1
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Elavarasan S, Preety J, Kesavan M, Patel RB, Baskar B. Activation of enamine by photoexcited organocatalyst assisted singlet oxygen: synthesis of oxazoles and quinoxalines. Org Biomol Chem 2024; 22:4912-4921. [PMID: 38808593 DOI: 10.1039/d4ob00609g] [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
Herein, a novel transition-metal-free thiol-based donor-acceptor organophotocatalyst-assisted, singlet-oxygen-mediated tandem oxidative cyclization for the synthesis of substituted oxazoles in moderate-to-good yields is described. The developed method demonstrates applicability for the synthesis of various substituted quinoxalines in good-to-excellent yields. The metal-free methodology shows a practical route for the synthesis of oxazole and quinoxaline derivatives, which are privileged moieties prevalent in various biologically active compounds and natural products. To the best of our knowledge, both the thiol photocatalyst and synthesis of oxazoles by visible-light irradiation are reported for the first time.
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Affiliation(s)
- Selvaraj Elavarasan
- Laboratory of Sustainable Synthesis, Department of Chemistry, SRM Institute of Science and Technology, Kattankulatur, 603 203, Chengalpet (Dt), Tamilnadu, India.
| | - Jeyaraj Preety
- Laboratory of Sustainable Synthesis, Department of Chemistry, SRM Institute of Science and Technology, Kattankulatur, 603 203, Chengalpet (Dt), Tamilnadu, India.
| | - M Kesavan
- Interdisciplinary Institute of Indian System of Medicine (IIISM), SRM Institute of Science and Technology, Kattankulatur, 603 203, Chengalpet (Dt), Tamilnadu, India
| | - Ravi B Patel
- Graduate School of Pharmacy, Gujarat Technological University, Ghandhinagar Campus, Ghandhinagar - 382028, Gujarat, India
| | - Baburaj Baskar
- Laboratory of Sustainable Synthesis, Department of Chemistry, SRM Institute of Science and Technology, Kattankulatur, 603 203, Chengalpet (Dt), Tamilnadu, India.
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2
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Jiang Y, Liu X, Li W, Jiao X, Xie P. Total Synthesis of (-)-Levesquamide. J Org Chem 2023; 88:3981-3986. [PMID: 36862134 DOI: 10.1021/acs.joc.2c03066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
The total synthesis of levesquamide, a natural product with an unprecedented pentasubstituted pyridine-isothiazolinone skeleton, has been accomplished from kojic acid for the first time. The key features of the synthesis include a Suzuki coupling reaction between bromopyranone and oxazolyl borate fragments, a copper-mediated introduction of a thioether, a mild hydrolysis of a pyridine 2-N-methoxyamide, and a Pummerer-type cyclization of a tert-butyl sulfoxide to form the key pyridine-isothiazolinone unit of the natural product.
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Affiliation(s)
- Yingjun Jiang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Xiaoyu Liu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Wenxuan Li
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Xiaozhen Jiao
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
| | - Ping Xie
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Beijing Key Laboratory of Active Substances Discovery and Druggability Evaluation, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100050, China
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3
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Gaykar RN, Deswal S, Guin A, Bhattacharjee S, Biju AT. Synthesis of Trisubstituted Oxazoles via Aryne Induced [2,3] Sigmatropic Rearrangement-Annulation Cascade. Org Lett 2022; 24:4145-4150. [PMID: 35666528 DOI: 10.1021/acs.orglett.2c01379] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A transition-metal-free, [2,3] sigmatropic rearrangement-annulation cascade of 2-substituted thio/amino acetonitriles with arynes allowing the synthesis of 2,4,5-trisubstituted oxazoles under mild conditions has been demonstrated. The key sulfur/nitrogen ylides were generated by the initial S/N arylation followed by proton transfer, which was followed by the selective [2,3] sigmatropic rearrangement involving the -CN moiety and a subsequent annulation to afford the desired products in reasonable yields.
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Affiliation(s)
- Rahul N Gaykar
- Department of Organic Chemistry, Indian Institute of Science, Bangalore-560012, India
| | - Shiksha Deswal
- Department of Organic Chemistry, Indian Institute of Science, Bangalore-560012, India
| | - Avishek Guin
- Department of Organic Chemistry, Indian Institute of Science, Bangalore-560012, India
| | - Subrata Bhattacharjee
- Department of Organic Chemistry, Indian Institute of Science, Bangalore-560012, India
| | - Akkattu T Biju
- Department of Organic Chemistry, Indian Institute of Science, Bangalore-560012, India
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4
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Lozano C, Ramirez C, Sin N, Viart HF, Prusiner SB, Paras NA, Conrad J. Silver Benzoate Facilitates the Copper-Catalyzed C-N Coupling of Iodoazoles with Aromatic Nitrogen Heterocycles. ACS OMEGA 2021; 6:9804-9812. [PMID: 33869960 PMCID: PMC8047741 DOI: 10.1021/acsomega.1c00458] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 02/25/2021] [Indexed: 06/12/2023]
Abstract
In the literature, C-N coupling methods for the reaction of iodo-oxazole with 2-pyridinone were found to be low yielding. C-N coupling using silver benzoate additives with CuI catalysts and 4,7-dimethoxy-1,10-phenanthroline ligands has been developed to afford synthetically useful yields of the desired heterobicycle product. The reaction conditions are applied to the coupling of a range of iodo-heterocycles with 2-pyridinone. The coupling of a variety of NH-containing heterocycles with 4-iodo-oxazole is also demonstrated. The use of 2-, 4-, or 5-iodo-oxazole allows for the coupling of pyridinone to each oxazole position.
