1
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Liashuk OS, Ryzhov IA, Hryshchuk OV, Volovenko YM, Grygorenko OO. [3+2] Cycloaddition of Alkynyl Boronates and in situ Generated Azomethine Ylide. Chemistry 2024; 30:e202303504. [PMID: 38059680 DOI: 10.1002/chem.202303504] [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: 10/24/2023] [Revised: 12/06/2023] [Accepted: 12/07/2023] [Indexed: 12/08/2023]
Abstract
Scalable [3+2] cycloaddition of alkynyl boronates and in situ generated unstabilized azomethine ylide is reported for the first time. The selective formation of either 1 : 1 or 1 : 2 cycloaddition products was achieved by carefully optimizing the reaction conditions, mainly by controlling the reactant stoichiometry, catalyst loading, and internal temperature. The developed protocol tolerated many valuable functional groups, including TMS, protected alcohol (as ether or THP derivatives), or aldehyde (as acetal). Further common C-C and C-heteroatom bond-forming reactions, as well as scaled-up procedures demonstrate the utility of the prepared compounds as building blocks for organic synthesis and drug discovery.
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Affiliation(s)
- Oleksandr S Liashuk
- Enamine Ltd., Winston Churchill Street 78, Kyїv, 02094, Ukraine
- Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyїv, 01601, Ukraine
| | - Ihor A Ryzhov
- Enamine Ltd., Winston Churchill Street 78, Kyїv, 02094, Ukraine
- Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyїv, 01601, Ukraine
| | - Oleksandr V Hryshchuk
- Enamine Ltd., Winston Churchill Street 78, Kyїv, 02094, Ukraine
- Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyїv, 01601, Ukraine
| | - Yulian M Volovenko
- Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyїv, 01601, Ukraine
| | - Oleksandr O Grygorenko
- Enamine Ltd., Winston Churchill Street 78, Kyїv, 02094, Ukraine
- Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyїv, 01601, Ukraine
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2
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Li J, Tanaka H, Imagawa T, Tsushima T, Nakamoto M, Tan J, Yoshida H. Ethynyl-B(dan) in [3+2] Cycloaddition and Larock Indole Synthesis: Synthesis of Stable Boron-Containing Heteroaromatic Compounds. Chemistry 2024; 30:e202303403. [PMID: 38109084 DOI: 10.1002/chem.202303403] [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: 10/16/2023] [Indexed: 12/19/2023]
Abstract
The cycloaddition of nitrile oxides with ethynyl-B(dan) (dan=naphthalene-1,8-diaminato) allowed the facile preparation of diverse isoxazolyl-B(dan) compounds, all of which displayed excellent protodeborylation-resistant properties. The dan-installation on the boron center proves vital to the high stability of the products as well as the perfect regioselectivity arising from hydrogen bond-directed orientation in the cycloaddition. The diminished boron-Lewis acidity of ethynyl-B(dan) also renders it amenable to azide-alkyne cycloaddition, Larock indole synthesis and related heteroannulations. The obtained boron-containing triazole, indoles, benzofuran and indenone exhibit sufficient resistance toward protodeborylation. Despite the commonly accepted transmetalation-inactive property derived from the diminished Lewis acidity, the synthesized heteroaryl-B(dan) compound was still found to be convertible to the oligoarene via sequential Suzuki-Miyaura coupling.
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Affiliation(s)
- Jialun Li
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, 739-8526, Japan
| | - Hideya Tanaka
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, 739-8526, Japan
| | - Taiki Imagawa
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, 739-8526, Japan
| | - Takumi Tsushima
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, 739-8526, Japan
| | - Masaaki Nakamoto
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, 739-8526, Japan
| | - Jiajing Tan
- College of Chemistry, Beijing University of Chemical Technology (BUCT), Beijing, 100029, China
| | - Hiroto Yoshida
- Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima, 739-8526, Japan
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3
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Liashuk OS, Ryzhov IA, Hryshchuk OV, Vashchenko BV, Melnychuk PV, Volovenko YM, Grygorenko OO. Synthesis of 3‐Borylated Pyrrolidines by 1,3‐Dipolar Cycloaddition of Alkenyl Boronates and Azomethine Ylide. Chemistry 2022; 28:e202202117. [DOI: 10.1002/chem.202202117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Indexed: 12/13/2022]
Affiliation(s)
- Oleksandr S. Liashuk
- Enamine Ltd. Chervonotkatska Street 78 Kyiv 02094 Ukraine
- Taras Shevchenko National University of Kyiv Volodymyrska Street 60 Kyiv 01601 Ukraine
| | - Ihor A. Ryzhov
- Enamine Ltd. Chervonotkatska Street 78 Kyiv 02094 Ukraine
- Taras Shevchenko National University of Kyiv Volodymyrska Street 60 Kyiv 01601 Ukraine
| | - Oleksandr V. Hryshchuk
- Enamine Ltd. Chervonotkatska Street 78 Kyiv 02094 Ukraine
- Taras Shevchenko National University of Kyiv Volodymyrska Street 60 Kyiv 01601 Ukraine
| | - Bohdan V. Vashchenko
- Enamine Ltd. Chervonotkatska Street 78 Kyiv 02094 Ukraine
