1
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Ene reactions of pre-aromatic heterocycles – Oxazoles. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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2
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Janicki I, Kiełbasiński P. Still–Gennari Olefination and its Applications in Organic Synthesis. Adv Synth Catal 2020. [DOI: 10.1002/adsc.201901591] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Ignacy Janicki
- Division of Organic ChemistryCentre of Molecular and Macromolecular Studies, Polish Academy of Sciences Sienkiewicza 112 90-363 Łódź Poland
| | - Piotr Kiełbasiński
- Division of Organic ChemistryCentre of Molecular and Macromolecular Studies, Polish Academy of Sciences Sienkiewicza 112 90-363 Łódź Poland
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3
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Kumar Manda SL, Tripathi S, Ghoshal A, Ambule MD, Srivastava AK, Panda G. A Comparative Synthetic Strategy Perspective on α-Amino Acid- and Non-Amino Acid-Derived Synthons towards Total Syntheses of Selected Natural Macrolides. Chemistry 2020; 26:5131-5156. [PMID: 31846112 DOI: 10.1002/chem.201904564] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2019] [Revised: 11/19/2019] [Indexed: 12/29/2022]
Abstract
Macrocyclic alkaloids (macrolides) and cyclopeptides have an immense range of applications in drug discovery research because of their natural abundance and potential biological and physicochemical properties. Presently, more than 100 approved drugs or clinical drug candidates contain macrocyclic scaffolds as the biologically active component. This review provides an interesting perspective about the use of amino acid-derived chiral pools versus other methods derived from miscellaneous synthons towards the total synthesis of non-peptidic macrolides. The synthetic routes and the key strategies involved in the total syntheses of ten natural macrolides have been discussed. Both the amino acid-derived and non-amino acid-derived synthetic routes have been illustrated to present a comparative study between the two approaches.
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Affiliation(s)
- Srinivas Lavanya Kumar Manda
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110025, India
| | - Shashank Tripathi
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110025, India
| | - Anirban Ghoshal
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110025, India
| | - Mayur D Ambule
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110025, India
| | - Ajay Kumar Srivastava
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110025, India
| | - Gautam Panda
- Division of Medicinal and Process Chemistry, CSIR-Central Drug Research Institute, Sector-10, Jankipuram Extension, Lucknow, 226031, India.,Chemical Sciences Division, Academy of Scientific and Innovative Research (AcSIR), New Delhi, 110025, India
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4
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Wang DY, Li HJ, Huang DM, Wu YC. Tin(ii)-catalyzed dehydrative cross-coupling of 2H-chromene hemiacetals with ketones. Org Biomol Chem 2020; 18:9308-9315. [DOI: 10.1039/d0ob01980a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Without the derivatization of 2H-chromene hemiacetals to 2H-chromene acetals, the direct C–OH/C–H coupling reaction has been accomplished with water as the only by-product.
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Affiliation(s)
- Dan-Yang Wang
- School of Marine Science and Technology
- Weihai Marine Organism & Medical Technology Research Institute
- Harbin Institute of Technology
- Weihai 264209
- P. R. China
| | - Hui-Jing Li
- School of Marine Science and Technology
- Weihai Marine Organism & Medical Technology Research Institute
- Harbin Institute of Technology
- Weihai 264209
- P. R. China
| | - Deng-Ming Huang
- School of Marine Science and Technology
- Weihai Marine Organism & Medical Technology Research Institute
- Harbin Institute of Technology
- Weihai 264209
- P. R. China
| | - Yan-Chao Wu
- School of Marine Science and Technology
- Weihai Marine Organism & Medical Technology Research Institute
- Harbin Institute of Technology
- Weihai 264209
- P. R. China
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5
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Xu K, Yang R, Yang S, Jiang C, Ding Z. Hypervalent iodane mediated reactions of N-acetyl enamines for the synthesis of oxazoles and imidazoles. Org Biomol Chem 2019; 17:8977-8981. [PMID: 31576884 DOI: 10.1039/c9ob01895f] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A hypervalent iodane reagent used for the intramolecular cyclization of N-acetyl enamines and intermolecular cyclocondensation of enamines and nitriles was investigated. The reaction was performed under mild conditions and gave oxazoles and imidazoles, respectively, in moderate to excellent yields. This transformation exhibits good reactivity, selectivity and functional group tolerance. The selectivity of the intra- or intermolecular reaction is dependent on the structure of N-acetyl enamines.