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Affiliation(s)
- Cedric Lozano
- Institute
for Neurodegenerative Diseases, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States
| | - Cristian Ramirez
- Institute
for Neurodegenerative Diseases, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States
| | - Ny Sin
- Institute
for Neurodegenerative Diseases, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States
- Department
of Neurology, Weill Institute for Neurosciences, University of California San Francisco, San Francisco 94158, California, United States
| | - Hélène
M.-F. Viart
- Institute
for Neurodegenerative Diseases, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States
- Department
of Neurology, Weill Institute for Neurosciences, University of California San Francisco, San Francisco 94158, California, United States
| | - Stanley B. Prusiner
- Institute
for Neurodegenerative Diseases, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States
- Department
of Neurology, Weill Institute for Neurosciences, University of California San Francisco, San Francisco 94158, California, United States
- Department
of Biochemistry and Biophysics, University
of California San Francisco, San
Francisco, California 94158, United States
| | - Nick A. Paras
- Institute
for Neurodegenerative Diseases, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States
- Department
of Neurology, Weill Institute for Neurosciences, University of California San Francisco, San Francisco 94158, California, United States
| | - Jay Conrad
- Institute
for Neurodegenerative Diseases, Weill Institute for Neurosciences, University of California San Francisco, San Francisco, California 94158, United States
- Department
of Neurology, Weill Institute for Neurosciences, University of California San Francisco, San Francisco 94158, California, United States
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5
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Wu D, Lu Y, Hao W, Tu S, Jiang B. Synthesis of Fully Substituted Oxazoles via an NFSI/KF‐Mediated Double Bond Cleavage‐Rearrangement Cascade. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202000627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Dan Wu
- School of Chemistry and Materials Science Jiangsu Normal University Xuzhou 221116 P. R. China
| | - Yi Lu
- School of Chemistry and Materials Science Jiangsu Normal University Xuzhou 221116 P. R. China
| | - Wen‐Juan Hao
- School of Chemistry and Materials Science Jiangsu Normal University Xuzhou 221116 P. R. China
| | - Shu‐Jiang Tu
- School of Chemistry and Materials Science Jiangsu Normal University Xuzhou 221116 P. R. China
| | - Bo Jiang
- School of Chemistry and Materials Science Jiangsu Normal University Xuzhou 221116 P. R. China
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6
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Wang K, Pan X, Peng K, Liu ZZ. Regioselective bromination of
6‐hydroxytetrahydroisoquinolines. J Heterocycl Chem 2020. [DOI: 10.1002/jhet.4121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ke Wang
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica Peking Union Medical College and Chinese Academy of Medical Sciences Beijing PR China
| | - Xuan Pan
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica Peking Union Medical College and Chinese Academy of Medical Sciences Beijing PR China
| | - Kun Peng
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica Peking Union Medical College and Chinese Academy of Medical Sciences Beijing PR China
| | - Zhan Z. Liu
- State Key Laboratory of Bioactive Substances and Functions of Natural Medicines, Institute of Materia Medica Peking Union Medical College and Chinese Academy of Medical Sciences Beijing PR China
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7
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Bhaskaran S, Padusha MSA, Sajith AM. Application of Palladium Based Precatalytic Systems in the Suzuki‐Miyaura Cross‐Coupling Reactions of Chloro‐ Heterocycles. ChemistrySelect 2020. [DOI: 10.1002/slct.202002357] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Savitha Bhaskaran
- Postgraduate and Research Department of ChemistryJamal Mohamed College, Bharathidasan University Tiruchirappalli India
| | - M. Syed Ali Padusha
- Postgraduate and Research Department of ChemistryJamal Mohamed College, Bharathidasan University Tiruchirappalli India
| | - Ayyiliath M Sajith
- Ortin laboratories Pvt. Ltd, Malkapur VillageChoutuppal Mandal, Hyderabad Telangana India- 508252
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8
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Yang S, Yang Y, Li F, Liu X. NIS-TBHP promoted oxidative coupling of C N and C O bonds: A metal-free approach to polysubstituted oxazoles. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.151846] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Liu J, Dong Y, Li G, Min X, Hussain M. Unexpected intramolecular nucleophilic cyclization of ureidoacetamide: A novel route towards the synthesis of 2,4,5-trisubsituted oxazoles. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.05.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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10
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Pan J, Li X, Qiu X, Luo X, Jiao N. Copper-Catalyzed Oxygenation Approach to Oxazoles from Amines, Alkynes, and Molecular Oxygen. Org Lett 2018; 20:2762-2765. [PMID: 29664305 DOI: 10.1021/acs.orglett.8b00992] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A novel and efficient oxygenation approach to trisubstituted oxazoles via a copper-catalyzed aerobic oxidative dehydrogenative annulation of amines, alkynes, and O2 has been developed. This transformation combines dioxygen activation and oxidative C-H bond functionalization and provides a practical protocol for the preparation of oxazole derivatives, which are privileged units found in various bioactive compounds or other natural products. 18O-labeling experiments were conducted to reveal that oxygenation was involved in this chemistry.
