1
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Sekar P, Gupta A, English LE, Rabbitt CE, Male L, Jupp AR, Davies PW. Regiodivergent Synthesis of 4- and 5-Sulfenyl Oxazoles from Alkynyl Thioethers. Chemistry 2024:e202401465. [PMID: 38743746 DOI: 10.1002/chem.202401465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2024] [Revised: 05/11/2024] [Accepted: 05/13/2024] [Indexed: 05/16/2024]
Abstract
The regiodivergent synthesis of 4- and 5-sulfenyl oxazoles from 1,4,2-dioxazoles and alkynyl thioethers has been achieved. Gold-catalysed conditions are used to favour the formation of 5-sulfenyl oxazoles via β-selective attack of the nitrenoid relative to the sulfenyl group. In contrast, 4-sulfenyl oxazoles are formed by α-selective reaction under Brønsted acid conditions from the same substrates. The nature of stabilising gold-sulfur interactions have been investigated by natural bond orbital analysis, showing that the S→Au interactions are significantly stronger in the intermediate that favours the 5-sulfenyl oxazoles. A kinetic survey identifies catalyst inhibition processes. This study into the regiodivergent methods includes the development of telescoped annulation-oxidation protocols for regioselective access to oxazole sulfoxides and sulfones.
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Affiliation(s)
- Prakash Sekar
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Aniket Gupta
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Laura E English
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Clare E Rabbitt
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Louise Male
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Andrew R Jupp
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Paul W Davies
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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2
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Shinde RS, Narnawre AR, Karade NN. Metal-free Intramolecular Oxidative Cyclization of (Z)-2-Benzamido-3-arylacrylates Using I2/DMSO: Synthesis of 2,4,5-Trisubstituted Oxazoles. Tetrahedron Lett 2023. [DOI: 10.1016/j.tetlet.2023.154370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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3
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Prashanth S, Adarsh D, Bantu R, Sridhar B, Subba Reddy B. Cu(II)-catalyzed synthesis of 2,4,5-trisubstituted oxazoles. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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4
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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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5
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Oberheide A, Gaigne F, Arndt H. Divergent Synthesis of C5‐Heteroatom Substituted Oxazoles. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ansgar Oberheide
- Friedrich-Schiller-Universität Jena Institut für Organische Chemie und Makromolekulare Chemie Humboldtstr. 10 D-07743 Jena Germany
| | - Frédéric Gaigne
- Friedrich-Schiller-Universität Jena Institut für Organische Chemie und Makromolekulare Chemie Humboldtstr. 10 D-07743 Jena Germany
| | - Hans‐Dieter Arndt
- Friedrich-Schiller-Universität Jena Institut für Organische Chemie und Makromolekulare Chemie Humboldtstr. 10 D-07743 Jena Germany
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6
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Kumar SV, Acharya A, Ila H. Synthesis of 2,4,5-Trisubstituted Oxazoles with Complementary Regioselectivity from α-Oxoketene Dithioacetals and β-(Methylthio)-β-(het)aryl-2-propenones. J Org Chem 2018; 83:6607-6622. [DOI: 10.1021/acs.joc.8b00900] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Siripuram Vijay Kumar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research(JNCASR), Jakkur, Bangalore 560064, India
| | - Anand Acharya
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research(JNCASR), Jakkur, Bangalore 560064, India
| | - Hiriyakkanavar Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research(JNCASR), Jakkur, Bangalore 560064, India
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7
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Weng Y, Lv W, Yu J, Ge B, Cheng G. Preparation of 2,4,5-Trisubstituted Oxazoles through Iodine-mediated Aerobic Oxidative Cyclization of Enaminones. Org Lett 2018; 20:1853-1856. [DOI: 10.1021/acs.orglett.8b00376] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Yunxiang Weng
- College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, China
| | - Weiwei Lv
- College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, China
| | - Jia Yu
- College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, China
