1
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Asymmetric Phase Transfer Catalysed Michael Addition of γ-Butenolide and N-Boc-Pyrrolidone to 4-Nitro-5-styrylisoxazoles. Catalysts 2022. [DOI: 10.3390/catal12060634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/10/2022] Open
Abstract
Herein we report the addition of acidic γ-butenolide and N-Boc-pyrrolidone to 4-nitro-5-styrylisoxazoles, a popular class of cinnamic ester synthetic equivalent. The reactions proceeded under the catalysis of Cinchona-based phase-transfer catalysts. Functionalised γ-butenolides were obtained in good isolated yields and moderate enantioselectivity (up to 74% ee).
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2
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Nagaraju S, Sathish K, Kashinath D. Applications of 3,5‐Dialkyl‐4‐nitroisoxazoles and Their Derivatives in Organic Synthesis
#. ChemistrySelect 2021. [DOI: 10.1002/slct.202101719] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sakkani Nagaraju
- Department of Chemistry National Institute of Technology Warangal-506 004 India 2677
| | - Kota Sathish
- Department of Chemistry National Institute of Technology Warangal-506 004 India 2677
| | - Dhurke Kashinath
- Department of Chemistry National Institute of Technology Warangal-506 004 India 2677
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3
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Kowalczyk-Dworak D, Kwit M, Albrecht Ł. Allylic-Allylic Alkylation with 3,5-Dimethyl-4-nitroisoxazole: A Route to Dicarboxylic Acid Derivatives. J Org Chem 2020; 85:2938-2944. [PMID: 32040920 PMCID: PMC7497636 DOI: 10.1021/acs.joc.9b02530] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
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In this work, the
first application of 3,5-dimethyl-4-nitroisoxazole as a vinylogous
pronucleophile in the allylic–allylic alkylation of Morita–Baylis–Hillman
(MBH) carbonates is described. The reaction has been realized under
nucleophilic catalysis conditions with dimeric cinchona alkaloids,
providing excellent enantiocontrol of the process. The usefulness
of the products thus obtained has been confirmed in selected chemoselective
reactions. The most important one involves the transformation of the
isoxazole moiety into a carboxylic acid group, thus opening access
to dicarboxylic acid derivatives.
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Affiliation(s)
- Dorota Kowalczyk-Dworak
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Żeromskiego 116, 90-924 Łódź, Poland
| | - Marcin Kwit
- Department of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland
| | - Łukasz Albrecht
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Żeromskiego 116, 90-924 Łódź, Poland
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4
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Li L, Zhu B, Fan H, Jiang Z, Chang J. Direct organocatalytic asymmetric Michael reaction of fluorine hemiaminal-type nucleophile to 4-nitro-5-styrylisoxazoles. Org Chem Front 2020. [DOI: 10.1039/d0qo00348d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Herein, we report a chiral bifunctional thiourea catalyzed asymmetric Michael addition reaction between 2-(trifluoromethyl)oxazol-5(2H)-one as a direct C-2-position nucleophile to 4-nitro-5-styrylisoxazoles for the first time.
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Affiliation(s)
- Luyao Li
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
| | - Bo Zhu
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
| | - Huihui Fan
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
| | - Zhiyong Jiang
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
| | - Junbiao Chang
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
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5
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Zhu B, Lu B, Zhang H, Xu X, Jiang Z, Chang J. Phase-Transfer-Catalyzed, Enantioselective Vinylogous Conjugate Addition–Cyclization of Olefinic Azlactones To Access Multifunctionalized Chiral Cyclohexenones. Org Lett 2019; 21:3271-3275. [DOI: 10.1021/acs.orglett.9b01001] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Bo Zhu
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P.R. China
| | - Bohua Lu
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P.R. China
| | - Huifang Zhang
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P.R. China
| | - Xinyao Xu
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P.R. China
| | - Zhiyong Jiang
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P.R. China
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Jinming Campus, Kaifeng, Henan 475004, P.R. China
| | - Junbiao Chang
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P.R. China
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6
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Xia X, Zhu Q, Wang J, Chen J, Cao W, Zhu B, Wu X. Direct Asymmetric Vinylogous Mannich Addition of 3,5-Disubstituted-4-nitroisoxazoles to Isatin-Derived Imines Catalyzed by a Bifunctional Phase-Transfer-Catalyst. J Org Chem 2018; 83:14617-14625. [PMID: 30411890 DOI: 10.1021/acs.joc.8b02439] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Asymmetric Mannich-type addition of 3,5-disubstituted-4-nitroisoxazoles to isatin-derived Boc-protected imines has been realized by using 0.01 equiv of amide phosphonium salt as a phase transfer catalyst. Our current methodology allows for the formation of 3-isoxazolylmethyl-substituted 3-aminooxindoles in excellent yields with good to excellent enantioselectivities. The practical value of this methodology was exemplified by a gram-scale synthesis of 5an, a key intermediate for the formal synthesis (+)-AG-041R.
