoryRIKEN Cluster for Pioneering Research2-1 HirosawaWakoSaitamaJapan,Tokyo Medical and Dental UniversityTokyo113-8510Japan
| | - Mai Akakabe
- Synthetic Organic Chemistry LaboratoryRIKEN Cluster for Pioneering Research2-1 HirosawaWakoSaitamaJapan,Catalysis and Integrated Research Group RIKEN Center for Sustainable Resource Science
| | - Boobalan Ramadoss
- Catalysis and Integrated Research Group RIKEN Center for Sustainable Resource Science
| | - Yoshihiro Sohtome
- Synthetic Organic Chemistry LaboratoryRIKEN Cluster for Pioneering Research2-1 HirosawaWakoSaitamaJapan,Catalysis and Integrated Research Group RIKEN Center for Sustainable Resource Science
| | - Mikiko Sodeoka
- Synthetic Organic Chemistry LaboratoryRIKEN Cluster for Pioneering Research2-1 HirosawaWakoSaitamaJapan,Catalysis and Integrated Research Group RIKEN Center for Sustainable Resource Science,Tokyo Medical and Dental UniversityTokyo113-8510Japan
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12
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Li Y, Wu W, Zhu H, Kang Q, Xu L, Shi H. Rhodium‐Catalyzed Benzylic Addition Reactions of Alkylarenes to Michael Acceptors. Angew Chem Int Ed Engl 2022; 61:e202207917. [DOI: 10.1002/anie.202207917] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Yuntong Li
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province Department of Chemistry School of Science Westlake University 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
| | - Wen‐Qiang Wu
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province Department of Chemistry School of Science Westlake University 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
| | - Hui Zhu
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province Department of Chemistry School of Science Westlake University 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
| | - Qi‐Kai Kang
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province Department of Chemistry School of Science Westlake University 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
| | - Lun Xu
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province Department of Chemistry School of Science Westlake University 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
| | - Hang Shi
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province Department of Chemistry School of Science Westlake University 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
- Institute of Natural Sciences Westlake Institute for Advanced Study 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
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13
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Li Y, Wu W, Zhu H, Kang Q, Xu L, Shi H. Rhodium‐Catalyzed Benzylic Addition Reactions of Alkylarenes to Michael Acceptors. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202207917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yuntong Li
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province Department of Chemistry School of Science Westlake University 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
| | - Wen‐Qiang Wu
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province Department of Chemistry School of Science Westlake University 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
| | - Hui Zhu
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province Department of Chemistry School of Science Westlake University 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
| | - Qi‐Kai Kang
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province Department of Chemistry School of Science Westlake University 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
| | - Lun Xu
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province Department of Chemistry School of Science Westlake University 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
| | - Hang Shi
- Key Laboratory of Precise Synthesis of Functional Molecules of Zhejiang Province Department of Chemistry School of Science Westlake University 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
- Institute of Natural Sciences Westlake Institute for Advanced Study 18 Shilongshan Road Hangzhou 310024, Zhejiang Province China
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14
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Sreedharan R, Pal PK, Panyam PKR, Priyakumar UD, Gandhi T. Synthesis of α‐aryl ketones by harnessing the non‐innocence of toluene and its derivatives: Enhancing the acidity of methyl arenes by a Brønsted base and their mechanistic aspects. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200372] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ramdas Sreedharan
- Vellore Institute of Technology: VIT University Department of Chemistry, School of Advanced Sciences INDIA
| | - Pradeep Kumar Pal
- International Institute of Information Technology Hyderabad Centre for Computational Natural Sciences and Bioinformatics INDIA
| | - Pradeep Kumar Reddy Panyam
- Vellore Institute of Technology: VIT University Department of Chemistry, School of Advanced Sciences INDIA
| | - U Deva Priyakumar
- International Institute of Information Technology Hyderabad Centre for Computational Natural Sciences and Bioinformatics INDIA
| | - Thirumanavelan Gandhi
- VIT University Materials Chemistry Division, School of Advanced Sciences VIT University 632014 Vellore INDIA
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15
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Sim J, Ryou B, Choi M, Lee C, Park CM. Electrochemical C(sp 3)-H Functionalization of γ-Lactams Based on Hydrogen Atom Transfer. Org Lett 2022; 24:4264-4269. [PMID: 35675591 DOI: 10.1021/acs.orglett.2c01528] [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
We describe the electrochemical α-amidoalkylation of γ-lactams based on transition-metal-free cross-coupling via hydrogen atom transfer. The highly selective hydrogen atom transfer process allows for a broad substrate scope including both inter- and intramolecular reactions. Also, the construction of quaternary centers was realized by a double hydrogen atom transfer protocol to afford spirocycles. Detailed mechanistic studies including experimental and computational studies are provided to support the reaction pathway.