- Taras Shevchenko National University of Kyiv Volodymyrska Street 60 Kyiv 01601 Ukraine
| | | | - Yulian M. Volovenko
- Taras Shevchenko National University of Kyiv Volodymyrska Street 60 Kyiv 01601 Ukraine
| | - Oleksandr O. Grygorenko
- Enamine Ltd. Chervonotkatska Street 78 Kyiv 02094 Ukraine
- Taras Shevchenko National University of Kyiv Volodymyrska Street 60 Kyiv 01601 Ukraine
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4
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Madhavan S, Keshri SK, Kapur M. Transition Metal‐Mediated Functionalization of Isoxazoles: A Review. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100560] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Suchithra Madhavan
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal Bypass Road Bhopal 462066, MP India
| | - Santosh Kumar Keshri
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal Bypass Road Bhopal 462066, MP India
| | - Manmohan Kapur
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal Bypass Road Bhopal 462066, MP India
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5
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Nandy S, Paul S, Das KK, Kumar P, Ghorai D, Panda S. Synthesis and reactivity of alkynyl boron compounds. Org Biomol Chem 2021; 19:7276-7297. [PMID: 34374405 DOI: 10.1039/d1ob00465d] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Over the last century, there have been considerable developments in organoboron chemistry due to the stability, non-toxicity, and easy commercial availability of various boronic esters. Several organoboron reagents have emerged and play an increasingly important role in everyday organic synthesis. Among them, alkynyl boron compounds have attracted significant attention due to their easy synthesis and diverse reactivity. In this review, we summarize the advancement of research on alkynyl boron compounds, highlighting their importance in the synthesis of valuable compounds.
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Affiliation(s)
- Soumilee Nandy
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
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6
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Mondal S, Biswas S, Ghosh KG, Sureshkumar D. TEMPO-Mediated Selective Synthesis of Isoxazolines, 5-Hydroxy-2-isoxazolines, and Isoxazoles via Aliphatic δ-C(sp3)-H Bond Oxidation of Oximes. Chem Asian J 2021; 16:2439-2446. [PMID: 34190407 DOI: 10.1002/asia.202100572] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 06/20/2021] [Indexed: 12/20/2022]
Abstract
Selective synthesis of three different bioactive heterocycles; isoxazolines, 5-hydroxy-2-isoxazolines and isoxazoles from the same starting material using TEMPO (2,2,6,6-Tetramethylpiperidin-1-oxyl) as a radical initiator is reported. Selectivity was achieved using different oxidants with TEMPO. The reaction goes through a 1,5-HAT (hydrogen atom transfer) process resulting in products with good yields. This strategy offers a straightforward route to three different heterocycles from oximes via radical-mediated C(sp3 )-H oxidation.
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Affiliation(s)
- Santanu Mondal
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, West Bengal, 741246, India.,Okinawa Institute of Science and Technology Graduate University (OIST), Okinawa, Japan
| | - Sourabh Biswas
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, West Bengal, 741246, India
| | - Krishna Gopal Ghosh
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, West Bengal, 741246, India
| | - Devarajulu Sureshkumar
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, West Bengal, 741246, India
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8
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Kandula V, Bandaru SK, Balakrishna C, Chatterjee A, Yennam S, Saunders GC, Behera M. Synthesis of 3,4,5‐Trisubstituted Isoxazoles via the ANRORC Rearrangement. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001103] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Venu Kandula
- GVK Biosciences Pvt. Ltd.Survey Nos: 125 (part) & 126 Chemistry Services 500076 Telangana Hyderabad India
- Department of chemistry Koneru Lakshmaiah education foundation 522502 Andra Pradesh Vaddeswaram Guntur India
| | | | - C. Balakrishna
- GVK Biosciences Pvt. Ltd.Survey Nos: 125 (part) & 126 Chemistry Services 500076 Telangana Hyderabad India
| | - Anindita Chatterjee
- Department of chemistry Koneru Lakshmaiah education foundation 522502 Andra Pradesh Vaddeswaram Guntur India
- Department of Chemistry Raghu Engineering college Visakhapatnam Andra Pradesh 530048 India
| | - Satyanarayana Yennam
- GVK Biosciences Pvt. Ltd.Survey Nos: 125 (part) & 126 Chemistry Services 500076 Telangana Hyderabad India
| | | | - Manoranjan Behera
- GVK Biosciences Pvt. Ltd.Survey Nos: 125 (part) & 126 Chemistry Services 500076 Telangana Hyderabad India
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9
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Kamlah A, Bracher F. A Novel Approach to Highly Substituted β‐Carbolines via Reductive Ring Transformation of 2‐Acyl‐3‐isoxazolylindoles. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000230] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Alexandra Kamlah