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Affiliation(s)
- Kang Xu
- Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 211198, China.
| | - Ruiqi Yang
- Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 211198, China.
| | - Shuang Yang
- Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 211198, China.
| | - Cheng Jiang
- Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 211198, China.
| | - Zhenhua Ding
- Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, Nanjing 211198, China.
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6
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Xiao F, Yuan S, Huang H, Zhang F, Deng GJ. Copper-Catalyzed Three-Component Domino Cyclization for the Synthesis of 4-Aryl-5-(arythio)-2-(trifluoromethyl)oxazoles. Org Lett 2019; 21:8533-8536. [PMID: 31603338 DOI: 10.1021/acs.orglett.9b02934] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A copper-catalyzed oxidative cyclization of oxime, arylthiol, and trifluoroacetic anhydride for the construction of trisubstituted oxazoles has been developed. This transformation combines N-O bond cleavage, C-H functionalization, and intramolecular annulation, providing a practical protocol for the introduction of a trifluoromethyl (-CF3) group at oxazole rings.
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Affiliation(s)
- Fuhong Xiao
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry , Key Laboratory for Green Organic Synthesis and Application of Hunan Province Xiangtan University , Xiangtan 411105 , China
| | - Shanshan Yuan
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry , Key Laboratory for Green Organic Synthesis and Application of Hunan Province Xiangtan University , Xiangtan 411105 , China
| | - Huawen Huang
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry , Key Laboratory for Green Organic Synthesis and Application of Hunan Province Xiangtan University , Xiangtan 411105 , China
| | - Feng Zhang
- College of Science , Hunan Agricultural University , Changsha 410128 , China
| | - Guo-Jun Deng
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education, College of Chemistry , Key Laboratory for Green Organic Synthesis and Application of Hunan Province Xiangtan University , Xiangtan 411105 , China
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7
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Fragment splicing-based design, synthesis and safener activity of novel substituted phenyl oxazole derivatives. Bioorg Med Chem Lett 2018; 29:570-576. [PMID: 30606701 DOI: 10.1016/j.bmcl.2018.12.061] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 12/28/2018] [Accepted: 12/28/2018] [Indexed: 11/22/2022]
Abstract
Fragment splicing is a primary strategy in the design and optimization of leading compound toward new skeleton with target bioactivity. Herein a series of novel substituted phenyl oxazole derivatives were designed via fragment analysis and coupling strategy that led to highly potent and bio-selective herbicide safener. The biological tests showed that most of the compounds could enhance the maize growth index, glutathione content and anti-reverse enzyme glutathione S-transferase activity in vivo. The molecular docking model exhibited that the novel compound could compete with chlorsulfuron binding to the herbicide target enzyme, which consequently attained the herbicide detoxification. Especially compound I-f displayed the best activities than commercial safener isoxadifen-ethyl and other compounds. The present work demonstrates that the synthesized compounds could be developed as potential candidates for the discovery of novel herbicide safeners in the future.
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8
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Abstract
The synthesis of the macrocyclic core of the cytotoxic natural product salarin C from the sponge Fascaplysinopsis sp. is described, with the two epoxides being replaced by alkene moieties. In the key step, ring-closing metathesis exclusively afforded the ( E)-product. NOESY-based conformational analysis of the macrolactone showed that the oxazole ring and its unsaturated side chains are located in a common plane. Mimicking the conversion of salarin C to salarin A, the trisubstituted oxazole unit embedded in the 17-membered ring underwent photooxidation on treatment with singlet oxygen, affording macrocyclic trisacylamines.