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Affiliation(s)
- Xuejian Xia
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, College of Sciences , Shanghai University , 99 Shangda Lu , Shanghai 200444 , China
| | - Qiongqiong Zhu
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, College of Sciences , Shanghai University , 99 Shangda Lu , Shanghai 200444 , China
| | - Jing Wang
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, College of Sciences , Shanghai University , 99 Shangda Lu , Shanghai 200444 , China
| | - Jie Chen
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, College of Sciences , Shanghai University , 99 Shangda Lu , Shanghai 200444 , China
| | - Weiguo Cao
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, College of Sciences , Shanghai University , 99 Shangda Lu , Shanghai 200444 , China
| | - Bo Zhu
- School of Chemistry and Chemical Engineering , Henan Normal University , Xinxiang 453007 , China
| | - Xiaoyu Wu
- Center for Supramolecular Chemistry and Catalysis and Department of Chemistry, College of Sciences , Shanghai University , 99 Shangda Lu , Shanghai 200444 , China
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7
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Zhu B, Li F, Lu B, Chang J, Jiang Z. Organocatalytic Enantioselective Vinylogous Aldol Reaction of 5-Alkyl-4-Nitroisoxazoles to Paraformaldehyde. J Org Chem 2018; 83:11350-11358. [DOI: 10.1021/acs.joc.8b01573] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Bo Zhu
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Fuyuan Li
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Kaifeng, Henan 475004, P. R. China
| | - Bohua Lu
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Junbiao Chang
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Zhiyong Jiang
- Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
- Key Laboratory of Natural Medicine and Immuno-Engineering of Henan Province, Henan University, Kaifeng, Henan 475004, P. R. China
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8
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Sharma V, Bhardwaj VK, Chimni SS. Stereoselective Organocatalytic Synthesis of
γ,γ‐
Disubstituted Butenolides. ChemistrySelect 2018. [DOI: 10.1002/slct.201801217] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Vivek Sharma
- Department of ChemistryU.G.C. Centre of Advanced StudiesGuru Nanak Dev University Amritsar 143005 India
| | - Vimal K. Bhardwaj
- Department of ChemistryIndian Institute of Technology Ropar Nangal Road Rupnagar 140001 India
| | - Swapandeep S. Chimni
- Department of ChemistryU.G.C. Centre of Advanced StudiesGuru Nanak Dev University Amritsar 143005 India
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9
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Rout S, Joshi H, Singh VK. Asymmetric Construction of Remote Vicinal Quaternary and Tertiary Stereocenters via Direct Doubly Vinylogous Michael Addition. Org Lett 2018; 20:2199-2203. [DOI: 10.1021/acs.orglett.8b00493] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Subhrajit Rout
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
| | - Harshit Joshi
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
| | - Vinod K. Singh
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, UP, India
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal 462 066, MP, India
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10
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Lee HJ, Eun B, Sung E, Hwang GT, Ko YK, Cho CW. Catalytic enantioselective synthesis of carboxy-substituted 2-isoxazolines by cascade oxa-Michael-cyclization. Org Biomol Chem 2018; 16:657-664. [PMID: 29303197 DOI: 10.1039/c7ob02722b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
An efficient quinidine-based phase-transfer-catalyzed enantioselective cascade oxa-Michael-cyclization reaction of hydroxylamine with various β-carboxy-substituted α,β-unsaturated ketones has been achieved for the preparation of chiral carboxy-substituted 2-isoxazolines. This cascade reaction provided the desired products in good yields (up to 98%) with excellent enantioselectivities (91-96% ee). In addition, the cascade reaction was effectively applied to the first catalytic asymmetric synthesis of the herbicide (S)-methiozolin.
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Affiliation(s)
- Hyo-Jun Lee
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu 41566, Republic of Korea.