- Department of Pharmacy Center for Drug Research Ludwig‐Maximilians University Butenandtstr. 5‐13 81377 Munich Germany
| | - Franz Bracher
- Department of Pharmacy Center for Drug Research Ludwig‐Maximilians University Butenandtstr. 5‐13 81377 Munich Germany
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10
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Kaloğlu M, Özdemir İ. The direct C4-arylation of 3,5-dimethylisoxazole with aryl bromides catalyzed by imidazolidin-2-ylidene based palladium-PEPPSI complexes. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119454] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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11
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Zheng R, Feng F, Zhang Z, Fu J, Su Q, Zhang Y, Gu Q. Microwave-assisted efficient synthesis of 3-substituted bis-isoxazole ether bearing 2-chloro-3-pyridyl via 1,3-dipolar cycloaddition. Mol Divers 2019; 24:423-435. [PMID: 31309395 DOI: 10.1007/s11030-019-09973-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Accepted: 07/03/2019] [Indexed: 12/01/2022]
Abstract
An efficient strategy for synthesizing of 3-substituted bis-isoxazole ether bearing 2-chloro-3-pyridyl under microwave radiation was reported. The reactive regioselectivity was improved by changing mainly the solvent and acid-binding agent. 3-(2-Chloropyridin-3-yl)-5-(((3-substituted phenyl isoxazol-5-yl)methoxy)methyl)isoxazoles were synthesized in 31-92% yields and were characterized by FT-IR, HRMS, 1H and 13C NMR spectroscopy. The single crystal of 3-(2-chloropyridin-3-yl)-5-(((3-(p-tolyl)isoxazol-5-yl)methoxy)methyl)isoxazole was obtained, and the structure of compound has also been determined by X-ray diffraction technique. Weak intra- and intermolecular C-H∙∙∙O interactions and a C-H∙∙∙π interaction link molecules into a three-dimensional network. The results showed that the synthesized compounds belonged to triclinic system, and their regioselectivity depended on the solvent and acid-binding agent. The merits of this method include the environmentally friendly, efficient, simple operation, and higher regional selectivity. An efficient synthesis of 3-substituted bis-isoxazole ethers was developed via 1,3-dipolar cycloaddition reaction starting from 3-substituted phenyl-5-((prop-2-yn-1-yloxy))methyl)isoxazoles and (Z)-2-chloro-N-hydroxynicotinimidoyl chloride using NaHCO3 as an acid-binding agent in THF solvent-dissolved trace water under catalyst-free microwave-assisted conditions.
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Affiliation(s)
- Ran Zheng
- College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China
| | - Fan Feng
- College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China
| | - Zhihui Zhang
- College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China
| | - Jiaxu Fu
- College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China
| | - Qing Su
- College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China
| | - Yumin Zhang
- College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China
| | - Qiang Gu
- College of Chemistry, Jilin University, Changchun, 130012, People's Republic of China.
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12
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Base-promoted 1,3-dipolar cycloaddition reaction of nitrile oxides with methyl 1,4-dioxo-1,4-dihydronaphthalene-2-carboxylate for the construction of naphtho[2,3- d ]isoxazole-4,9(3a H ,9a H )-diones. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.04.077] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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13
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Roscales S, Bechmann N, Weiss DH, Köckerling M, Pietzsch J, Kniess T. Novel valdecoxib derivatives by ruthenium(ii)-promoted 1,3-dipolar cycloaddition of nitrile oxides with alkynes - synthesis and COX-2 inhibition activity. MEDCHEMCOMM 2018; 9:534-544. [PMID: 30108944 DOI: 10.1039/c7md00575j] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Accepted: 02/12/2018] [Indexed: 12/30/2022]
Abstract
Novel valdecoxib-based cyclooxygenase-2 inhibitors were synthesized in one step via 1,3-dipolar cycloaddition of nitrile oxides with a series of eleven aryl alkynes, six of them described for the first time. Application of Ru(ii)-catalysis leads preferably to the formation of the 3,4-diaryl-substituted isoxazoles, while under thermal heating with base the 3,5-diaryl substitution pattern is favoured. The new the 3,4-diaryl-substituted isoxazoles possessing a small substituent (H and Me) displayed high COX-2 inhibition affinity (IC50 = 0.042-0.073 μM) and excellent selectivity (COX-2 SI > 2000). In contrast, the 3,5-diaryl substituted compounds displayed almost no COX activity. The introduction of a 4-fluorophenyl substituent resulted in retained high COX-2 affinity, making these compounds together with the feasible one step reaction promising candidates for the development of fluorine-18 labelled radiotracers.