| | - Bailu Ge
- College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, China
| | - Guolin Cheng
- College of Materials Science & Engineering, Huaqiao University, Xiamen 361021, China
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8
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Reactions of 5-mesyl-2-phenyl-4-tosyloxazole with N-, C-, and S-nucleophiles. Chem Heterocycl Compd (N Y) 2018. [DOI: 10.1007/s10593-018-2237-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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9
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Li P, Zhao J, Li X, Li F. Alkali-Induced Ring-Opening of 2-Amidodihydrofuran and Manganese-Catalyzed Aerobic Dehydrogenation Annulation: Access to Functionalized Oxazole. J Org Chem 2017; 82:4569-4577. [DOI: 10.1021/acs.joc.7b00112] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pan Li
- State Key Laboratory for
Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical
Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China
| | - Jingjing Zhao
- State Key Laboratory for
Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical
Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China
| | - Xinjian Li
- State Key Laboratory for
Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical
Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China
| | - Fuwei Li
- State Key Laboratory for
Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical
Physics, Chinese Academy of Sciences, Lanzhou 730000, P. R. China
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10
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Zhang W, Yu W, Yan Q, Liu Z, Zhang Y. Synthesis of substituted oxazoles via Pd-catalyzed tandem oxidative cyclization. Org Chem Front 2017. [DOI: 10.1039/c7qo00517b] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
An easy approach to access multisubstituted oxazoles via tandem oxidative cyclization is developed.
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Affiliation(s)
- Wei Zhang
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
| | - Wenlong Yu
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
| | - Qiangqiang Yan
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
| | - Zhanxiang Liu
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
| | - Yuhong Zhang
- Department of Chemistry
- Zhejiang University
- Hangzhou 310027
- China
- State Key Laboratory of Applied Organic Chemistry
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11
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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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12
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Querard P, Girard SA, Uhlig N, Li CJ. Gold-catalyzed tandem reactions of amide-aldehyde-alkyne coupling and cyclization-synthesis of 2,4,5-trisubstituted oxazoles. Chem Sci 2015; 6:7332-7335. [PMID: 29861964 PMCID: PMC5950834 DOI: 10.1039/c5sc02933c] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Accepted: 10/05/2015] [Indexed: 12/13/2022] Open
Abstract
We report the first cationic gold(i)-catalyzed one-pot reaction of amide, alkyne and aldehyde followed by cyclization, to successfully access highly substituted oxazoles derivatives in good yields. A single catalyst allows the occurring of this multi-step reaction atom- and step-economically, with water as the only theoretical side product.
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Affiliation(s)
- Pierre Querard
- Department of Chemistry , FQRNT Center for Green Chemistry and Catalysis , McGill University , 801 Sherbrooke Street West , Montreal , Quebec H3A 0B8 , Canada .
| | - Simon A Girard
- Department of Chemistry , FQRNT Center for Green Chemistry and Catalysis , McGill University , 801 Sherbrooke Street West , Montreal , Quebec H3A 0B8 , Canada .
| | - Nick Uhlig
- Department of Chemistry , FQRNT Center for Green Chemistry and Catalysis , McGill University , 801 Sherbrooke Street West , Montreal , Quebec H3A 0B8 , Canada .
| | - Chao-Jun Li
- Department of Chemistry , FQRNT Center for Green Chemistry and Catalysis , McGill University , 801 Sherbrooke Street West , Montreal , Quebec H3A 0B8 , Canada .
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13
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Samanta S, Donthiri RR, Dinda M, Adimurthy S. Iodine catalysed intramolecular C(sp3)–H functionalization: synthesis of 2,5-disubstituted oxazoles from N-arylethylamides. RSC Adv 2015. [DOI: 10.1039/c5ra13441b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Iodine catalyzed synthesis of 2,5-substituted oxazoles from N-arylethylamides through intramolecular C(sp3)–H functionalization under metal-free conditions is described.