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11
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Zhu B, Lee R, Yin Y, Li F, Coote ML, Jiang Z. Enantioselective Vinylogous Amination of 5-Alkyl-4-nitroisoxazoles with a Dipeptide-Based Guanidinium Phase-Transfer Catalyst. Org Lett 2018; 20:429-432. [DOI: 10.1021/acs.orglett.7b03759] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Bo Zhu
- Key
Laboratory of Natural Medicine and Immuno-Engineering, Henan University, Kaifeng, Henan, 475004, P. R. China
- School
of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan, 453007, P. R. China
| | - Richmond Lee
- ARC Centre of Excellence for Electromaterials Research & Research School of Chemistry, Australian National University, Canberra ACT, 2601, Australia
- Singapore University of Technology and Design, 8 Somapah Road, Singapore 487372, Singapore
| | - Yanli Yin
- Key
Laboratory of Natural Medicine and Immuno-Engineering, Henan University, Kaifeng, Henan, 475004, P. R. China
| | - Fuyuan Li
- Key
Laboratory of Natural Medicine and Immuno-Engineering, Henan University, Kaifeng, Henan, 475004, P. R. China
| | - Michelle L. Coote
- ARC Centre of Excellence for Electromaterials Research & Research School of Chemistry, Australian National University, Canberra ACT, 2601, Australia
| | - Zhiyong Jiang
- Key
Laboratory of Natural Medicine and Immuno-Engineering, Henan University, Kaifeng, Henan, 475004, P. R. China
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12
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Cortigiani M, Tampieri A, Monasterolo C, Mereu A, Adamo MF. Preparation and reactivity of sterically encumbered organocatalysts and their use in the preparation of ( S )-Pregabalin precursors. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.09.067] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Zhang W, Su Y, Wang KH, Wu L, Chang B, Shi Y, Huang D, Hu Y. Trichloroisocyanuric Acid Promoted Cascade Cyclization/Trifluoromethylation of Allylic Oximes: Synthesis of Trifluoromethylated Isoxazolines. Org Lett 2017; 19:376-379. [DOI: 10.1021/acs.orglett.6b03582] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Weigang Zhang
- College
of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Yingpeng Su
- College
of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Ke-Hu Wang
- College
of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Lili Wu
- College
of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Bingbing Chang
- College
of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Ya Shi
- College
of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Danfeng Huang
- College
of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
| | - Yulai Hu
- College
of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning East Road, Lanzhou 730070, P. R. China
- State
Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China
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14
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Liu K, Xiong Y, Wang ZF, Tao HY, Wang CJ. Ligand-controlled stereodivergent 1,3-dipolar cycloaddition of azomethine ylides with 3-methyl-4-nitro-5-styrylisoxazoles. Chem Commun (Camb) 2016; 52:9458-61. [DOI: 10.1039/c6cc03169b] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
An unprecedented Ag(i)-catalyzed ligand-controlled stereodivergent 1,3-dipolar cycloaddition of azomethine ylides with 3-methyl-4-nitro-5-styrylisoxazoles has been developed to afford heterocycles bearing both methylisoxazole and pyrrolidine moieties.
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Affiliation(s)
- Kang Liu
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- China
| | - Yong Xiong
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- China
| | - Zuo-Fei Wang
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- China
| | - Hai-Yan Tao
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- China
| | - Chun-Jiang Wang
- College of Chemistry and Molecular Sciences
- Wuhan University
- Wuhan 430072
- China
- State Key Laboratory of Organometallic Chemistry
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15
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Moccia M, Cortigiani M, Monasterolo C, Torri F, Del Fiandra C, Fuller G, Kelly B, Adamo MFA. Development and Scale-up of an Organocatalytic Enantioselective Process to Manufacture (S)-Pregabalin. Org Process Res Dev 2015. [DOI: 10.1021/acs.oprd.5b00160] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Maria Moccia
- Centre
for Synthesis and Chemical Biology (CSCB), Royal College of Surgeons in Ireland (RCSI), 123 St. Stephen’s Green, Dublin 2, Ireland
| | - Mauro Cortigiani
- Centre
for Synthesis and Chemical Biology (CSCB), Royal College of Surgeons in Ireland (RCSI), 123 St. Stephen’s Green, Dublin 2, Ireland
| | - Claudio Monasterolo
- Centre
for Synthesis and Chemical Biology (CSCB), Royal College of Surgeons in Ireland (RCSI), 123 St. Stephen’s Green, Dublin 2, Ireland
| | - Federica Torri
- Centre
for Synthesis and Chemical Biology (CSCB), Royal College of Surgeons in Ireland (RCSI), 123 St. Stephen’s Green, Dublin 2, Ireland
| | - Claudia Del Fiandra
- Centre
for Synthesis and Chemical Biology (CSCB), Royal College of Surgeons in Ireland (RCSI), 123 St. Stephen’s Green, Dublin 2, Ireland
| | - Geoffrey Fuller
- Kelada
Pharmachem.