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Affiliation(s)
- Jun Pan
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Xinyao Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Xu Qiu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Xiao Luo
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Ning Jiao
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China.,Shanghai Key Laboratory of Green Chemistry and Chemical Processes , East China Normal University , Shanghai 200062 , China
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11
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Yang W, Zhang R, Yi F, Cai M. A Heterogeneous Gold(I)-Catalyzed [2 + 2 + 1] Annulation of Terminal Alkynes, Nitriles, and Oxygen Atoms Leading to 2,5-Disubstituted Oxazoles. J Org Chem 2017; 82:5204-5211. [PMID: 28459566 DOI: 10.1021/acs.joc.7b00386] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first heterogeneous gold(I)-catalyzed [2 + 2 + 1] annulation of terminal alkynes, nitriles, and oxygen atoms has been achieved by using an MCM-41-immobilized phosphine-gold(I) complex as catalyst and 8-methylquinoline N-oxide as oxidant under mild conditions, yielding a variety of 2,5-disubstituted oxazoles in good to excellent yields with broad substrate scope. The new heterogeneous gold(I) catalyst can easily be recovered by simple filtration of the reaction solution and recycled for at least eight times without significant loss of activity.
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Affiliation(s)
- Weisen Yang
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University , Nanchang 330022, P. R. China.,College of Ecology and Resources Engineering, Wuyi University , Wuyishan City 354300, P. R. China
| | - Rongli Zhang
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University , Nanchang 330022, P. R. China
| | - Feiyan Yi
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University , Nanchang 330022, P. R. China
| | - Mingzhong Cai
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University , Nanchang 330022, P. R. China
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12
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13
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Li JL, Wang YC, Li WZ, Wang HS, Mo DL, Pan YM. A facile synthesis of 2,5-disubstituted oxazoles via a copper-catalyzed cascade reaction of alkenes with azides. Chem Commun (Camb) 2015; 51:17772-4. [DOI: 10.1039/c5cc06487b] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A novel approach to the synthesis of 2,5-disubstituted oxazoles is developed via a 1,3-dipolar cycloaddition/ring cleavage/1,2-H migration/denitrogenation/copper-catalyzed aerobic oxidative dehydrogenative cyclization cascade.
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Affiliation(s)
- Jiu-ling Li
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China)
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
| | - Ying-chun Wang
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China)
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
- College of Chemistry and Chemical Engineering
| | - Wei-ze Li
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China)
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
| | - Heng-shan Wang
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China)
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
| | - Dong-liang Mo
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China)
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
| | - Ying-ming Pan
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China)
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
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14
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Akula M, Thigulla Y, Davis C, Jha M, Bhattacharya A. Synthesis of 4-substituted oxazolo[4,5-c]quinolines by direct reaction at the C-4 position of oxazoles. Org Biomol Chem 2015; 13:2600-5. [DOI: 10.1039/c4ob02224f] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cu(TFA)2 catalysed synthesis of 4-arylsubstituted oxazolo[4,5-c]quinolines/[1,8] naphthyridines has been described via a modified Pictet–Spengler method, without prefunctionalization of the unreactive 4th position of oxazoles.