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Affiliation(s)
- Supravat Samanta
- Academy of Scientific & Innovative Research
- Process Development & Engineering Cell
- CSIR–Central Salt & Marine Chemicals Research Institute
- Bhavnagar-364 002
- India
| | - Ramachandra Reddy Donthiri
- Academy of Scientific & Innovative Research
- Process Development & Engineering Cell
- CSIR–Central Salt & Marine Chemicals Research Institute
- Bhavnagar-364 002
- India
| | - Milan Dinda
- Academy of Scientific & Innovative Research
- Process Development & Engineering Cell
- CSIR–Central Salt & Marine Chemicals Research Institute
- Bhavnagar-364 002
- India
| | - Subbarayappa Adimurthy
- Academy of Scientific & Innovative Research
- Process Development & Engineering Cell
- CSIR–Central Salt & Marine Chemicals Research Institute
- Bhavnagar-364 002
- India
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14
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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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15
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Koley S, Chowdhury S, Chanda T, Ramulu BJ, Anand N, Singh MS. Ligand- and Base-Free CuII-Mediated SelectiveS-Arylation of α-Enolic Dithioesters by Chan-Lam Coupling at Room Temperature. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403171] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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16
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Zheng M, Huang L, Huang H, Li X, Wu W, Jiang H. Palladium-catalyzed sequential C-N/C-O bond formations: synthesis of oxazole derivatives from amides and ketones. Org Lett 2014; 16:5906-9. [PMID: 25393588 DOI: 10.1021/ol502916a] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
A highly efficient method for the synthesis of oxazole derivatives from simple amides and ketones has been established via a Pd(II)-catalyzed sp(2) C-H activation pathway in one step. The reaction is supposed to proceed through a C-N bond formation followed by a C-O bond formation closing the ring. Because of the simple and readily available starting materials, easy operation, and high bioactivity of oxazoles, this strategy can be broadly applied to medical chemistry.
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Affiliation(s)
- Meifang Zheng
- School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou 510640, P. R. China
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17
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Singh TP, Khan R, Noh YR, Lee SG, Singh OM. Indium(III) Chloride Mediated Michael Addition of Indoles to Ketene S,S-Acetals: Synthesis of Bis- and Tris-indolylketones. B KOREAN CHEM SOC 2014. [DOI: 10.5012/bkcs.2014.35.10.2950] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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18
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Vijay Kumar S, Saraiah B, Parameshwarappa G, Ila H, Verma GK. Synthesis of N-Functionalized/NH-Multisubstituted Indoles, Thienopyrroles, Pyrroloindoles, and Pyrazolopyrroles via Sequential One-Pot Base-Mediated and Copper-Catalyzed Inter- and Intramolecular Amination of 2-[2-Bromo(het)aryl]-3-(het)aryl-3-(methylthio)acrylonitriles. J Org Chem 2014; 79:7961-78. [DOI: 10.1021/jo501114a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- S. Vijay Kumar
- New
Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
| | - B. Saraiah
- New
Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
| | - G. Parameshwarappa
- New
Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
| | - H. Ila
- New
Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India
| | - Girijesh K. Verma
- Department
of Chemistry, Banaras Hindu University, Varanasi 221005, India
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19
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Bailey JL, Sudini RR. Synthesis of 2,4- and 2,4,5-substituted oxazoles via a silver triflate mediated cyclization. Tetrahedron Lett 2014. [DOI: 10.1016/j.tetlet.2014.05.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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20
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Talapuru BP, Gopala L, Adivireddy P, Venkatapuram P. Synthesis and antioxidant activity of amidomethane sulfonyl-linked bis heterocycles. Med Chem Res 2014. [DOI: 10.1007/s00044-014-1022-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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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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22
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Raghava B, Parameshwarappa G, Acharya A, Swaroop TR, Rangappa KS, Ila H. Cyclocondensation of Hydroxylamine with 1,3-Bis(het)arylmonothio 1,3-Diketones and 1,3-Bis(het)aryl-3-(methylthio)-2-propenones: Synthesis of 3,5-Bis(het)arylisoxazoles with Complementary Regioselectivity. European J Org Chem 2014. [DOI: 10.1002/ejoc.201301667] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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23
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Abstract
2,5- and 2,4,5-substituted oxazoles were prepared in one-pot by the NBS/Me2S-mediated cyclization of enamides in the presence of base.