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Affiliation(s)
| | | | | | | | - Cheol-Min Park
- Department of Chemistry, Ulsan National Institute of Science & Technology (UNIST), Ulsan 44919, Korea
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16
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Nandi S, Mondal S, Jana R. Chemo- and regioselective benzylic C(sp3)–H oxidation bridging the gap between hetero- and homogeneous copper catalysis. iScience 2022; 25:104341. [PMID: 35602936 PMCID: PMC9118691 DOI: 10.1016/j.isci.2022.104341] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 04/09/2022] [Accepted: 04/26/2022] [Indexed: 11/25/2022] Open
Abstract
Selective C‒H functionalization in a pool of proximal C‒H bonds, predictably altering their innate reactivity is a daunting challenge. We disclose here, an expedient synthesis of privileged seven-membered lactones, dibenzo[c,e]oxepin-5(7H)-one through a highly chemoselective benzylic C(sp3)‒H activation. Remarkably, the formation of widely explored six-membered lactone via C(sp2)‒H activation is suppressed under the present conditions. The reaction proceeds smoothly on use of inexpensive metallic copper catalyst and di-tert-butyl peroxide (DTBP). Owing to the hazards of stoichiometric DTBP, further, we have developed a sustainable metallic copper/rose bengal dual catalytic system coupled with molecular oxygen replacing DTBP. A 1,5-aryl migration through Smiles rearrangement was realized from the corresponding diaryl ether substrates instead of expected eight-membered lactones. The present methodology is scalable, applied to the total synthesis of cytotoxic and neuroprotective natural product alterlactone. The catalyst is recyclable and the reaction can be performed in a copper bottle without any added catalyst. Catalytic strategy for chemo- and regioselective benzylic C–H activation Bulk copper catalysis merging with photocatalysis Reusable copper catalyst Reaction demonstrated in commercial copper bottle without external catalyst
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Affiliation(s)
- Shantanu Nandi
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Shuvam Mondal
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
| | - Ranjan Jana
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, Raja S. C. Mullick Road, Jadavpur, Kolkata 700032, West Bengal, India
- Corresponding author
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17
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Wang Y, Yang M, Lao C, Jiang Z. Potassium-Base-Mediated Autoxidative Diastereoselective Homocoupling of N-Acyl-2-aminoacetophenones. Org Lett 2022; 24:2625-2629. [PMID: 35380842 DOI: 10.1021/acs.orglett.2c00618] [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
We herein report a general and highly efficient method for the synthesis of dl-2,3-diamide-1,4-diones via autoxidative dehydrogenative homocoupling of N-acyl-2-aminoacetophenones mediated by t-BuOK. The transformation is mild, operationally simple, and environmentally friendly. Control experiments and stereochemical results suggest that the substrate undergoes autoxidation followed by a diastereoselective SN2 reactopm.
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Affiliation(s)
- Yingwei Wang
- State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau 999078, China
| | - Mingrong Yang
- State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau 999078, China
| | - Chichou Lao
- State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau 999078, China
| | - Zhihong Jiang
- State Key Laboratory of Quality Research in Chinese Medicines, Macau University of Science and Technology, Macau 999078, China
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18
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19
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Wei W, Zhao X. Organoselenium-Catalyzed Cross-Dehydrogenative Coupling of Alkenes and Azlactones. Org Lett 2022; 24:1780-1785. [DOI: 10.1021/acs.orglett.2c00117] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Wei Wei
- Institute of Organic Chemistry and MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510006, P. R. China
| | - Xiaodan Zhao
- Institute of Organic Chemistry and MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, Sun Yat-Sen University, Guangzhou 510006, P. R. China
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20
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Meng XH, Xu XC, Wang Z, Liang YX, Zhao YL. NaN(SiMe3)2/CsTFA Copromoted Aminobenzylation/Cyclization of 2-Isocyanobenzaldehydes with Toluene Derivatives or Benzyl Compounds: One-Pot Access to Dihydroquinazolines and Quinazolines. J Org Chem 2022; 87:3156-3166. [DOI: 10.1021/acs.joc.1c02890] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiang-He Meng
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Xue-Cen Xu
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Zhuo Wang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Yong-Xin Liang
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Yu-Long Zhao
- Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Faculty of Chemistry, Northeast Normal University, Changchun 130024, China
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21
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Cai C, Zou D. Recent Progress in Benzylic C(sp 3)—H Functionalization of Toluene and Its Derivatives. CHINESE J ORG CHEM 2022. [DOI: 10.6023/cjoc202201027] [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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22
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Gu Y, Zhang Z, Wang YE, Dai Z, Yuan Y, Xiong D, Li J, Walsh PJ, Mao J. Benzylic Aroylation of Toluenes Mediated by a LiN(SiMe 3) 2/Cs + System. J Org Chem 2021; 87:406-418. [PMID: 34958592 DOI: 10.1021/acs.joc.1c02446] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Chemoselective deprotonative functionalization of benzylic C-H bonds is challenging, because the arene ring contains multiple aromatic C(sp2)-H bonds, which can be competitively deprotonated and lead to selectivity issues. Recently it was found that bimetallic [MN(SiMe3)2 M = Li, Na]/Cs+ combinations exhibit excellent benzylic selectivity. Herein, is reported the first deprotonative addition of toluenes to Weinreb amides mediated by LiN(SiMe3)2/CsF for the synthesis of a diverse array of 2-arylacetophenones. Surprisingly, simple methyl benzoates also react with toluenes under similar conditions to form 2-arylacetophenones without double addition to give tertiary alcohol products. This finding greatly increases the practicality and impact of this chemistry. Some challenging substrates with respect to benzylic deprotonations, such as fluoro and methoxy substituted toluenes, are selectively transformed to 2-aryl acetophenones. The value of benzylic deprotonation of 3-fluorotoluene is demonstrated by the synthesis of a key intermediate in the preparation of Polmacoxib.