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Affiliation(s)
- Silvia Roscales
- Department of Radiopharmaceutical and Chemical Biology , Helmholtz-Zentrum Dresden-Rossendorf , Institute of Radiopharmaceutical Cancer Research , Bautzner Landstraße 400 , 01328 Dresden , Germany .
| | - Nicole Bechmann
- Department of Radiopharmaceutical and Chemical Biology , Helmholtz-Zentrum Dresden-Rossendorf , Institute of Radiopharmaceutical Cancer Research , Bautzner Landstraße 400 , 01328 Dresden , Germany .
| | - Daniel Holger Weiss
- Department of Inorganic Solid State Chemistry , Institute of Chemistry , University of Rostock , Albert Einstein Straße 3a , 18059 Rostock , Germany
| | - Martin Köckerling
- Department of Inorganic Solid State Chemistry , Institute of Chemistry , University of Rostock , Albert Einstein Straße 3a , 18059 Rostock , Germany
| | - Jens Pietzsch
- Department of Radiopharmaceutical and Chemical Biology , Helmholtz-Zentrum Dresden-Rossendorf , Institute of Radiopharmaceutical Cancer Research , Bautzner Landstraße 400 , 01328 Dresden , Germany . .,Department of Chemistry and Food Chemistry , Technische Universität Dresden , Bergstraße 66 , 01062 Dresden , Germany
| | - Torsten Kniess
- Department of Radiopharmaceutical and Chemical Biology , Helmholtz-Zentrum Dresden-Rossendorf , Institute of Radiopharmaceutical Cancer Research , Bautzner Landstraße 400 , 01328 Dresden , Germany .
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14
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Svejstrup TD, Zawodny W, Douglas JJ, Bidgeli D, Sheikh NS, Leonori D. Visible-light-mediated generation of nitrile oxides for the photoredox synthesis of isoxazolines and isoxazoles. Chem Commun (Camb) 2018; 52:12302-12305. [PMID: 27711298 DOI: 10.1039/c6cc06029c] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Visible-light photoredox catalysis enables the synthesis of biologically relevant isoxazolines and isoxazoles from hydroxyimino acids. The process shows broad functional group compatibility and mechanistic and computational studies support a visible-light-mediated generation of nitrile oxides by two sequential oxidative single electron transfer processes.
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Affiliation(s)
- Thomas D Svejstrup
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| | - Wojciech Zawodny
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| | - James J Douglas
- AstraZeneca, Silk Road Business Park, Macclesfield SK10 2NA, UK
| | - Damon Bidgeli
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
| | - Nadeem S Sheikh
- Department of Chemistry, Faculty of Science, King Faisal University, Al-Ahsa 31982, Saudi Arabia
| | - Daniele Leonori
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
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15
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Huang H, Li F, Xu Z, Cai J, Ji X, Deng GJ. Base-Promoted [3+2]-Annulation of Oxime Esters and Aldehydes for Rapid Isoxazoline Formation. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700730] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Huawen Huang
- Key Laboratory of Environmentally Friendly Chemistry; Application of Ministry of Education; College of Chemistry; Xiangtan University; Xiangtan People's Republic of China
| | - Feifei Li
- Key Laboratory of Environmentally Friendly Chemistry; Application of Ministry of Education; College of Chemistry; Xiangtan University; Xiangtan People's Republic of China
| | - Zhenhua Xu
- Key Laboratory of Environmentally Friendly Chemistry; Application of Ministry of Education; College of Chemistry; Xiangtan University; Xiangtan People's Republic of China
| | - Jinhui Cai
- Key Laboratory of Environmentally Friendly Chemistry; Application of Ministry of Education; College of Chemistry; Xiangtan University; Xiangtan People's Republic of China
| | - Xiaochen Ji
- Key Laboratory of Environmentally Friendly Chemistry; Application of Ministry of Education; College of Chemistry; Xiangtan University; Xiangtan People's Republic of China
| | - Guo-Jun Deng
- Key Laboratory of Environmentally Friendly Chemistry; Application of Ministry of Education; College of Chemistry; Xiangtan University; Xiangtan People's Republic of China
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16
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Vitale P, Scilimati A. Recent Developments in the Chemistry of 3-Arylisoxazoles and 3-Aryl-2-isoxazolines. ADVANCES IN HETEROCYCLIC CHEMISTRY 2017. [DOI: 10.1016/bs.aihch.2016.10.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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17
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Lin B, Yu P, He CQ, Houk KN. Origins of regioselectivity in 1,3-dipolar cycloadditions of nitrile oxides with alkynylboronates. Bioorg Med Chem 2016; 24:4787-4790. [PMID: 27501912 DOI: 10.1016/j.bmc.2016.07.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 07/15/2016] [Accepted: 07/16/2016] [Indexed: 11/16/2022]
Abstract
Density functional theory (M06-2X) studies of the regioselectivity of 1,3-dipolar cycloaddition reactions of benzo and mesitonitrile oxides with alkynyl pinacol and MIDA boronates are reported. Calculated relative free energies of activation reproduce the experimentally observed product ratios. The electronic energies of activation are found to be mainly controlled by distortion energies required to achieve the transition states. Both electronic and steric effects influence regioselectivities.