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Affiliation(s)
- Mahesh Akula
- Department of Chemistry
- Birla Institute of Technology and Science-Pilani (Hyderabad Campus)
- Hyderabad-500078
- India
| | - Yadagiri Thigulla
- Department of Chemistry
- Birla Institute of Technology and Science-Pilani (Hyderabad Campus)
- Hyderabad-500078
- India
| | - Connor Davis
- Department of Biology and Chemistry
- Nipissing University
- North Bay
- Canada P1B 8L7
| | - Mukund Jha
- Department of Biology and Chemistry
- Nipissing University
- North Bay
- Canada P1B 8L7
| | - Anupam Bhattacharya
- Department of Chemistry
- Birla Institute of Technology and Science-Pilani (Hyderabad Campus)
- Hyderabad-500078
- India
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15
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Zhao X, Ding F, Li J, Lu K, Lu X, Wang B, Yu P. Direct C–H iodination of 1,3-azoles catalysed by CuBr 2. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2014.12.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Fan YS, Das U, Hsiao MY, Liu MH, Lin W. Chemoselective Intramolecular Wittig Reactions for the Synthesis of Oxazoles and Benzofurans. J Org Chem 2014; 79:11567-82. [DOI: 10.1021/jo502232q] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yu-Shiou Fan
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, R.O.C
| | - Utpal Das
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, R.O.C
| | - Ming-Yu Hsiao
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, R.O.C
| | - Meng-Hsien Liu
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, R.O.C
| | - Wenwei Lin
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, R.O.C
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17
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Chobanian HR, Guo Y, Liu P, Chioda MD, Fung S, Lanza TJ, Chang L, Bakshi RK, Dellureficio JP, Hong Q, McLaughlin M, Belyk KM, Krska SW, Makarewicz AK, Martel EJ, Leone JF, Frey L, Karanam B, Madeira M, Alvaro R, Shuman J, Salituro G, Terebetski JL, Jochnowitz N, Mistry S, McGowan E, Hajdu R, Rosenbach M, Abbadie C, Alexander JP, Shiao LL, Sullivan KM, Nargund RP, Wyvratt MJ, Lin LS, DeVita RJ. Discovery of MK-4409, a Novel Oxazole FAAH Inhibitor for the Treatment of Inflammatory and Neuropathic Pain. ACS Med Chem Lett 2014; 5:717-21. [PMID: 24944750 DOI: 10.1021/ml5001239] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2014] [Accepted: 04/10/2014] [Indexed: 11/28/2022] Open
Abstract
We report herein the identification of MK-4409, a potent and selective fatty acid amide hydrolase (FAAH) inhibitor. Starting from a high throughput screening (HTS) hit, medicinal chemistry efforts focused on optimizing of FAAH inhibition in vitro potency, improving the pharmacokinetic (PK) profile, and increasing in vivo efficacy in rodent inflammatory and neuropathic pain assays.
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Affiliation(s)
- Harry R. Chobanian
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Yan Guo
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Ping Liu
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Marc D. Chioda
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Selena Fung
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Thomas J. Lanza
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Linda Chang
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Raman K. Bakshi
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - James P. Dellureficio
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Qingmei Hong
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Mark McLaughlin
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Kevin M. Belyk
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Shane W. Krska
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Amanda K. Makarewicz
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Elliot J. Martel
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Joseph F. Leone
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Lisa Frey
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Bindhu Karanam
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Maria Madeira
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Raul Alvaro
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Joyce Shuman
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Gino Salituro
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Jenna L. Terebetski
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Nina Jochnowitz
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Shruti Mistry
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Erin McGowan
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Richard Hajdu
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Mark Rosenbach
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Catherine Abbadie
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Jessica P. Alexander
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Lin-Lin Shiao
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Kathleen M. Sullivan
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Ravi P. Nargund
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Matthew J. Wyvratt
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Linus S. Lin
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
| | - Robert J. DeVita
- Departments of Medicinal
Chemistry, ‡Process Chemistry, §Drug Metabolism and Pharmacokinetics, ∥Preclinical Development, ⊥Pharmacology, and ○Immunology, Merck Research Laboratories, Kenilworth, New Jersey 07033, United States
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18
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Khose G, Shinde S, Panmand A, Kulkarni R, Munot Y, Bandyopadhyay A, Barawkar D, Patil SN. Synthesis of substituted esters of imidazoles, oxazoles, thiazoles, and diethyl pyrazine-2,5-dicarboxylate from a common acyclic precursor employing C-formylation strategy. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.03.039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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19
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Haldón E, Besora M, Cano I, Cambeiro XC, Pericàs MA, Maseras F, Nicasio MC, Pérez PJ. Reaction of Alkynes and Azides: Not Triazoles Through Copper-Acetylides but Oxazoles Through Copper-Nitrene Intermediates. Chemistry 2014; 20:3463-74. [DOI: 10.1002/chem.201303737] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Indexed: 12/20/2022]
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20
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Yuan G, Zhu Z, Gao X, Jiang H. Electrochemically promoted synthesis of polysubstituted oxazoles from β-diketone derivatives and benzylamines under mild conditions. RSC Adv 2014. [DOI: 10.1039/c4ra03865g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An efficient electrochemical route has been developed to synthesize polysubstituted oxazoles, without the use of hazardous oxidants and transition metal catalysts.
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Affiliation(s)
- Gaoqing Yuan
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou, China
| | - Zechen Zhu
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou, China
| | - Xiaofang Gao
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou, China
| | - Huanfeng Jiang
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou, China
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21
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Naresh G, Narender T. Molecular iodine mediated synthesis of polysubstituted oxazoles by oxidative domino cyclization in water. RSC Adv 2014. [DOI: 10.1039/c4ra00501e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A simple and efficient iodine-mediated domino protocol has been developed to construct polysubstituted oxazoles through the C-heteroatom bond formation in water from readily available β-ketoesters and primary amines in high yields.