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Affiliation(s)
- Yuanyun Gu
- Technical Institute of Fluorochemistry (TIF), Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Zhen Zhang
- Technical Institute of Fluorochemistry (TIF), Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Yan-En Wang
- College of Science, Hebei Agricultural University, Baoding 071001, P. R. China
| | - Ziteng Dai
- Technical Institute of Fluorochemistry (TIF), Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Yaqi Yuan
- Technical Institute of Fluorochemistry (TIF), Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Dan Xiong
- Technical Institute of Fluorochemistry (TIF), Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - Jie Li
- Department of Pharmacy, School of Medicine, Zhejiang University City College, No. 48, Huzhou Road, Hangzhou 310015, P. R. China
| | - Patrick J Walsh
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, United States
| | - Jianyou Mao
- Technical Institute of Fluorochemistry (TIF), Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P. R. China
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23
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Ikeda T, Ochiishi H, Yoshida M, Yazaki R, Ohshima T. Catalytic Dehydrogenative β-Alkylation of Amino Acid Schiff Bases with Hydrocarbon. Org Lett 2021; 24:369-373. [PMID: 34918939 DOI: 10.1021/acs.orglett.1c04042] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A synthetic method for the synthesis of a highly congested α,β-dehydroamino acid through the β-C-H bond activation of an amino acid Schiff base is described. Abundant hydrocarbon feedstock could be used as an alkylating reagent to afford an α,β-dehydroamino acid bearing a quaternary carbon at the γ-position with an exclusively (Z)-geometry. Notably, a tetrasubstituted olefin could be constructed from saturated starting materials. The transformation of the synthesized α,β-dehydroamino acid into unnatural α-amino acid derivatives was also demonstrated.
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Affiliation(s)
- Tetsu Ikeda
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Haruka Ochiishi
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Mana Yoshida
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Ryo Yazaki
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Takashi Ohshima
- Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka 812-8582, Japan
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24
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Ghosh S, Patel S, Chatterjee I. Chain-walking reactions of transition metals for remote C-H bond functionalization of olefinic substrates. Chem Commun (Camb) 2021; 57:11110-11130. [PMID: 34611681 DOI: 10.1039/d1cc04370f] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Past several decades have witnessed the great evolution of inert C-H bond functionalization reactions as an emerging technique for synthesizing drug molecules, agrochemicals, and functional materials with intricate three-dimensional architectures. Although most activation of "unreactive" C-H bonds was accomplished by exploiting the power of transition metal catalysts, the distant and selective activation of unreactive C-H bonds in an undirected fashion remains one of the critical challenges to this rapidly growing field of organic chemistry. In this context, to meet all these concerns, much more attractive and challenging transition metal catalytic transformations have begun to blossom in recent years with the aid of the chain-walking process. The chain-walking strategy is one of the state-of-the-art techniques in organic synthesis to functionalize the unreactive C-H bonds by allowing the movement of a metal complex along the hydrocarbon chain of the substrate to recognize preferable bond-forming sites. The essential advantage of this strategy is that the bonds are formed only at the places where the catalyst selects for the specific C-H bonds to be cleaved, which not only avoids tedious synthetic procedures for prefunctionalization and the emission of undesirable wastes but also inspires chemists to plan novel synthetic strategies in a completely different manner. Consequently, various C-H bond functionalization reactions have been reported in recent years, employing the vast opportunity provided by this growing field mainly for the acyclic olefinic systems with flexible alkyl chains. Thus, chain-walking reactions allow the reactivity of the reaction centers within the substrates that cannot be realized via the classical mode of reactivity of the substrates. Applying this approach, inexpensive feedstock materials and simple hydrocarbons as an isomeric mixture can be converted to a single isomeric product in a regioconvergent scenario. Simultaneously, the site-selectivity of these reactions can also be switched using a regiodivergent strategy via appropriate tuning of ligands or a slight modification of reaction conditions. Herein, we have provided a comprehensive overview of the chain-walking reactions involving a variety of catalytic systems ranging from the first-row transition metal catalysts to the third-row transition metal catalysts for C-H activation in a concise fashion with the hope for further developments in this area through the appropriate application of the chain-walking reactions.
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Affiliation(s)
- Soumen Ghosh
- Department of Chemistry, Indian Institute of Technology Ropar, Nangal Road, Rupnagar, Punjab-140001, India.
| | - Sandeep Patel
- Department of Chemistry, Indian Institute of Technology Ropar, Nangal Road, Rupnagar, Punjab-140001, India.
| | - Indranil Chatterjee
- Department of Chemistry, Indian Institute of Technology Ropar, Nangal Road, Rupnagar, Punjab-140001, India.
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25
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Amadeo P, Bhaskararao B, Yang YF, Kozlowski MC. Inherent Selectivity of Pd C-H Activation from Different Metal Oxidation States. Organometallics 2021; 40:2290-2294. [PMID: 34690402 DOI: 10.1021/acs.organomet.1c00011] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In investigating potential control factors that would permit a palladium-catalyzed benzylic vs arene C-H activation as previously reported by our group, it was discovered that the oxidation state of the homogenous palladium species influences the selectivity of C-H activation. DFT calculations show that Pd0 and PdI preferentially activate the sp3 C-H bond in toluene, whereas PdII and PdIII preferentially activate the sp2 C-H bond. This selectivity appears to originate from the steric environment created by the ligand framework on the palladium. As the palladium oxidation state increases, the number of ligand sites increases, which decreases the energetic favorability for activation of the weaker, yet more hindered sp3 C-H bond.