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Affiliation(s)
- Bernice Lin
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
| | - Peiyuan Yu
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
| | - Cyndi Qixin He
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA
| | - K N Houk
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA.
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18
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Tu KN, Hirner JJ, Blum SA. Oxyboration with and without a Catalyst: Borylated Isoxazoles via B-O σ-Bond Addition. Org Lett 2016; 18:480-3. [PMID: 26771389 PMCID: PMC4763986 DOI: 10.1021/acs.orglett.5b03530] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Herein
we report an oxyboration reaction with activated substrates
that employs B–O σ bond additions to C–C π
bonds to form borylated isoxazoles, which are potential building blocks
for drug discovery. Although this reaction can be effectively catalyzed
by gold, it is the first example of uncatalyzed oxyboration of C–C
π bonds by B–O σ bonds—and only the second
example that is catalyzed. This oxyboration reaction is tolerant of
groups incompatible with alternative lithiation/borylation and palladium-catalyzed
C–H activation/borylation technologies for the synthesis of
borylated isoxazoles.
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Affiliation(s)
- Kim N Tu
- Department of Chemistry, University of California-Irvine , Irvine, California 92697-2025, United States
| | - Joshua J Hirner
- Department of Chemistry, University of California-Irvine , Irvine, California 92697-2025, United States
| | - Suzanne A Blum
- Department of Chemistry, University of California-Irvine , Irvine, California 92697-2025, United States
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19
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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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20
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Galenko AV, Khlebnikov AF, Novikov MS, Pakalnis VV, Rostovskii NV. Recent advances in isoxazole chemistry. RUSSIAN CHEMICAL REVIEWS 2015. [DOI: 10.1070/rcr4503] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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21
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Chen W, Zhang J, Wang B, Zhao Z, Wang X, Hu Y. Tandem Synthesis of 3-chloro-4-iodoisoxazoles from 1-copper(I) alkynes, dichloroformaldoxime, and molecular iodine. J Org Chem 2015; 80:2413-7. [PMID: 25594794 DOI: 10.1021/jo502634h] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A tandem synthesis for structurally novel 3-chloro-4-iodoisoxazoles was developed by simply mixing 1-copper(I) alkynes, dichloroformaldoxime, and molecular iodine together. The combination of 1-copper(I) alkyne and molecular iodine was well used as a synthetic equivalent of 1-iodoalkyne without the need for tedious preparation, purification, and storage of 1-iodoalkyne.
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Affiliation(s)
- Wenwen Chen
- Department of Chemistry, Tsinghua University , Beijing 100084, P. R. China
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22
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Vivat JF, Bachollet SPJT, Adams H, Harrity JPA. Synthesis, characterisation and reactions of phosphine-substituted alkynylboronates and alkynyltrifluoroborate salts. Molecules 2014; 19:21324-34. [PMID: 25529019 PMCID: PMC6271442 DOI: 10.3390/molecules191221324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Revised: 12/05/2014] [Accepted: 12/11/2014] [Indexed: 11/16/2022] Open
Abstract
The synthesis and structural characterisation of phosphine-substituted alkynylboronates is reported. A P(III)-centred alkynylboronate (2) was prepared that showed little evidence for the conjugation of the P-lone pair to the boron via the alkyne π-system, as judged by X-ray crystallography studies of 2 and a related P(V) compound, 3. In addition, corresponding alkynyltrifluoroborate salts were prepared that showed improved stability by comparison to their boronic ester counterparts. These salts undergo Pd-catalysed cross-coupling reactions with aryl halides.
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Affiliation(s)
- Jérôme F Vivat
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK.
| | | | - Harry Adams
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK.