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Affiliation(s)
- Gunaganti Naresh
- CSIR-Central Drug Research Institute
- Medicinal and Process Chemistry Division
- , India
| | - Tadigoppula Narender
- CSIR-Central Drug Research Institute
- Medicinal and Process Chemistry Division
- , India
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22
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Chen X, Zhou L, Li Y, Xie T, Zhou S. Synthesis of Heteroaryl Compounds through Cross-Coupling Reaction of Aryl Bromides or Benzyl Halides with Thienyl and Pyridyl Aluminum Reagents. J Org Chem 2013; 79:230-9. [DOI: 10.1021/jo4024123] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xu Chen
- Laboratory of Functionalized Molecular
Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Lingmin Zhou
- Laboratory of Functionalized Molecular
Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Yimei Li
- Laboratory of Functionalized Molecular
Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Tao Xie
- Laboratory of Functionalized Molecular
Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
| | - Shuangliu Zhou
- Laboratory of Functionalized Molecular
Solids, Ministry of Education, Anhui Laboratory of Molecule-Based
Materials, College of Chemistry and Materials Science, Anhui Normal University, Wuhu, Anhui 241000, China
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23
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Xue WJ, Zhang W, Zheng KL, Dai Y, Guo YQ, Li HZ, Gao FF, Wu AX. Formation of 2-Acyloxazoles by a Multipathway Coupled Domino Strategy: One-Pot Metal-Free Oxidative Cyclization Applicable to Various Substrates. ASIAN J ORG CHEM 2013. [DOI: 10.1002/ajoc.201300124] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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24
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Li Y, Guo F, Zha Z, Wang Z. Metal-free synthesis of polysubstituted oxazoles via a decarboxylative cyclization from primary α-amino acids. ACTA ACUST UNITED AC 2013. [DOI: 10.1186/2043-7129-1-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Abstract
Background
The ubiquitous oxazoles have attracted more and more attention in both industrial and academic fields for decades. This interest arises from the fact that a variety of natural and synthetic compounds which contain the oxazole substructure exhibit significant biological activities and antiviral properties. Although various synthetic methodologies for synthesis of oxazols have been reported, the development of milder and more general procedure to access oxazoles is still desirable.
Results
In this manuscript, a novel method for synthesis of polysubstituted oxazoles was developed from metal-free decarboxylative cyclization of easily available primary α-amino acids with 2-bromoacetophenones.
Conclusions
The method was simple, and this reaction could be carried out smoothly under mild and metal-free conditions. By virtue of this method, various polysubstituted oxazoles were obtained from the primary α-amino acids with moderate yields.
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25
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Yugandar S, Acharya A, Ila H. Synthesis of 2,5-Bis(hetero)aryl 4′-Substituted 4,5′-Bisoxazoles via Copper(I)-Catalyzed Domino Reactions of Activated Methylene Isocyanides with 2-Phenyl- and 2-(2-Thienyl)-4-[(aryl/heteroaryl)(methylthio)methylene]oxazol-5(4H)-ones. J Org Chem 2013; 78:3948-60. [DOI: 10.1021/jo400317g] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Somaraju Yugandar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur,
Bangalore-50064, India
| | - Anand Acharya
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur,
Bangalore-50064, India
| | - Hiriyakkanavar Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur,
Bangalore-50064, India
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26
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Eftekhari-Sis B, Zirak M, Akbari A. Arylglyoxals in Synthesis of Heterocyclic Compounds. Chem Rev 2013; 113:2958-3043. [DOI: 10.1021/cr300176g] [Citation(s) in RCA: 228] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Bagher Eftekhari-Sis
- Department of Chemistry, Faculty
of Science, University of Maragheh, Golshahr,
P.O. Box. 55181-83111, Maragheh, Iran
| | - Maryam Zirak
- Department of Chemistry, Payame Noor University, P.O. Box 19395-3697, Tehran,
Iran
| | - Ali Akbari
- Department of Chemistry, Faculty
of Science, University of Maragheh, Golshahr,
P.O. Box. 55181-83111, Maragheh, Iran
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27
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Tsai YL, Fan YS, Lee CJ, Huang CH, Das U, Lin W. An efficient synthesis of trisubstituted oxazoles via chemoselective O-acylations and intramolecular Wittig reactions. Chem Commun (Camb) 2013; 49:10266-8. [DOI: 10.1039/c3cc45883k] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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28