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Affiliation(s)
- Niranjan Panda
- Department of Chemistry
- National Institute of Technology
- Rourkela-769008, India
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24
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25
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Dinda M, Samanta S, Eringathodi S, Ghosh PK. Solar photo-thermochemical syntheses of 4-bromo-2,5-substituted oxazoles from N-arylethylamides. RSC Adv 2014. [DOI: 10.1039/c3ra47603k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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26
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Liu B, Zhang Y, Huang G, Zhang X, Niu P, Wu J, Yu W, Chang J. A concise approach to polysubstituted oxazoles from N-acyl-2-bromo enamides via a copper(i)/amino acid-catalyzed intramolecular C–O bond formation. Org Biomol Chem 2014; 12:3912-23. [DOI: 10.1039/c4ob00309h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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27
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Yugandar S, Misra NC, Parameshwarappa G, Panda K, Ila H. Reaction of Cyclic α-Oxoketene Dithioacetals with Methylene Isocyanides: A Novel Pyrrole Annulation–Ring-Expansion Domino Process. Org Lett 2013; 15:5250-3. [DOI: 10.1021/ol402469v] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Somaraju Yugandar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 50064, India, and Department of Chemistry, Indian Institute of Technology, Kanpur 208016, U. P., India
| | - Nimesh C. Misra
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 50064, India, and Department of Chemistry, Indian Institute of Technology, Kanpur 208016, U. P., India
| | - Gangajji Parameshwarappa
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 50064, India, and Department of Chemistry, Indian Institute of Technology, Kanpur 208016, U. P., India
| | - Kausik Panda
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 50064, India, and Department of Chemistry, Indian Institute of Technology, Kanpur 208016, U. P., India
| | - Hiriyakkanavar Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 50064, India, and Department of Chemistry, Indian Institute of Technology, Kanpur 208016, U. P., India
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28
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Chiacchio U, Barbera V, Bonfanti R, Broggini GL, Campisi A, Gazzola S, Parenti R, Romeo G. Synthesis and biological evaluation of 1,7,8,8a-tetrahydro-3H-oxazolo[3,4-a]pyrazin-6(5H)-ones as antitumoral agents. Bioorg Med Chem 2013; 21:5748-53. [PMID: 23916151 DOI: 10.1016/j.bmc.2013.07.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2013] [Revised: 07/08/2013] [Accepted: 07/09/2013] [Indexed: 10/26/2022]
Abstract
A series of 1,7,8,8a-tetrahydro-3H-oxazolo[3,4-a]pyrazin-6(5H)-ones has been synthesized by an intramolecular, palladium(II) catalyzed, aminooxygenation of alkenyl ureas, readily available from glycine allylamides as starting materials. Biological tests showed that the obtained compounds are endowed with an interesting antitumoral activity against two human thyroid cancer cell lines, namely FTC-133 and 8305C, by promoting the apoptotic pathway and DNA fragmentation.
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Affiliation(s)
- Ugo Chiacchio
- Dipartimento di Scienze del Farmaco, Università di Catania, Italy.
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29
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One-pot straightforward approach to 2,3-disubstituted benzo/naphtho[b]furans via domino annulation of α-oxoketene dithioacetals and 1,4-benzo/naphthoquinone mediated by AlCl3 at room temperature. Tetrahedron 2013. [DOI: 10.1016/j.tet.2013.05.128] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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30
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Kumar SV, Parameshwarappa G, Ila H. Synthesis of 2,4,5-Trisubstituted Thiazoles via Lawesson’s Reagent-Mediated Chemoselective Thionation–Cyclization of Functionalized Enamides. J Org Chem 2013; 78:7362-9. [DOI: 10.1021/jo401208u] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- S. Vijay Kumar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560064,
Karnataka, India
| | - G. Parameshwarappa
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560064,
Karnataka, India
| | - H. Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560064,
Karnataka, India
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31
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Abstract
Ketene dithioacetals are versatile intermediates in organic synthesis. Extensive research, since the last decade, has given rise to new prospects in their chemistry. The objective of this review is twofold: first, to highlight the new prospects in the chemistry of functionalized ketene dithioacetals, and second, to provide an intrinsic link between ketene dithioacetal groups and a variety of other functional groups, which has brought out many new facts that will assist in future designs.