Ltd., 123 St. Stephen’s Green, Dublin 2, Ireland
| | - Brian Kelly
- Kelada
Pharmachem.
Ltd., 123 St. Stephen’s Green, Dublin 2, Ireland
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16
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Hu F, Szostak M. Recent Developments in the Synthesis and Reactivity of Isoxazoles: Metal Catalysis and Beyond. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500319] [Citation(s) in RCA: 220] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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17
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Chauhan P, Mahajan S, Raabe G, Enders D. Organocatalytic one-pot 1,4-/1,6-/1,2-addition sequence for the stereocontrolled formation of six consecutive stereocenters. Chem Commun (Camb) 2015; 51:2270-2. [PMID: 25563802 PMCID: PMC4612129 DOI: 10.1039/c4cc09730k] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
An unprecedented stereoselective organocatalytic one-pot 1,4-/1,6-/1,2-addition sequence between β-dicarbonyl compounds, β-nitroalkenes and 4-nitro-5-styrylisoxazoles sequentially catalyzed by low loading of a squaramide catalyst and an achiral base has been developed. The protocol opens an efficient entry to isoxazole bearing cyclohexanes with six consecutive stereogenic centers including one tetrasubstituted carbon in good yields and excellent diastereo- and enantioselectivities.
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Affiliation(s)
- Pankaj Chauhan
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
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18
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Shibata N. Direct Nucleophilic Difluoromethylation of Aromatic Isoxazoles Activated by Electron-Withdrawing Groups Using (Difluoromethyl)trimethylsilane. SCIENCEOPEN RESEARCH 2014. [DOI: 10.14293/s2199-1006.1.sor-chem.ad1qvw.v2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The activation of aromatic diaryl isoxazoles with strong electron-withdrawing groups, such as the nitro, triflyl and the phenylsulfonyl groups, at the 4-position has enabled the first regio- and diastereoselective difluoromethylation at the 5-position of isoxazoles by nucleophilic addition using (difluoromethyl)trimethylsilane, Me3SiCF2H, to provide difluoromethylated isoxazolines in good yields. Conjugated styryl-4-nitroisoxazoles were also nicely converted into the corresponding CF2H adducts with high regio- and excellent diastereoselectivities. Since the trifluoromethylated analogues of the corresponding diaryl-isoxazolines are effective ectoparasiticides, represented by fluralaner, should a series of difluoromethylated isoxazolines be obtained, they would be of great importance as promising drug candidates in this field.
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19
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Direct Nucleophilic Difluoromethylation of Aromatic Isoxazoles Activated by Electron-Withdrawing Groups Using (Difluoromethyl)trimethylsilane. SCIENCEOPEN RESEARCH 2014. [DOI: 10.14293/s2199-1006.1.sor-chem.ad1qvw.v1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
The activation of aromatic diaryl isoxazoles with strong electron-withdrawing groups, such as the nitro, triflyl and the phenylsulfonyl groups, at the 4-position has enabled the first regio- and diastereoselective difluoromethylation at the 5-position of isoxazoles by nucleophilic addition using (difluoromethyl)trimethylsilane, Me3SiCF2H, to provide difluoromethylated isoxazolines in good yields. Conjugated styryl-4-nitroisoxazoles were also nicely converted into the corresponding CF2H adducts with high regio- and excellent diastereoselectivities. Since the trifluoromethylated analogues of the corresponding diaryl-isoxazolines are effective ectoparasiticides, represented by fluralaner, should a series of difluoromethylated isoxazolines be obtained, they would be of great importance as promising drug candidates in this field.