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Metal-free dual sp3 C–H functionalization: I2-promoted domino oxidative cyclization to construct 2,5-disubstituted oxazoles. Tetrahedron 2013. [DOI: 10.1016/j.tet.2012.10.072] [Citation(s) in RCA: 71] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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29
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Vijay Kumar S, Saraiah B, Misra NC, Ila H. Synthesis of 2-Phenyl-4,5-Substituted Oxazoles by Copper-Catalyzed Intramolecular Cyclization of Functionalized Enamides. J Org Chem 2012; 77:10752-63. [DOI: 10.1021/jo3021192] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- S. Vijay Kumar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur,
Bangalore-560064, Karnataka, India
| | - B. Saraiah
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur,
Bangalore-560064, Karnataka, India
| | - N. C. Misra
- Department of Chemistry, Indian Institute of Technology, Kanpur-208016, Uttar
Pradesh, India
| | - H. Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur,
Bangalore-560064, Karnataka, India
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30
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I2/TBHP-mediated domino process: a convenient route to 1,3-oxazole derivatives. RESEARCH ON CHEMICAL INTERMEDIATES 2012. [DOI: 10.1007/s11164-012-0885-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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31
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Lin H, Dong X, Li Y, Shen Q, Lu L. Highly Selective Activation of Vinyl C-S Bonds Over Aryl C-S Bonds in the Pd-Catalyzed Coupling of (E)-(β-Trifluoromethyl)vinyldiphenylsulfonium Salts: Preparation of Trifluoromethylated Alkenes and Dienes. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200758] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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32
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Literature Survey Part A: Transition Metal-Catalyzed Reactions. MICROWAVES IN ORGANIC AND MEDICINAL CHEMISTRY 2012. [DOI: 10.1002/9783527647828.ch5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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33
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Amatore C, Jutand A, Le Duc G. Mechanistic origin of antagonist effects of usual anionic bases (OH-, CO3(2-)) as modulated by their countercations (Na+, Cs+, K+) in palladium-catalyzed Suzuki-Miyaura reactions. Chemistry 2012; 18:6616-25. [PMID: 22511514 DOI: 10.1002/chem.201200516] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Indexed: 11/11/2022]
Abstract
The mechanism of the reaction of trans-ArPdBrL(2) (Ar=p-Z-C(6)H(4), Z=CN, H; L=PPh(3)) with Ar'B(OH)(2) (Ar'=p-Z'-C(6)H(4), Z'=H, CN, MeO), which is a key step in the Suzuki-Miyaura process, has been established in N,N-dimethylformamide (DMF) with two bases, acetate (nBu(4)NOAc) or carbonate (Cs(2)CO(3)) and compared with that of hydroxide (nBu(4)NOH), reported in our previous work. As anionic bases are inevitably introduced with a countercation M(+) (e.g., M(+)OH(-)), the role of cations in the transmetalation/reductive elimination has been first investigated. Cations M(+) (Na(+), Cs(+), K(+)) are not innocent since they induce an unexpected decelerating effect in the transmetalation via their complexation to the OH ligand in the reactive ArPd(OH)L(2), partly inhibiting its transmetalation with Ar'B(OH)(2). A decreasing reactivity order is observed when M(+) is associated with OH(-): nBu(4)N(+) > K(+) > Cs(+) > Na(+). Acetates lead to the formation of trans-ArPd(OAc)L(2), which does not undergo transmetalation with Ar'B(OH)(2). This explains why acetates are not used as bases in Suzuki-Miyaura reactions that involve Ar'B(OH)(2). Carbonates (Cs(2)CO(3)) give rise to slower reactions than those performed from nBu(4)NOH at the same concentration, even if the reactions are accelerated in the presence of water due to the generation of OH(-). The mechanism of the reaction with carbonates is then similar to that established for nBu(4)NOH, involving ArPd(OH)L(2) in the transmetalation with Ar'B(OH)(2). Due to the low concentration of OH(-) generated from CO(3)(2-) in water, both transmetalation and reductive elimination result slower than those performed from nBu(4)NOH at equal concentrations as Cs(2)CO(3). Therefore, the overall reactivity is finely tuned by the concentration of the common base OH(-) and the ratio [OH(-)]/[Ar'B(OH)(2)]. Hence, the anionic base (pure OH(-) or OH(-) generated from CO(3)(2-)) associated with its countercation (Na(+), Cs(+), K(+)) plays four antagonist kinetic roles: acceleration of the transmetalation by formation of the reactive ArPd(OH)L(2), acceleration of the reductive elimination, deceleration of the transmetalation by formation of unreactive Ar'B(OH)(3)(-) and by complexation of ArPd(OH)L(2) by M(+).
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Affiliation(s)
- Christian Amatore
- Département de Chimie, Ecole Normale Supérieure, UMR CNRS-ENS-UPMC 8640, 24 Rue Lhomond, 75231 Paris Cedex 5, France.