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Affiliation(s)
- Ling Pan
- Department of Chemistry, Northeast Normal University, 5268 Renmin Street, Changchun, 130024, China
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33
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Kumar SV, Yadav SK, Raghava B, Saraiah B, Ila H, Rangappa KS, Hazra A. Cyclocondensation of arylhydrazines with 1,3-bis(het)arylmonothio-1,3-diketones and 1,3-bis(het)aryl-3-(methylthio)-2-propenones: synthesis of 1-aryl-3,5-bis(het)arylpyrazoles with complementary regioselectivity. J Org Chem 2013; 78:4960-73. [PMID: 23607788 DOI: 10.1021/jo400599e] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Two efficient highly regioselective routes for the synthesis of unsymmetrically substituted 1-aryl-3,5-bis(het)arylpyrazoles with complementary regioselectivity starting from active methylene ketones have been reported. In the first protocol, the newly synthesized 1,3-bis(het)aryl-monothio-1,3-diketone precursors (prepared by condensation of active methylene ketones with het(aryl) dithioesters in the presence of sodium hydride) were reacted with arylhydrazines in refluxing ethanol under neutral conditions, furnishing 1-aryl-3,5-bis(het)arylpyrazoles 7, in which the het(aryl) moiety attached to the thiocarbonyl group of monothio-1,3-diketones is installed at the 3-position. In the second method, the corresponding 3-(methylthio)-1,3-bis(het)aryl-2-propenones (prepared in situ by base-induced alkylation of 1,3-monothiodiketones) were condensed with arylhydrazines in the presence of potassium tert-butoxide in refluxing tert-butyl alcohol, yielding 1-aryl-3,5-bis(het)arylpyrazoles 9 with complementary regioselectivity (method A). The efficiency of this protocol was further improved by developing a one-pot, three-component procedure for the synthesis of pyrazoles 9, directly from active methylene ketones, by reacting in situ generated 3-(methylthio)-1,3-bis(het)aryl-2-propenones with arylhydrazines in the presence of sodium hydride (instead of potassium tert-butoxide as base). The structures and regiochemistry of newly synthesized pyrazoles were confirmed from their spectral and analytical data along with X-ray crystallographic data of three pairs of regioisomers.
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Affiliation(s)
- S Vijay Kumar
- New Chemistry unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560064, India
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34
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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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35
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Shah SR, Navathe SS, Dikundwar AG, Guru Row TN, Vasella AT. Thermal Rearrangement of Azido Ketones into Oxazoles via Azirines: One-Pot, Metal-Free Heteroannulation to Functionalized 1,3-Oxazoles. European J Org Chem 2012. [DOI: 10.1002/ejoc.201201269] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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36
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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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37
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Zheng Y, Li X, Ren C, Zhang-Negrerie D, Du Y, Zhao K. Synthesis of Oxazoles from Enamides via Phenyliodine Diacetate-Mediated Intramolecular Oxidative Cyclization. J Org Chem 2012; 77:10353-61. [DOI: 10.1021/jo302073e] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Yunhui Zheng
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Xuming Li
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Chengfeng Ren
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Daisy Zhang-Negrerie
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Yunfei Du
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
| | - Kang Zhao
- Tianjin Key Laboratory for Modern Drug Delivery & High-Efficiency, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, China
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38
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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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39
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Verma RK, Verma GK, Shukla G, Singh MS. InCl3 catalyzed domino route to 2H-chromene-2-ones via [4 + 2] annulation of 2-hydroxyarylaldehydes with α-oxoketene dithioacetal under solvent-free conditions. RSC Adv 2012. [DOI: 10.1039/c2ra00987k] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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41