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23
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Stalling T, Harker WRR, Auvinet AL, Cornel EJ, Harrity JPA. Investigation of Alkyne Regioselectivity in the Ni-Catalyzed Benzannulation of Cyclobutenones. Chemistry 2014; 21:2701-4. [DOI: 10.1002/chem.201405863] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Indexed: 11/09/2022]
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24
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Chen W, Wang B, Liu N, Huang D, Wang X, Hu Y. Tandem Synthesis of 3-Halo-5-Substituted Isoxazoles from 1-Copper(I) Alkynes and Dihaloformaldoximes. Org Lett 2014; 16:6140-3. [DOI: 10.1021/ol503008t] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Wenwen Chen
- Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
| | - Bo Wang
- Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
| | - Nan Liu
- Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
| | - Dayun Huang
- Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
| | - Xinyan Wang
- Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
| | - Yuefei Hu
- Department of Chemistry, Tsinghua University, Beijing 100084, P. R. China
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25
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Song DH, Ryu JS. Synthesis of 3,4,5-Trisubstituted Isoxazoles through Gold-Catalyzed Cascade Cyclization-Oxidative Alkynylation and Cyclization-Fluorination of 2-Alkynone O-Methyloximes. B KOREAN CHEM SOC 2014. [DOI: 10.5012/bkcs.2014.35.9.2635] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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26
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Facile synthesis of novel tetrasubstituted 1-pyrazolines from Baylis–Hillman adducts and acyl diazomethanes. Tetrahedron Lett 2013. [DOI: 10.1016/j.tetlet.2013.05.041] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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28
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Harker WR, Delaney PM, Simms M, Tozer MJ, Harrity JP. Scalable synthesis of functionalised 2-pyridones via [4+2] cycloaddition reactions of 2-pyrazinones and alkynylboronates. Tetrahedron 2013. [DOI: 10.1016/j.tet.2012.12.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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29
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Kirkham JD, Edeson SJ, Stokes S, Harrity JPA. Synthesis of Ynone Trifluoroborates toward Functionalized Pyrazoles. Org Lett 2012; 14:5354-7. [DOI: 10.1021/ol302418b] [Citation(s) in RCA: 95] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- James D. Kirkham
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, S3 7HF, United Kingdom, and Research and Development, AstraZeneca, Alderley Park, Macclesfield, SK10 4TG, United Kingdom
| | - Steven J. Edeson
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, S3 7HF, United Kingdom, and Research and Development, AstraZeneca, Alderley Park, Macclesfield, SK10 4TG, United Kingdom
| | - Stephen Stokes
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, S3 7HF, United Kingdom, and Research and Development, AstraZeneca, Alderley Park, Macclesfield, SK10 4TG, United Kingdom
| | - Joseph P. A. Harrity
- Department of Chemistry, University of Sheffield, Brook Hill, Sheffield, S3 7HF, United Kingdom, and Research and Development, AstraZeneca, Alderley Park, Macclesfield, SK10 4TG, United Kingdom
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30
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Ueda M, Sugita S, Sato A, Miyoshi T, Miyata O. Copper-Catalyzed Synthesis of Trisubstituted Isoxazoles via a Cascade Cyclization–Migration Process. J Org Chem 2012; 77:9344-51. [DOI: 10.1021/jo301358h] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Masafumi Ueda
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558,
Japan
| | - Shoichi Sugita
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558,
Japan
| | - Aoi Sato
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558,
Japan
| | - Tetsuya Miyoshi
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558,
Japan
| | - Okiko Miyata
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558,
Japan
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31
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Lokhande PD, Hasanzadeh K, Khaledi H, Ali HM. Regioselective synthesis of 3,5-diaryl-4-methylisoxazoles. MONATSHEFTE FUR CHEMIE 2012. [DOI: 10.1007/s00706-012-0782-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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32
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Kirkham JD, Butlin RJ, Harrity JPA. A Mild Benzannulation through Directed Cycloaddition Reactions. Angew Chem Int Ed Engl 2012; 51:6402-5. [PMID: 22593036 DOI: 10.1002/anie.201200917] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2012] [Indexed: 11/07/2022]
Affiliation(s)
- James D Kirkham
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
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33
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Kirkham JD, Butlin RJ, Harrity JPA. A Mild Benzannulation through Directed Cycloaddition Reactions. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201200917] [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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34
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Harding SL, Marcuccio SM, Savage GP. Aryl nitrile oxide cycloaddition reactions in the presence of pinacol boronic acid ester. Beilstein J Org Chem 2012; 8:606-12. [PMID: 22563358 PMCID: PMC3343286 DOI: 10.3762/bjoc.8.67] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Accepted: 03/29/2012] [Indexed: 11/27/2022] Open
Abstract
An aryl substrate with dual functionality consisting of a nitrile oxide and a pinacolyl boronate ester was prepared by mild hypervalent iodine oxidation (diacetoxyiodobenzene) of the corresponding aldoxime, without decomposition of the boronate functionality. The nitrile oxide was trapped in situ with a variety of dipolarophiles to yield aryl isoxazolines with the boronate ester function intact and available for subsequent reaction.
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Affiliation(s)
- Sarah L Harding
- CSIRO Materials Science and Engineering, Private Bag 10, Clayton South MDC, Vic 3169, Australia
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35
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Solid Phase Synthesis of Isoxazole and Isoxazoline-carboxamides via [2+3]-Dipolar Cycloaddition Using Resin-bound Alkynes or Alkenes. Tetrahedron Lett 2012; 53:2096-2099. [PMID: 22715296 DOI: 10.1016/j.tetlet.2012.02.041] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
An efficient approach for the parallel solid phase synthesis of isoxazole and isoxazoline derivatives has been developed. The isoxazoles and isoxazolines were constructed through a 1,3-dipolar cycloaddition reaction of nitrile oxides, with resin-bound alkynes or alkenes. The cycloaddition reaction conditions performed on solid phase supports was optimized, and an array of resin bound carboxylic acid building blocks were utilized for distinct conversions. This methodology presents a new alternative to the diversity oriented synthesis of disubstituted isoxazoles and isoxazolines different from existing routes which are limited in structural diversity.