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Affiliation(s)
- Jan-Niklas Schäckermann
- TU Braunschweig , Institute of Organic Chemistry , Hagenring 30 , 38106 Braunschweig , Germany
| | - Thomas Lindel
- TU Braunschweig , Institute of Organic Chemistry , Hagenring 30 , 38106 Braunschweig , Germany
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9
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Huang DM, Li HJ, Wang Q, Yan P, Wu YC. Synthesis of 2-(2H
-Chromenyl)-Oxazoles from 2H
-Chromene Hemiacetals by Using a Modified Passerini-Type Reaction. ChemistrySelect 2018. [DOI: 10.1002/slct.201802363] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Deng-Ming Huang
- School of Marine Science and Technology; Harbin Institute of Technology, No. 2; Wenhuaxi Road Weihai 264209, P. R. China
| | - Hui-Jing Li
- School of Marine Science and Technology; Harbin Institute of Technology, No. 2; Wenhuaxi Road Weihai 264209, P. R. China
| | - Quanfu Wang
- School of Marine Science and Technology; Harbin Institute of Technology, No. 2; Wenhuaxi Road Weihai 264209, P. R. China
| | - Peisheng Yan
- School of Marine Science and Technology; Harbin Institute of Technology, No. 2; Wenhuaxi Road Weihai 264209, P. R. China
| | - Yan-Chao Wu
- School of Marine Science and Technology; Harbin Institute of Technology, No. 2; Wenhuaxi Road Weihai 264209, P. R. China
- Beijing National Laboratory for Molecular Sciences (BNLMS); Institute of Chemistry Chinese Academy of Sciences, No.2, 1st North Street, Zhongguancun; Beijing 100190, P. R. China
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10
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Pogaku N, Krishna PR, Prapurna YL. Iodine-mediated new strategy for the synthesis of 2,5-disubstituted oxazoles from methyl ketones and TosMIC. SYNTHETIC COMMUN 2018. [DOI: 10.1080/00397911.2018.1477962] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Naresh Pogaku
- Discovery Laboratory Organic and Biomolecular Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi, India
| | - Palakodety Radha Krishna
- Discovery Laboratory Organic and Biomolecular Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad, India
| | - Y. Lakshmi Prapurna
- Discovery Laboratory Organic and Biomolecular Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad, India
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11
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Velikorodov AV, Shustova EA, Nosachev SB. Synthesis of 2,5-diaryl-1,3-oxazoles containing a carbamate group. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2018. [DOI: 10.1134/s1070428017120120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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12
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Li D, Yang D, Wang L, Liu X, Wang K, Wang J, Wang P, Liu Y, Zhu H, Wang R. An Efficient Nickel-Catalyzed Asymmetric Oxazole-Forming Ugi-Type Reaction for the Synthesis of Chiral Aryl-Substituted THIQ Rings. Chemistry 2017; 23:6974-6978. [PMID: 28470882 DOI: 10.1002/chem.201700970] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Indexed: 01/01/2023]
Abstract
A nickel-catalyzed asymmetric oxazole-forming Ugi reaction of C,N-cyclic azomethine imines and isonitriles is disclosed. The reported protocol proceeds smoothly, and gives the corresponding adducts, which contain two important pharmaceutically active ring-systems (tetrahydroquinoline and oxazole rings), in good yields and excellent enantioselectivities by employing an easily accessible chiral diamine as a ligand. This simple and efficient strategy provides easy access to a series of C1-substituted aryl tetrahydroisoquinolines.
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Affiliation(s)
- Dan Li
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Dongxu Yang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Linqing Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Xihong Liu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Kezhou Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Jie Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Pengxin Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Yuyang Liu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Haiyong Zhu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000, P. R. China
| | - Rui Wang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, Lanzhou University, Lanzhou, 730000, P. R. China.,State Key Laboratory of Chiroscience, Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Kowloon, P. R. China
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13
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Schäckermann JN, Lindel T. Synthesis and Photooxidation of the Trisubstituted Oxazole Fragment of the Marine Natural Product Salarin C. Org Lett 2017; 19:2306-2309. [PMID: 28425712 DOI: 10.1021/acs.orglett.7b00845] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The eastern section of the macrocyclic marine natural product salarin C from the sponge Fascaplysinopsis sp. was synthesized employing a halogen dance reaction to assemble the trisubstituted oxazole moiety. The synthesis was inspired by Kashman's hypothesis on the biomimetic oxidation of salarin C to salarin A. Clean conversion to the triacylamine partial structure of salarin A occurred on treatment with photochemically generated singlet oxygen. Thus, a Wasserman-type oxidative rearrangement is chemically possible in this case.