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Jin W, Du W, Yang Q, Yu H, Chen J, Yu Z. Regio- and Stereoselective Synthesis of Multisubstituted Olefins and Conjugate Dienes by Using α-Oxo Ketene Dithioacetals as the Building Blocks. Org Lett 2011; 13:4272-5. [DOI: 10.1021/ol201620g] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Weiwei Jin
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), 457 Zhongshan Road, Dalian, Liaoning 116023, China, and State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, 354 Fenglin Road, Shanghai 200032, China
| | - Wangming Du
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), 457 Zhongshan Road, Dalian, Liaoning 116023, China, and State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, 354 Fenglin Road, Shanghai 200032, China
| | - Qin Yang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), 457 Zhongshan Road, Dalian, Liaoning 116023, China, and State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, 354 Fenglin Road, Shanghai 200032, China
| | - Haifeng Yu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), 457 Zhongshan Road, Dalian, Liaoning 116023, China, and State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, 354 Fenglin Road, Shanghai 200032, China
| | - Jiping Chen
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), 457 Zhongshan Road, Dalian, Liaoning 116023, China, and State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, 354 Fenglin Road, Shanghai 200032, China
| | - Zhengkun Yu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences (CAS), 457 Zhongshan Road, Dalian, Liaoning 116023, China, and State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, CAS, 354 Fenglin Road, Shanghai 200032, China
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Yang Y, Gao M, Wu LM, Deng C, Zhang DX, Gao Y, Zhu YP, Wu AX. A facile synthesis of indole–furan conjugates via integration of convergent and linear domino reactions. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.05.058] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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43
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Singh PP, Yadav AK, Ila H, Junjappa H. A Novel Radical Cyclization Approach to Thieno-Fused Heterocycles. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100516] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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44
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Lechel T, Gerhard M, Trawny D, Brusilowskij B, Schefzig L, Zimmer R, Rabe JP, Lentz D, Schalley CA, Reissig HU. Synthesis of 5-Acetyloxazoles and 1,2-Diketones from β-Alkoxy-β-ketoenamides and Their Subsequent Transformations. Chemistry 2011; 17:7480-91. [DOI: 10.1002/chem.201100382] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Indexed: 11/06/2022]
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45
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Lalli C, Bouma MJ, Bonne D, Masson G, Zhu J. Exploiting the divergent reactivity of α-isocyanoacetate: multicomponent synthesis of 5-alkoxyoxazoles and related heterocycles. Chemistry 2010; 17:880-9. [PMID: 21226103 DOI: 10.1002/chem.201002098] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2010] [Indexed: 11/09/2022]
Abstract
A novel multicomponent synthesis of 5-alkoxyoxazoles, based on a new reactivity profile of α-isocyanoacetates, is described. Thus, simply heating a solution of amine, aldehyde, and α-(EWG-phenyl)-α-isocyanoacetate or α-(4-pyridyl)-α-isocyanoacetate (EWG=electron-withdrawing group) in toluene provided 5-alkoxyoxazoles in good to excellent yields. Reaction of the 5-alkoxyoxazoles with various α,β-unsaturated acyl chlorides led to the formation of epoxytetrahydropyrrolo[3,4-b]pyridin-5-ones by a domino N-acylation/Diels-Alder cycloaddition sequence. Subsequent fragmentation under basic conditions provided 6,7-dihydro-5H-pyrrolo[3,4-b]pyridin-5-ones. A four-component synthesis of the pyridin-5-one compounds, without isolation of the 5-alkoxyoxazole, was subsequently developed.
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Affiliation(s)
- Claudia Lalli
- Centre de Recherche de Gif, Institut de Chimie des Substances Naturelles CNRS, Avenue de la Terrasse, 91198 Gif-sur-Yvette Cedex, France
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