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36
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Badenock JC. Metalation Reactions of Isoxazoles and Benzisoxazoles. TOPICS IN HETEROCYCLIC CHEMISTRY 2012. [DOI: 10.1007/7081_2012_80] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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37
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Grob JE, Nunez J, Dechantsreiter MA, Hamann LG. Regioselective Synthesis and Slow-Release Suzuki–Miyaura Cross-Coupling of MIDA Boronate-Functionalized Isoxazoles and Triazoles. J Org Chem 2011; 76:10241-8. [PMID: 22047083 DOI: 10.1021/jo201973t] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jonathan E. Grob
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
| | - Jill Nunez
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
| | - Michael A. Dechantsreiter
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
| | - Lawrence G. Hamann
- Novartis Institutes for BioMedical Research, Inc., 250 Massachusetts Avenue, Cambridge, Massachusetts
02139, United States
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38
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Gayon E, Quinonero O, Lemouzy S, Vrancken E, Campagne JM. Transition-Metal-Catalyzed Uninterrupted Four-Step Sequence to Access Trisubstituted Isoxazoles. Org Lett 2011; 13:6418-21. [DOI: 10.1021/ol202719n] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Eric Gayon
- Institut Charles Gerhardt UMR 5253 CNRS-UM2-UM1-ENSCM, 8 rue de l’Ecole Normale, 34296 Montpellier Cedex 5, France
| | - Ophélie Quinonero
- Institut Charles Gerhardt UMR 5253 CNRS-UM2-UM1-ENSCM, 8 rue de l’Ecole Normale, 34296 Montpellier Cedex 5, France
| | - Sébastien Lemouzy
- Institut Charles Gerhardt UMR 5253 CNRS-UM2-UM1-ENSCM, 8 rue de l’Ecole Normale, 34296 Montpellier Cedex 5, France
| | - Emmanuel Vrancken
- Institut Charles Gerhardt UMR 5253 CNRS-UM2-UM1-ENSCM, 8 rue de l’Ecole Normale, 34296 Montpellier Cedex 5, France
| | - Jean-Marc Campagne
- Institut Charles Gerhardt UMR 5253 CNRS-UM2-UM1-ENSCM, 8 rue de l’Ecole Normale, 34296 Montpellier Cedex 5, France
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39
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Dadiboyena S, Nefzi A. Synthesis of functionalized tetrasubstituted pyrazolyl heterocycles – A review. Eur J Med Chem 2011; 46:5258-75. [DOI: 10.1016/j.ejmech.2011.09.016] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Revised: 08/21/2011] [Accepted: 09/12/2011] [Indexed: 10/17/2022]
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40
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Jackowski O, Lecourt T, Micouin L. Direct synthesis of polysubstituted aluminoisoxazoles and pyrazoles by a metalative cyclization. Org Lett 2011; 13:5664-7. [PMID: 21942717 DOI: 10.1021/ol202389u] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Alumino-heteroles are obtained from simple precursors in a fully chemo- and regioselective manner by a metalative cyclization. The carbon-aluminum bond is still able to react further with several electrophiles, without the need of transmetalation. This synthetic route provides a novel entry to heterocyclic organoaluminum reagents as well as a straightforward access to 3,4,5-trisubstituted isoxazoles and 1,3,4,5-tetrasubstituted pyrazoles.
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Affiliation(s)
- Olivier Jackowski
- UMR8638, CNRS-Paris Descartes University, Faculté de Pharmacie, 4 av. de l'Observatoire, 75006 Paris, France
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41
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Identification of 4H,6H-[2]benzoxepino[4,5-c][1,2]oxazoles as novel squalene synthase inhibitors. Bioorg Med Chem Lett 2011; 21:3648-53. [DOI: 10.1016/j.bmcl.2011.04.092] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2011] [Revised: 04/18/2011] [Accepted: 04/20/2011] [Indexed: 11/21/2022]
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42
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Dadiboyena S, Hamme AT. One Pot Spiropyrazoline Synthesis via Intramolecular Cyclization/Methylation. Tetrahedron Lett 2011; 52:2536-2539. [PMID: 21686095 PMCID: PMC3115653 DOI: 10.1016/j.tetlet.2011.03.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Regioisomeric spiropyrazolines were synthesized through a tandem intramolecular cyclization/methylation reaction of a functionalized 5,5-disubstituted pyrazoline in one reaction vessel. The 5,5-pyrazolines were constructed through a 1,3-dipolar cycloaddition reaction of aromatic ring containing nitrile imines and a disubstituted geminal alkene. An evaluation of the relative location of the nucleophilic and electrophilic functional groups on the pyrazoline was performed in order to ascertain the best pyrazoline system for the intramolecular cyclization/methylation reaction. Higher spiropyrazoline isolated yields were realized from pyrazolines with the electrophilic ester located further away from the pyrazoline when compared to pyrazolines with a directly bonded ester.