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Affiliation(s)
- Peter Amadeo
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Bangaru Bhaskararao
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Yun-Fang Yang
- College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
| | - Marisa C Kozlowski
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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26
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Kerr WJ, Knox GJ, Reid M, Tuttle T. Catalyst design in C-H activation: a case study in the use of binding free energies to rationalise intramolecular directing group selectivity in iridium catalysis. Chem Sci 2021; 12:6747-6755. [PMID: 34040751 PMCID: PMC8132953 DOI: 10.1039/d1sc01509e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Remote directing groups in a bifunctional molecule do not always behave independently of one another in C-H activation chemistries. A combined DFT and experimental mechanistic study to provide enhanced Ir catalysts for chemoselective C-H deuteration of bifunctional aryl primary sulfonamides is described. This provides a pharmaceutically-relevant and limiting case study in using binding energies to predict intramolecular directing group chemoselectivity. Rational catalyst design, guided solely by qualitative substrate-catalyst binding free energy predictions, enabled intramolecular discrimination between competing ortho-directing groups in C-H activation and delivered improved catalysts for sulfonamide-selective C-H deuteration. As a result, chemoselective binding of the primary sulfonamide moiety was achieved in the face of an intrinsically more powerful pyrazole directing group present in the same molecule. Detailed DFT calculations and mechanistic experiments revealed a breakdown in the applied binding free energy model, illustrating the important interconnectivity of ligand design, substrate geometry, directing group cooperativity, and solvation in supporting DFT calculations. This work has important implications around attempts to predict intramolecular C-H activation directing group chemoselectivity using simplified monofunctional fragment molecules. More generally, these studies provide insights for catalyst design methods in late-stage C-H functionalisation.
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Affiliation(s)
- William J Kerr
- Department of Pure & Applied Chemistry, WestCHEM, University of Strathclyde Glasgow G1 1XL Scotland UK
| | - Gary J Knox
- Department of Pure & Applied Chemistry, WestCHEM, University of Strathclyde Glasgow G1 1XL Scotland UK
| | - Marc Reid
- Department of Pure & Applied Chemistry, WestCHEM, University of Strathclyde Glasgow G1 1XL Scotland UK
| | - Tell Tuttle
- Department of Pure & Applied Chemistry, WestCHEM, University of Strathclyde Glasgow G1 1XL Scotland UK
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27
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Sohtome Y, Kanomata K, Sodeoka M. Cross-Coupling Reactions of Persistent Tertiary Carbon Radicals. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20200376] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Yoshihiro Sohtome
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Kyohei Kanomata
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Mikiko Sodeoka
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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28
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Basnet P, Hong G, Hendrick CE, Kozlowski MC. Direct Oxidation of Aryl Malononitriles Enabling a Copper-Catalyzed Intermolecular Alkene Carbochlorination. Org Lett 2021; 23:433-437. [PMID: 33393785 DOI: 10.1021/acs.orglett.0c03941] [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
A copper-catalyzed carbochlorination of alkenes with aryl malononitriles and chloride is disclosed. This net oxidative transformation proceeds with activated and unactivated alkenes with moderate to excellent yields. Mechanism experiments suggest addition of the malononitrile radical to form a secondary carbon radical which is intercepted by a chloride source. The resultant products can be transformed into biologically important γ-lactones in one further step.
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Affiliation(s)
- Prakash Basnet
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Gang Hong
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Charles E Hendrick
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Marisa C Kozlowski
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
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29
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Wang H, Mao J, Shuai S, Chen S, Zou D, Walsh PJ, Li J. N-Acyl pyrroles: chemoselective pyrrole dance vs. C–H functionalization/aroylation of toluenes. Org Chem Front 2021. [DOI: 10.1039/d1qo00944c] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Chemoselectivity is one of the most challenging issues facing the chemical sciences.
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Affiliation(s)
- Huan Wang
- School of Pharmaceutical Sciences, Hangzhou Medical College, Hangzhou, Zhejiang 311399, China
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, P. R. China
| | - Jianyou Mao
- Technical Institute of Fluorochemistry (TIF), Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Nanjing Tech University, 30 South Puzhu Road, Nanjing 211816, P. R. China
| | - SuJuan Shuai
- School of Pharmaceutical Sciences, Hangzhou Medical College, Hangzhou, Zhejiang 311399, China
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, P. R. China
| | - Shuguang Chen
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, USA
| | - Dong Zou
- School of Pharmaceutical Sciences, Hangzhou Medical College, Hangzhou, Zhejiang 311399, China
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, P. R. China
| | - Patrick J. Walsh
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, USA
| | - Jie Li
- School of Pharmaceutical Sciences, Hangzhou Medical College, Hangzhou, Zhejiang 311399, China
- College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, P. R. China
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30
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Li Q, Liu W, Dang Y. Origins of ligand-controlled diastereoselectivity in dirhodium-catalysed direct amination of aliphatic C(sp 3)–H bonds. Catal Sci Technol 2021. [DOI: 10.1039/d1cy01583d] [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
DFT studies were used to explore the mechanism of ligand-controlled diastereoselectivity in Rh2-catalysed intramolecular C(sp3)–H aminations, and the stereoselectivities were revealed via distortion/interaction and noncovalent interaction analysis.
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Affiliation(s)
- Qiannan Li
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China
| | - Wenjing Liu
- Key Laboratory for Environmental Factors Control of Agro-product Quality Safety, Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Tianjin 300191, China
| | - Yanfeng Dang
- Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China
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31
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Wang M, Yang Y, Yin L, Feng Y, Li Y. Selective Synthesis of Pyrano[3,2- b]indoles or Cyclopenta[ b]indoles Tethered with Medium-Sized Rings via Cascade C-C σ-Bond Cleavage and C-H Functionalization. J Org Chem 2021; 86:683-692. [PMID: 33350835 DOI: 10.1021/acs.joc.0c02310] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Highly atom-economical tandem reactions have been developed for the synthesis of pyrano[3,2-b]indoles or cyclopenta[b]indoles tethered with 7-, 8-, or 9-membered rings. These reactions first undergo a carbon-carbon σ-bond cleavage reaction of cyclic β-ketoesters. Next, in the presence of CuCl2 and Ag2CO3, intramolecular O-H/C-H coupling occurs to give pyrano[3,2-b]indoles. This is the first example for capture of the enoloxyl radical of the intramolecular C-O bond formation reaction, whereas C3 nucleophilic addition afforded cyclopenta[b]indoles using TsOH·H2O.