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34
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Zhong CL, Tang BY, Yin P, Chen Y, He L. Synthesis of 2,5-Disubstituted Oxazoles and Oxazolines Catalyzed by Ruthenium(II) Porphyrin and Simple Copper Salts. J Org Chem 2012; 77:4271-7. [PMID: 22436032 DOI: 10.1021/jo202663n] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chuan Long Zhong
- Key Laboratory of Drug-Targeting
and Drug-Delivery Systems of the Ministry of Education, Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University,
Chengdu, Sichuan, 610041, P. R. China
| | - Bo Yang Tang
- Key Laboratory of Drug-Targeting
and Drug-Delivery Systems of the Ministry of Education, Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University,
Chengdu, Sichuan, 610041, P. R. China
| | - Ping Yin
- Key Laboratory of Drug-Targeting
and Drug-Delivery Systems of the Ministry of Education, Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University,
Chengdu, Sichuan, 610041, P. R. China
| | - Yue Chen
- Department of Nuclear Medicine,
Affiliated Hospital, Luzhou Medical College, No. 25 Taiping Street,
Luzhou, Sichuan, 646000, P. R. China
| | - Ling He
- Key Laboratory of Drug-Targeting
and Drug-Delivery Systems of the Ministry of Education, Department
of Medicinal Chemistry, West China School of Pharmacy, Sichuan University,
Chengdu, Sichuan, 610041, P. R. China
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35
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Xie J, Jiang H, Cheng Y, Zhu C. Metal-free, organocatalytic cascade formation of C–N and C–O bonds through dual sp3C–H activation: oxidative synthesis of oxazole derivatives. Chem Commun (Camb) 2012; 48:979-81. [DOI: 10.1039/c2cc15813b] [Citation(s) in RCA: 188] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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36
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Xue WJ, Li Q, Zhu YP, Wang JG, Wu AX. Convergent integration of two self-labor domino sequences: a novel method for the synthesis of oxazole derivatives from methyl ketones and benzoins. Chem Commun (Camb) 2012; 48:3485-7. [DOI: 10.1039/c2cc18077d] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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38
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Wei S, Yu H, Chen J, Deng H, Zhang H, Cao W. Facile Synthesis of 5-Trifluoromethyl-2,4-disubstituted Oxazoles via a Copper(II)-Catalyzed and TBHP/I2-Mediated Tandem Oxidative Cyclization. CHINESE J CHEM 2011. [DOI: 10.1002/cjoc.201100281] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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39
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40
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Synthesis of 2,4- and 2,5-Disubstituted Oxazoles via Metal- Catalyzed Cross-Coupling Reactions. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000668] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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41
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Cano I, Álvarez E, Nicasio MC, Pérez PJ. Regioselective Formation of 2,5-Disubstituted Oxazoles Via Copper(I)-Catalyzed Cycloaddition of Acyl Azides and 1-Alkynes. J Am Chem Soc 2010; 133:191-3. [DOI: 10.1021/ja109732s] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Israel Cano
- Laboratorio de Catálisis Homogénea, Departamento de Química y Ciencias de los Materiales, Unidad Asociada al CSIC, Centro de Investigación en Química Sostenible (CIQSO), Campus de El Carmen s/n, Universidad de Huelva, 21007-Huelva, Spain, Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla, Avenida de Americo Vespucio 49, 41092-Sevilla, Spain and Departamento de Química Inorgánica, Universidad de Sevilla, Aptdo 1203, 41071-Sevilla, Spain
| | - Eleuterio Álvarez
- Laboratorio de Catálisis Homogénea, Departamento de Química y Ciencias de los Materiales, Unidad Asociada al CSIC, Centro de Investigación en Química Sostenible (CIQSO), Campus de El Carmen s/n, Universidad de Huelva, 21007-Huelva, Spain, Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla, Avenida de Americo Vespucio 49, 41092-Sevilla, Spain and Departamento de Química Inorgánica, Universidad de Sevilla, Aptdo 1203, 41071-Sevilla, Spain
| | - M. Carmen Nicasio
- Laboratorio de Catálisis Homogénea, Departamento de Química y Ciencias de los Materiales, Unidad Asociada al CSIC, Centro de Investigación en Química Sostenible (CIQSO), Campus de El Carmen s/n, Universidad de Huelva, 21007-Huelva, Spain, Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla, Avenida de Americo Vespucio 49, 41092-Sevilla, Spain and Departamento de Química Inorgánica, Universidad de Sevilla, Aptdo 1203, 41071-Sevilla, Spain
| | - Pedro J. Pérez
- Laboratorio de Catálisis Homogénea, Departamento de Química y Ciencias de los Materiales, Unidad Asociada al CSIC, Centro de Investigación en Química Sostenible (CIQSO), Campus de El Carmen s/n, Universidad de Huelva, 21007-Huelva, Spain, Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla, Avenida de Americo Vespucio 49, 41092-Sevilla, Spain and Departamento de Química Inorgánica, Universidad de Sevilla, Aptdo 1203, 41071-Sevilla, Spain
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42
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Jiang H, Huang H, Cao H, Qi C. TBHP/I2-Mediated Domino Oxidative Cyclization for One-Pot Synthesis of Polysubstituted Oxazoles. Org Lett 2010; 12:5561-3. [DOI: 10.1021/ol1023085] [Citation(s) in RCA: 162] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Huanfeng Jiang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Huawen Huang
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Hua Cao
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Chaorong Qi
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