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Affiliation(s)
| | - Thomas Lindel
- TU Braunschweig, Institute of Organic Chemistry , Hagenring 30, 38106 Braunschweig, Germany
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14
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15
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Synthesis of the phorboxazoles—potent, architecturally novel marine natural products. J Antibiot (Tokyo) 2016; 69:220-52. [DOI: 10.1038/ja.2016.8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 01/14/2016] [Accepted: 01/19/2016] [Indexed: 11/08/2022]
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16
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Ibrar A, Khan I, Abbas N, Farooq U, Khan A. Transition-metal-free synthesis of oxazoles: valuable structural fragments in drug discovery. RSC Adv 2016. [DOI: 10.1039/c6ra19324b] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
This review article encapsulates the recent developments in the metal-free approaches used to construct oxazole moiety.
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Affiliation(s)
- Aliya Ibrar
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad-22060
- Pakistan
| | - Imtiaz Khan
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad-45320
- Pakistan
| | - Naeem Abbas
- Department of Chemistry
- Quaid-i-Azam University
- Islamabad-45320
- Pakistan
| | - Umar Farooq
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad-22060
- Pakistan
| | - Ajmal Khan
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad-22060
- Pakistan
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17
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Seetharamsingh B, Khairnar PV, Reddy DS. First Total Synthesis of Gliomasolide C and Formal Total Synthesis of Sch-725674. J Org Chem 2015; 81:290-6. [DOI: 10.1021/acs.joc.5b02318] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- B. Seetharamsingh
- CSIR-National Chemical Laboratory, Division
of Organic Chemistry, Dr. HomiBhabha Road, Pune, 411008, India
| | - Pankaj V. Khairnar
- CSIR-National Chemical Laboratory, Division
of Organic Chemistry, Dr. HomiBhabha Road, Pune, 411008, India
| | - D. Srinivasa Reddy
- CSIR-National Chemical Laboratory, Division
of Organic Chemistry, Dr. HomiBhabha Road, Pune, 411008, India
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18
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Bai Y, Chen W, Chen Y, Huang H, Xiao F, Deng GJ. Copper-catalyzed oxidative cyclization of arylamides and β-diketones: new synthesis of 2,4,5-trisubstituted oxazoles. RSC Adv 2015. [DOI: 10.1039/c4ra14394a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Various 2,4,5-trisubstituted oxazoles were prepared from benzamides and β-diketones using CuBr as the sole catalyst.