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Affiliation(s)
- Mengdan Wang
- School of Chemistry and Molecular Engineering, East China Normal University 500 Dongchuan Road, Shanghai 200241, China
| | - Yajie Yang
- School of Chemistry and Molecular Engineering, East China Normal University 500 Dongchuan Road, Shanghai 200241, China
| | - Liqiang Yin
- School of Chemistry and Molecular Engineering, East China Normal University 500 Dongchuan Road, Shanghai 200241, China
| | - Ye Feng
- School of Chemistry and Molecular Engineering, East China Normal University 500 Dongchuan Road, Shanghai 200241, China
| | - Yanzhong Li
- School of Chemistry and Molecular Engineering, East China Normal University 500 Dongchuan Road, Shanghai 200241, China
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32
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Basnet P, Sebold MB, Hendrick CE, Kozlowski MC. Copper Catalyzed Oxidative Arylation of Tertiary Carbon Centers. Org Lett 2020; 22:9524-9528. [PMID: 33263410 DOI: 10.1021/acs.orglett.0c03581] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
We describe herein a Cu(OTf)2 catalyzed oxidative arylation of a tertiary carbon-containing substrate including aryl malononitriles, 3-aryl benzofuran-2-ones, and 3-aryl oxindoles. In some cases, the nitrile groups of the aryl malononitriles undergo further reactions leading to lactones or imines. These reaction conditions are applicable for a range of arenes, including phenols, anilines, anisoles, and heteroarenes. Mechanistic studies support the formation of a cationic intermediate via a two-electron oxidation.
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Affiliation(s)
- Prakash Basnet
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Melissa B Sebold
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Charles E Hendrick
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Marisa C Kozlowski
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
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33
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Zhang C, Qiu Y, Zhang J, Chen L, Xu S, Guo H, Luo J, Tan Y. CAN‐mediated Oxidative Coupling‐Reaction of Xanthenes with Enaminones. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000617] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Changyuan Zhang
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology College of Chemistry and Bio-engineering Yichun University 576 Xuefu Road Yichun 336000 P. R. China
| | - Yun Qiu
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology College of Chemistry and Bio-engineering Yichun University 576 Xuefu Road Yichun 336000 P. R. China
| | - Jiantao Zhang
- College of Chemistry Guangdong University of Petrochemical Technology Guandu Road Maoming 525000 P. R. China
| | - Lulu Chen
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology College of Chemistry and Bio-engineering Yichun University 576 Xuefu Road Yichun 336000 P. R. China
| | - Shuting Xu
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology College of Chemistry and Bio-engineering Yichun University 576 Xuefu Road Yichun 336000 P. R. China
| | - Huosheng Guo
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology College of Chemistry and Bio-engineering Yichun University 576 Xuefu Road Yichun 336000 P. R. China
| | - Jian Luo
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology College of Chemistry and Bio-engineering Yichun University 576 Xuefu Road Yichun 336000 P. R. China
| | - Yao Tan
- Key Laboratory of Jiangxi University for Applied Chemistry and Chemical Biology College of Chemistry and Bio-engineering Yichun University 576 Xuefu Road Yichun 336000 P. R. China
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34
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Sugawara M, Ohnishi R, Ezawa T, Akakabe M, Sawamura M, Hojo D, Hashizume D, Sohtome Y, Sodeoka M. Regiodivergent Oxidative Cross-Coupling of Catechols with Persistent tert-Carbon Radicals. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03986] [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]
Affiliation(s)
- Masumi Sugawara
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Rikako Ohnishi
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan
| | - Tetsuya Ezawa
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Mai Akakabe
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Miki Sawamura
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Daiki Hojo
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Daisuke Hashizume
- RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Yoshihiro Sohtome
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Mikiko Sodeoka
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Graduate School of Science and Engineering, Saitama University, 255 Shimo-okubo, Sakura-ku, Saitama 338-8570, Japan
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35
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Zou Y, Ni H, Dong H, Yang X, Chen L. A HClO
4
‐Catalyzed Substitutive Phosphorylation of Anthracene‐9‐ols with P(O)−H Compounds to Phosphorylated 9,10‐Dihydroanthracenes. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000385] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Yun‐Xiang Zou
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province Sichuan Industrial Institute of Antibiotics Chengdu University 168 Hua Guan Road Chengdu 610052 P. R. China
| | - Hai‐Liang Ni
- College of Chemistry and Materials Science Sichuan Normal University 5 Jing An Road Chengdu 610066 P. R. China
| | - Hong‐Bo Dong
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province Sichuan Industrial Institute of Antibiotics Chengdu University 168 Hua Guan Road Chengdu 610052 P. R. China
| | - Xin‐Yue Yang
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province Sichuan Industrial Institute of Antibiotics Chengdu University 168 Hua Guan Road Chengdu 610052 P. R. China
| | - Long Chen
- Antibiotics Research and Re-evaluation Key Laboratory of Sichuan Province Sichuan Industrial Institute of Antibiotics Chengdu University 168 Hua Guan Road Chengdu 610052 P. R. China
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36
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Ohnishi R, Sugawara M, Ezawa T, Sohtome Y, Sodeoka M. Formal Aerobic Oxidative Cross-Coupling of Benzofuranones with Azo Compounds Using Pd-μ-hydroxo Complex. Chem Pharm Bull (Tokyo) 2020; 68:895-898. [PMID: 32879230 DOI: 10.1248/cpb.c20-00359] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have developed a catalytic aerobic oxidative dimerization reaction of benzofuranones using a Pd(II)-µ-hydroxo complex. Radical-radical cross-coupling of the resulting dimers with azo compounds enabled the one-pot synthesis of structurally congested benzofuranones having two distinct vicinal all-carbon quaternary centers.