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Roy D, Mom S, Beaupérin M, Doucet H, Hierso JC. A Versatile Palladium/Triphosphane System for Direct Arylation of Heteroarenes with Chloroarenes at Low Catalyst Loading. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201002987] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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44
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Roy D, Mom S, Beaupérin M, Doucet H, Hierso JC. A Versatile Palladium/Triphosphane System for Direct Arylation of Heteroarenes with Chloroarenes at Low Catalyst Loading. Angew Chem Int Ed Engl 2010; 49:6650-4. [DOI: 10.1002/anie.201002987] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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45
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Misra NC, Ila H. 4-Bis(methylthio)methylene-2-phenyloxazol-5-one: Versatile Template for Synthesis of 2-Phenyl-4,5-functionalized Oxazoles. J Org Chem 2010; 75:5195-202. [DOI: 10.1021/jo100941f] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nimesh C. Misra
- Department of Chemistry, Indian Institute of Technology, Kanpur-208 016, India
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560 064, India
| | - H. Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560 064, India
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46
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Murai K, Takahara Y, Matsushita T, Komatsu H, Fujioka H. Facile Preparation of Oxazole-4-carboxylates and 4-Ketones from Aldehydes using 3-Oxazoline-4-carboxylates as Intermediates. Org Lett 2010; 12:3456-9. [DOI: 10.1021/ol1012789] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kenichi Murai
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Yusuke Takahara
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Tomoyo Matsushita
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Hideyuki Komatsu
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Hiromichi Fujioka
- Graduate School of Pharmaceutical Sciences, Osaka University, 1-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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47
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Wan C, Zhang J, Wang S, Fan J, Wang Z. Facile Synthesis of Polysubstituted Oxazoles via A Copper-Catalyzed Tandem Oxidative Cyclization. Org Lett 2010; 12:2338-41. [DOI: 10.1021/ol100688c] [Citation(s) in RCA: 140] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Changfeng Wan
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, P. R. China
| | - Jintang Zhang
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, P. R. China
| | - Sujing Wang
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, P. R. China
| | - Jinmin Fan
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, P. R. China
| | - Zhiyong Wang
- Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Soft Matter Chemistry and Department of Chemistry, University of Science and Technology of China, Hefei, 230026, P. R. China
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48
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Bi HP, Teng Q, Guan M, Chen WW, Liang YM, Yao X, Li CJ. Aldehyde- and ketone-induced tandem decarboxylation-coupling (Csp(3)-Csp) of natural alpha-amino acids and alkynes. J Org Chem 2010; 75:783-8. [PMID: 20055374 DOI: 10.1021/jo902319h] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An interesting aldehyde- and ketone-induced intermolecular tandem decarboxylation-coupling (Csp(3)-Csp) catalyzed by copper with use of natural alpha-amino acids as starting materials is developed under neutral conditions with the production of CO(2) and H(2)O as the only byproducts. Various functionalized nitrogen-containing compounds were obtained by this method. In these processes, interesting regioselectivites of the alkylation were observed, which has been rationalized by the relative stability of proposed resonance structures based on computation methods.
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Affiliation(s)
- Hai-Peng Bi
- Department of Chemistry, McGill University, 801 Sherbrooke St. West, Montreal, Quebec H3A 2K6, Canada
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49
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Strotman NA, Chobanian HR, He J, Guo Y, Dormer PG, Jones CM, Steves JE. Catalyst-Controlled Regioselective Suzuki Couplings at Both Positions of Dihaloimidazoles, Dihalooxazoles, and Dihalothiazoles. J Org Chem 2010; 75:1733-9. [DOI: 10.1021/jo100148x] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Jiafang He
- Department of Basic Research (Medicinal Chemistry)
| | - Yan Guo
- Department of Basic Research (Medicinal Chemistry)
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50
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Molander GA, Febo-Ayala W, Jean-Gérard L. Condensation reactions to form oxazoline-substituted potassium organotrifluoroborates. Org Lett 2009; 11:3830-3. [PMID: 19708697 DOI: 10.1021/ol901395c] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A library of oxazoline-substituted potassium organotrifluoroborates was prepared via the condensation of various potassium formyl-substituted aryl- and heteroaryltrifluoroborates with tosylmethyl isocyanide under basic conditions. The efficient Suzuki-Miyaura cross-coupling of products thus formed to various aryl bromides was achieved in good yields. The method allows the facile preparation of oxazole-containing triaromatic products in two steps from simple potassium formyl-substituted aryl- or heteroaryltrifluoroborates.
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Affiliation(s)
- Gary A Molander
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.
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