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Affiliation(s)
| | - Ashton T. Hamme
- Department of Chemistry & Biochemistry, College of Science, Engineering and Technology, Jackson State University, Jackson, Mississippi 39217 USA
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43
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Auvinet A, Harrity JPA. A Nickel‐Catalyzed Benzannulation Approach to Aromatic Boronic Esters. Angew Chem Int Ed Engl 2011; 50:2769-72. [DOI: 10.1002/anie.201007598] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2010] [Indexed: 11/12/2022]
Affiliation(s)
- Anne‐Laure Auvinet
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF (UK), Fax: (+44) 114‐222‐9346
| | - Joseph P. A. Harrity
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF (UK), Fax: (+44) 114‐222‐9346
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44
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Auvinet A, Harrity JPA. A Nickel‐Catalyzed Benzannulation Approach to Aromatic Boronic Esters. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201007598] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Anne‐Laure Auvinet
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF (UK), Fax: (+44) 114‐222‐9346
| | - Joseph P. A. Harrity
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF (UK), Fax: (+44) 114‐222‐9346
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45
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Khalafy J, Marjani AP, Rostamzadeh A. Synthesis of methyl 5-amino-3-arylaminoisoxazole-4-carboxylates. HETEROCYCL COMMUN 2011. [DOI: 10.1515/hc.2011.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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46
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Dadiboyena S, Nefzi A. Recent methodologies toward the synthesis of valdecoxib: a potential 3,4-diarylisoxazolyl COX-II inhibitor. Eur J Med Chem 2010; 45:4697-707. [PMID: 20724040 PMCID: PMC3263766 DOI: 10.1016/j.ejmech.2010.07.045] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Revised: 06/22/2010] [Accepted: 07/27/2010] [Indexed: 02/02/2023]
Abstract
Non-steroidal anti-inflammatory drugs are widely used therapeutic agents in the treatment of inflammation, pain and fever. Cyclooxygenase catalyzes the initial step of biotransformation of arachidonic acid to prostanoids, and exist as three distinct isozymes; COX-I, COX-II and COX-III. Selective COX-II inhibitors are a class of potential anti-inflammatory, analgesic, and antipyretic drugs with reduced gastrointestinal (GI) side effects compared to nonselective inhibitors. 3,4-Diarylisoxazole scaffold is recurrently found in a wide variety of NSAIDs, protein kinase inhibitors, hypertensive agents, and estrogen receptor (ER) modulators. In the present review, we document on the recent synthetic strategies of 3,4-diarylisoxazolyl scaffolds of valdecoxib and its relevant structural analogues.
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Affiliation(s)
| | - Adel Nefzi
- Torrey Pines Institute for Molecular Studies, Port St. Lucie FL 34987 USA
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47
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Huang J, Macdonald SJF, Harrity JPA. A borylative cyclisation towards indole boronic esters. Chem Commun (Camb) 2010; 46:8770-2. [PMID: 20963222 DOI: 10.1039/c0cc03577g] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
2-Alkynylaniline borylative cyclisations provide a direct means to access indole 3-boronic esters from simple precursors. The Pd-catalysed cyclisation can be merged with cross-coupling processes in the same reaction vessel, moreover, the products can be exploited in C-N bond forming reactions.
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Affiliation(s)
- Jianhui Huang
- Department of Chemistry, University of Sheffield, Sheffield, S3 7HF, UK
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48
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Primas N, Bouillon A, Rault S. Recent progress in the synthesis of five-membered heterocycle boronic acids and esters. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.08.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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49
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Crossley JA, Browne DL. An Alkynyliodide Cycloaddition Strategy for the Construction of Iodoisoxazoles. J Org Chem 2010; 75:5414-6. [DOI: 10.1021/jo1011174] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- James A. Crossley
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K
| | - Duncan L. Browne
- Department of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K
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50
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Ueda M, Sato A, Ikeda Y, Miyoshi T, Naito T, Miyata O. Direct Synthesis of Trisubstituted Isoxazoles through Gold-Catalyzed Domino Reaction of Alkynyl Oxime Ethers. Org Lett 2010; 12:2594-7. [DOI: 10.1021/ol100803e] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masafumi Ueda
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Aoi Sato
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Yuki Ikeda
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Tetsuya Miyoshi
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Takeaki Naito
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
| | - Okiko Miyata
- Kobe Pharmaceutical University, Motoyamakita, Higashinada, Kobe 658-8558, Japan
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