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Affiliation(s)
- Rikako Ohnishi
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research.,Graduate School of Science and Engineering, Saitama University
| | - Masumi Sugawara
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research
| | - Tetsuya Ezawa
- Catalysis and Integrated Research Group, RIKEN Center for Sustainable Resource Science
| | - Yoshihiro Sohtome
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research.,Catalysis and Integrated Research Group, RIKEN Center for Sustainable Resource Science
| | - Mikiko Sodeoka
- Synthetic Organic Chemistry Laboratory, RIKEN Cluster for Pioneering Research.,Graduate School of Science and Engineering, Saitama University.,Catalysis and Integrated Research Group, RIKEN Center for Sustainable Resource Science
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37
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Corpas J, Viereck P, Chirik PJ. C(sp2)–H Activation with Pyridine Dicarbene Iron Dialkyl Complexes: Hydrogen Isotope Exchange of Arenes Using Benzene-d6 as a Deuterium Source. ACS Catal 2020. [DOI: 10.1021/acscatal.0c01714] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Javier Corpas
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
- Department of Organic Chemistry, Universidad Autónoma de Madrid, Calle Francisco Tomás y Valiente 7, Cantoblanco, 28049 Madrid, Spain
| | - Peter Viereck
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Paul J. Chirik
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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38
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Tsuji T, Tanaka T, Tanaka T, Yazaki R, Ohshima T. Catalytic Aerobic Cross-Dehydrogenative Coupling of Azlactones en Route to α,α-Disubstituted α-Amino Acids. Org Lett 2020; 22:4164-4170. [PMID: 32396012 DOI: 10.1021/acs.orglett.0c01248] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We developed a catalytic aerobic method to synthesize α,α-disubstituted α-amino acids through cross-dehydrogenative coupling of azlactones. Combining an iron catalyst with a bisoxazolidine ligand resulted in high catalytic performance, and cross-coupling with an indole proceeded smoothly under aerobic conditions. A wide variety of α-aryl and aliphatic amino acid derived azlactones were applied to the present catalysis. In addition, a quaternary carbon could be constructed using oxindole and benzofuranone under aerobic conditions.
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Affiliation(s)
- Taro Tsuji
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Takafumi Tanaka
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Tsukushi Tanaka
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Ryo Yazaki
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Takashi Ohshima
- Graduate School of Pharmaceutical Sciences, Kyushu University, Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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39
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Hong G, Nahide PD, Kozlowski MC. Cyanomethylation of Substituted Fluorenes and Oxindoles with Alkyl Nitriles. Org Lett 2020; 22:1563-1568. [PMID: 32043885 DOI: 10.1021/acs.orglett.0c00160] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The first example of metal-free cyanomethylenation from alkyl nitriles of sp3 C-H bonds to afford quaternary carbon centers is described. This oxidative protocol is operationally simple and features good functional group compatibility. This method provides a novel approach to highly functionalized fluorene and oxindole derivatives, which are commonly used in material and pharmaceutical areas. Control experiments provide evidence of a radical reaction process.
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Affiliation(s)
- Gang Hong
- Department of Chemistry, Roy and Diana Vagelos Laboratories , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , United States
| | - Pradip D Nahide
- Department of Chemistry, Roy and Diana Vagelos Laboratories , University of Pennsylvania , Philadelphia , Pennsylvania 19104 , 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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40
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Wang Q, Chen X, Li G, Chen Q, Yang YF, She YB. Computational Exploration of Chiral Iron Porphyrin-Catalyzed Asymmetric Hydroxylation of Ethylbenzene Where Stereoselectivity Arises from π-π Stacking Interaction. J Org Chem 2019; 84:13755-13763. [PMID: 31599588 DOI: 10.1021/acs.joc.9b01989] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The mechanism and origins of stereoselectivity of chiral iron porphyrin-catalyzed asymmetric hydroxylation of ethylbenzene were explored with density functional theory. The hydrogen atom abstraction is the rate- and stereoselectivity-determining step. In good agreement with experimental results, the formation of the (R)-1-phenylethanol product is found to be the most favorable pathway. The transition state of hydrogen atom abstraction which leads to the (S)-1-phenylethanol product is unfavorable by 1.7 kcal/mol compared to the corresponding transition state which leads to the (R)-1-phenylethanol product. Enantioselectivity arises from an attractive π-π stacking interaction between the phenyl group of ethylbenzene substrate and the naphthyl group of the porphyrin ligand.
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Affiliation(s)
- Qunmin Wang
- College of Chemical Engineering , Zhejiang University of Technology , Hangzhou , Zhejiang 310014 , China
| | - Xiahe Chen
- College of Chemical Engineering , Zhejiang University of Technology , Hangzhou , Zhejiang 310014 , China
| | - Guijie Li
- College of Chemical Engineering , Zhejiang University of Technology , Hangzhou , Zhejiang 310014 , China
| | - Qidong Chen
- College of Chemical Engineering , Zhejiang University of Technology , Hangzhou , Zhejiang 310014 , China
| | - Yun-Fang Yang
- College of Chemical Engineering , Zhejiang University of Technology , Hangzhou , Zhejiang 310014 , China
| | - Yuan-Bin She
- College of Chemical Engineering , Zhejiang University of Technology , Hangzhou , Zhejiang 310014 , China
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41
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Yazaki R, Ohshima T. Recent strategic advances for the activation of benzylic C–H bonds for the formation of C–C bonds. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.151225] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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42
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Liu G, Walsh PJ, Mao J. Alkaline-Metal-Catalyzed One-Pot Aminobenzylation of Aldehydes with Toluenes. Org Lett 2019; 21:8514-8518. [PMID: 31542933 DOI: 10.1021/acs.orglett.9b02737] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel and easily accessible MN(SiMe3)2 (M = Li or Na)/Cs2CO3 co-catalyzed benzylation of in situ generated N-(trimethylsilyl) aldimines with toluene derivatives has been successfully developed. The catalyst exhibits high chemoselectivity for deprotonation of toluenes at the benzylic position. The utility of this system is exemplified by the one-pot synthesis of a diverse array of bioactive 1,2-diarylethylamines with excellent efficiency and broad functional group tolerance.