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Affiliation(s)
- Yang Bai
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
- China
| | - Wen Chen
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
- China
| | - Ya Chen
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
- China
| | - Huawen Huang
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
- China
| | - Fuhong Xiao
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
- China
| | - Guo-Jun Deng
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
- China
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19
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Bali AK, Sunnam SK, Prasad KR. Enantiospecific Total Synthesis of Macrolactone Sch 725674. Org Lett 2014; 16:4001-3. [DOI: 10.1021/ol5018678] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Amit K. Bali
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India
| | - Sunil K. Sunnam
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India
| | - Kavirayani R. Prasad
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560 012, India
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20
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Best D, Lam HW. C═N-Containing Azaarenes as Activating Groups in Enantioselective Catalysis. J Org Chem 2013; 79:831-45. [DOI: 10.1021/jo402414k] [Citation(s) in RCA: 112] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Daniel Best
- EaStCHEM, School of Chemistry, University of Edinburgh, Joseph Black Building, The King’s Buildings,
West Mains Road, Edinburgh EH9 3JJ, United Kingdom
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Hon Wai Lam
- EaStCHEM, School of Chemistry, University of Edinburgh, Joseph Black Building, The King’s Buildings,
West Mains Road, Edinburgh EH9 3JJ, United Kingdom
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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21
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Herndon JW. The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2011. Coord Chem Rev 2013. [DOI: 10.1016/j.ccr.2013.05.011] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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22
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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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23
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24
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Clarke PA, Ermanis K. Synthesis of the C20–C32 Tetrahydropyran Core of the Phorboxazoles and the C22 Epimer via a Stereodivergent Michael Reaction. Org Lett 2012; 14:5550-3. [DOI: 10.1021/ol3026523] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paul A. Clarke
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
| | - Kristaps Ermanis
- Department of Chemistry, University of York, Heslington, York YO10 5DD, United Kingdom
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25
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Kuntiyong P, Lee TH, Kranemann CL, White JD. Total synthesis of the marine toxin phorboxazole A using palladium(II)-mediated intramolecular alkoxycarbonylation for tetrahydropyran synthesis. Org Biomol Chem 2012; 10:7884-99. [PMID: 22910851 DOI: 10.1039/c2ob25766a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The potent antitumor agent phorboxazole A was synthesized from six subunits comprising C1-C2 (115), C3-C8 (98), C9-C19 (74), C20-C32 (52), C33-C41 (84) and C42-C46 (85). Tetrahydropyrans B and C containing cis-2,6-disubstitution were fabricated via palladium(II)-mediated intramolecular alkoxycarbonylation which, in the case of tetrahydropyran C, was carried out with catalytic palladium(II) and p-benzoquinone as the stoichiometric re-oxidant. Tetrahydropyran D was obtained by a stereoselective tin(IV)-catalyzed coupling of a C9 aldehyde with an allylsilane, and the C19-C20 connection was made using a completely stereoselective Wittig-Schlosser (E) olefination. Coupling of the oxazole C32 methyl substituent with the intact C33-C46 δ-lactone 3was accompanied by elimination of the vinyl bromide to a terminal alkyne, but the C32-C33 linkage was implemented successfully with 83 and C33-C41 lactone 84. The C42-C46 segment of the side chain was then appended via Julia-Kocienski olefination. The macrolide portion of phorboxazole A was completed by means of an Ando-Still-Gennari intramolecular (Z)-selective olefination at C2-C3 which required placement of a (dimethoxyphosphinyl)acetate moiety at C24. Final deprotection led to phorboxazole A via a route in which the longest linear sequence is 37 steps and the overall yield is 0.36%.
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Affiliation(s)
- Punlop Kuntiyong
- Department of Chemistry, Oregon State University, Corvallis, Oregon, USA
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Cheung CW, Buchwald SL. Room temperature copper(II)-catalyzed oxidative cyclization of enamides to 2,5-disubstituted oxazoles via vinylic C-H functionalization. J Org Chem 2012; 77:7526-37. [PMID: 22838632 PMCID: PMC3454444 DOI: 10.1021/jo301332s] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A copper(II)-catalyzed oxidative cyclization of enamides to oxazoles via vinylic C-H bond functionalization at room temperature is described. Various 2,5-disubstituted oxazoles bearing aryl, vinyl, alkyl, and heteroaryl substituents could be synthesized in moderate to high yields. This reaction protocol is complementary to our previously reported iodine-mediated cyclization of enamides to afford 2,4,5-trisubstituted oxazoles.
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Affiliation(s)
- Chi Wai Cheung
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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Spencer J, Patel H, Amin J, Callear SK, Coles SJ, Deadman JJ, Furman C, Mansouri R, Chavatte P, Millet R. Microwave-mediated synthesis and manipulation of a 2-substituted-5-aminooxazole-4-carbonitrile library. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.01.081] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Saad ZB, Chong SX, Wong ZX, Abdallah HH, Al-Saadi AA. Structural properties and vibrational spectra of 2-formyloxazole and its 2-thioformyl and 2-selenoformyl derivatives. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2011.10.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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