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20
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Li Y, López-Delgado FJ, Jørgensen DKB, Nielsen RP, Jiang H, Jørgensen KA. Trienamine-mediated asymmetric [4+2]-cycloaddition of α,β-unsaturated ester surrogates applying 4-nitro-5-styrylisoxazoles. Chem Commun (Camb) 2014; 50:15689-91. [DOI: 10.1039/c4cc08171d] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Kawai H, Sugita Y, Tokunaga E, Sato H, Shiro M, Shibata N. Diastereoselective additive trifluoromethylation/halogenation of isoxazole triflones: synthesis of all-carbon-functionalized trifluoromethyl isoxazoline triflones. ChemistryOpen 2014; 3:14-8. [PMID: 24688889 PMCID: PMC3943607 DOI: 10.1002/open.201300044] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Indexed: 11/08/2022] Open
Abstract
Highly functionalized 5-trifluoromethyl-2-isoxazoline derivatives featuring a triflyl (SO2CF3) group at the 4-position were successfully synthesized via diastereoselective trifluoromethylation and halogenation of isoxazole triflones using the Ruppert- Prakash reagent. The trifluoromethylation is quite general in terms of the substrates including 3,5-diaryl isoxazole triflones and 3-aryl-5-styrylisoxazole triflones to provide products in high yields with excellent diastereoselectivities. The highly functionalized 5-trifluoromethyl-2-isoxazoline derivatives are expected to be a new class of antiparasiticides. Thus the triflyl group both activates isoxazoles and the 4-postion of CF3 adducts, and has a potential biological function.
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Affiliation(s)
- Hiroyuki Kawai
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology Gokiso, Showa-ku, Nagoya 466-8555 (Japan)
| | - Yutaka Sugita
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology Gokiso, Showa-ku, Nagoya 466-8555 (Japan)
| | - Etsuko Tokunaga
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology Gokiso, Showa-ku, Nagoya 466-8555 (Japan)
| | - Hiroyasu Sato
- Rigaku Corporation, 3-9-12 Mastubara-cho Akishima, Tokyo 196-8666 (Japan)
| | - Motoo Shiro
- Rigaku Corporation, 3-9-12 Mastubara-cho Akishima, Tokyo 196-8666 (Japan)
| | - Norio Shibata
- Department of Frontier Materials, Graduate School of Engineering, Nagoya Institute of Technology Gokiso, Showa-ku, Nagoya 466-8555 (Japan)
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Zhang J, Liu X, Ma X, Wang R. Organocatalyzed asymmetric vinylogous Michael addition of α,β-unsaturated γ-butyrolactam. Chem Commun (Camb) 2013; 49:9329-31. [DOI: 10.1039/c3cc44059a] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Pei QL, Sun HW, Wu ZJ, Du XL, Zhang XM, Yuan WC. Catalytic Asymmetric 1,6-Michael Addition of Arylthiols to 3-Methyl-4-nitro-5-alkenyl-isoxazoles with Bifunctional Catalysts. J Org Chem 2011; 76:7849-59. [DOI: 10.1021/jo2012779] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Qing-Lan Pei
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
- Graduate School of Chinese Academy of Sciences, Beijing, 100049, China
| | - Hong-Wei Sun
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
- Graduate School of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhi-Jun Wu
- Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
| | - Xi-Lin Du
- Department of General Surgery, TangDu Hospital, The Fourth Military Medical University, Xi’an 710038, China
| | - Xiao-Mei Zhang
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Wei-Cheng Yuan
- National Engineering Research Center of Chiral Drugs, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
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Kawai H, Tachi K, Tokunaga E, Shiro M, Shibata N. Trifluoromethylation of Aromatic Isoxazoles: Regio- and Diastereoselective Route to 5-Trifluoromethyl-2-isoxazolines. Angew Chem Int Ed Engl 2011; 50:7803-6. [DOI: 10.1002/anie.201102442] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kawai H, Tachi K, Tokunaga E, Shiro M, Shibata N. Trifluoromethylation of Aromatic Isoxazoles: Regio- and Diastereoselective Route to 5-Trifluoromethyl-2-isoxazolines. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201102442] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Hu WX, Li PR, Jiang G, Che CM, Chen J. A Mild Catalytic Oxidation System: Ruthenium Porphyrin and 2,6-Dichloropyridine N-Oxide Applied for Alkene Dihydroxylation. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000455] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Adamo MF, Suresh S, Piras L. Reaction of 5-(1-bromo-2-aryl-vinyl)-3-methyl-4-nitro-isoxazoles and 1,3-dicarbonyl compounds. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.04.058] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Adamo MF, Bruschi S, Suresh S, Piras L. Aziridination of 3-methyl-4-nitro-5-styrylisoxazoles. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.10.061] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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