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Affiliation(s)
- Guoqing Liu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials , Nanjing Tech University , 30 South Puzhu Road , Nanjing 211816 , P.R. China
| | - Patrick J Walsh
- Roy and Diana Vagelos Laboratories, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States
| | - Jianyou Mao
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials , Nanjing Tech University , 30 South Puzhu Road , Nanjing 211816 , P.R. China
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43
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Ohnishi R, Sugawara M, Akakabe M, Ezawa T, Koshino H, Sohtome Y, Sodeoka M. Cross‐Coupling Reaction of Dimer‐Derived Persistent Tertiary‐Carbon‐Centered Radicals with Azo Compounds. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900300] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Rikako Ohnishi
- Synthetic Organic Chemistry LaboratoryRIKEN Cluster for Pioneering Research 2-1 Hirosawa, Wako Saitama Japan
- Graduate School of Science and EngineeringSaitama University 255 Shimo-okubo, Sakura-ku Saitama Japan
| | - Masumi Sugawara
- Synthetic Organic Chemistry LaboratoryRIKEN Cluster for Pioneering Research 2-1 Hirosawa, Wako Saitama Japan
| | - Mai Akakabe
- Synthetic Organic Chemistry LaboratoryRIKEN Cluster for Pioneering Research 2-1 Hirosawa, Wako Saitama Japan
| | - Tetsuya Ezawa
- Catalysis and Integrated Research Group RIKEN Center for Sustainable Resource Science 2-1 Hirosawa, Wako Saitama Japan
| | - Hiroyuki Koshino
- Synthetic Organic Chemistry LaboratoryRIKEN Cluster for Pioneering Research 2-1 Hirosawa, Wako Saitama Japan
- Molecular Structure Characterization UnitTechnology Platform Division RIKEN Center for Sustainable Resource Science 2-1 Hirosawa, Wako Saitama Japan
| | - Yoshihiro Sohtome
- Synthetic Organic Chemistry LaboratoryRIKEN Cluster for Pioneering Research 2-1 Hirosawa, Wako Saitama Japan
- Catalysis and Integrated Research Group RIKEN Center for Sustainable Resource Science 2-1 Hirosawa, Wako Saitama Japan
| | - Mikiko Sodeoka
- Synthetic Organic Chemistry LaboratoryRIKEN Cluster for Pioneering Research 2-1 Hirosawa, Wako Saitama Japan
- Catalysis and Integrated Research Group RIKEN Center for Sustainable Resource Science 2-1 Hirosawa, Wako Saitama Japan
- Graduate School of Science and EngineeringSaitama University 255 Shimo-okubo, Sakura-ku Saitama Japan
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44
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Chuentragool P, Kurandina D, Gevorgyan V. Catalysis with Palladium Complexes Photoexcited by Visible Light. Angew Chem Int Ed Engl 2019; 58:11586-11598. [PMID: 30600875 DOI: 10.1002/anie.201813523] [Citation(s) in RCA: 150] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Indexed: 01/24/2023]
Abstract
Palladium catalysis induced by visible light is an emerging field of catalysis. In contrast to classical reactions catalyzed by Pd complexes in the ground state, which mostly proceed through two-electron redox processes, the mechanisms of these new methods based on photoexcited Pd complexes usually operate through transfer of a single electron. Such processes lead to putative hybrid Pd/radical species, which exhibit both radical and classical Pd-type reactivity. This Minireview highlights the recent progress in this rapidly growing area.
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Affiliation(s)
- Padon Chuentragool
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois, 60607-7061, USA
| | - Daria Kurandina
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois, 60607-7061, USA
| | - Vladimir Gevorgyan
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois, 60607-7061, USA
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45
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Chuentragool P, Kurandina D, Gevorgyan V. Katalyse mit durch sichtbares Licht angeregten Palladiumkomplexen. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201813523] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Padon Chuentragool
- Department of Chemistry University of Illinois at Chicago 845 West Taylor Street Chicago Illinois 60607-7061 USA
| | - Daria Kurandina
- Department of Chemistry University of Illinois at Chicago 845 West Taylor Street Chicago Illinois 60607-7061 USA
| | - Vladimir Gevorgyan
- Department of Chemistry University of Illinois at Chicago 845 West Taylor Street Chicago Illinois 60607-7061 USA
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46
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Huang W, Li X, Song X, Luo Q, Li Y, Dong Y, Liang D, Wang B. Benzylarylation of N-Allyl Anilines: Synthesis of Benzylated Indolines. J Org Chem 2019; 84:6072-6083. [PMID: 31021621 DOI: 10.1021/acs.joc.9b00237] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
An unprecedented benzylic C-H functionalization of methyl arenes across unactivated alkenes is presented. In the presence of MnCl2·4H2O and di- tert-butyl peroxide, N-allyl anilines underwent benzylation/cyclization cascade to give benzylated indolines, which are a previously unmet synthetic goal. This protocol features simple operation, broad substrate scope, and great exo selectivity.
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Affiliation(s)
- Wenzhong Huang
- Department of Chemistry , Kunming University , Kunming 650214 , China
| | - Xiulan Li
- Department of Chemistry , Kunming University , Kunming 650214 , China
| | - Xuemei Song
- Department of Chemistry , Kunming University , Kunming 650214 , China
| | - Qing Luo
- Department of Chemistry , Kunming University , Kunming 650214 , China
| | - Yanping Li
- Department of Chemistry , Kunming University , Kunming 650214 , China
| | - Ying Dong
- College of Chemistry, Chemical Engineering and Materials Science , Shandong Normal University , Jinan 250014 , China
| | - Deqiang Liang
- Department of Chemistry , Kunming University , Kunming 650214 , China.,Yunnan Engineering Technology Research Center for Plastic Films , Kunming 650214 , China
| | - Baoling Wang
- Department of Chemistry , Kunming University , Kunming 650214 , China.,Yunnan Engineering Technology Research Center for Plastic Films , Kunming 650214 , China
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47
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Hong G, Nahide PD, Neelam UK, Amadeo P, Vijeta A, Curto JM, Hendrick CE, VanGelder KF, Kozlowski MC. Palladium-Catalyzed Chemoselective Activation of sp 3 vs sp 2 C-H Bonds: Oxidative Coupling To Form Quaternary Centers. ACS Catal 2019; 9:3716-3724. [PMID: 31777683 DOI: 10.1021/acscatal.9b00091] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The oxidative activation of alkyl C-H bonds vs arene C-H bonds with Pd(OAc)2 has been found to be generalizable to a number of nucleophilic substrates allowing the formation of a range of hindered quaternary centers. The substrates share a common mechanistic path wherein Pd(II) initiates an oxidative dimerization. The resultant dimer modifies the palladium catalyst to favor activation of alkyl C-H bonds in contrast to the trends typically observed via a concerted metalation deprotonation mechanism. Notably, insertion occurs at the terminus of the alkyl arene for hindered substrates. Two different oxidant systems were discovered that turn over the process. Parameters have been identified that predict, which substrates are productive in this reaction.
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Affiliation(s)
- Gang Hong
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
- Key Laboratory for Advanced Materials, Institute of Fine Chemicals and School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, P. R. China
| | - Pradip D. Nahide
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Uday Kumar Neelam
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Peter Amadeo
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Arjun Vijeta
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - John M. Curto
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Charles E. Hendrick
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Kelsey F. VanGelder
- Department of Chemistry, Roy and Diana Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104, 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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48
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Jiang H, Sha SC, Jeong SA, Manor BC, Walsh PJ. Ni(NIXANTPHOS)-Catalyzed Mono-Arylation of Toluenes with Aryl Chlorides and Bromides. Org Lett 2019; 21:1735-1739. [PMID: 30838860 DOI: 10.1021/acs.orglett.9b00294] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A nickel-catalyzed cross-coupling of toluene derivatives with both aryl bromides and chlorides using a NIXANTPHOS-ligated nickel(II) complex has been developed. The key factor to success is proposed to be the catalyst activation of toluene by a cation-π complex, enabling methyl arenes (p Ka ≈ 43) to be deprotonated with the relatively mild base NaN(SiMe3)2. This method facilitates access to a variety of sterically and electronically diverse hetero- and nonheteroaryl-containing diarylmethanes.
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Affiliation(s)
- Hui Jiang
- Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States
| | - Sheng-Chun Sha
- Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States
| | - Soo A Jeong
- Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States
| | - Brian C Manor
- Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States
| | - Patrick J Walsh
- Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, Department of Chemistry , University of Pennsylvania , 231 South 34th Street , Philadelphia , Pennsylvania 19104-6323 , United States
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49
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Lin HC, Xie PP, Dai ZY, Zhang SQ, Wang PS, Chen YG, Wang TC, Hong X, Gong LZ. Nucleophile-Dependent Z/E- and Regioselectivity in the Palladium-Catalyzed Asymmetric Allylic C–H Alkylation of 1,4-Dienes. J Am Chem Soc 2019; 141:5824-5834. [DOI: 10.1021/jacs.8b13582] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hua-Chen Lin
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Pei-Pei Xie
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Zhen-Yao Dai
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Shuo-Qing Zhang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Pu-Sheng Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Yu-Gen Chen
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Tian-Ci Wang
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
| | - Xin Hong
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Liu-Zhu Gong
- Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
- Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, China
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50
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Arndt P, Reiß M, Spannenberg A, Schünemann C, Reiß F, Beweries T. A general benzylic C–H activation and C–C coupling reaction of zirconocenes mediated by C–N bond cleavage in tert-butylisocyanide – unusual formation of iminoacyl complexes. Dalton Trans 2019; 48:16525-16533. [DOI: 10.1039/c9dt03120k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reactions of the zirconocene alkyne complex [rac-(ebthi)Zr(η2-Me3SiC2SiMe3)] (rac-(ebthi) = rac-1,2-ethylene-1,1′-bis(η5-tetrahydroindenyl)) with tert-butylisocyanide and methylbenzenes were investigated.
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Affiliation(s)
- Perdita Arndt
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- Rostock
- Germany
| | - Melanie Reiß
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- Rostock
- Germany
| | - Anke Spannenberg
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- Rostock
- Germany
| | - Claas Schünemann
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- Rostock
- Germany
| | - Fabian Reiß
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- Rostock
- Germany
| | - Torsten Beweries
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock
- Rostock
- Germany
| |
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