1
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Ferron S, Jéhan P, Guillory X, Uriac P. Intramolecular transesterification of depsides yields fluorescent 1H-isochromen-1-ones: Application as a chemical probe for lichen determination. PHYTOCHEMISTRY 2022; 198:113139. [PMID: 35276218 DOI: 10.1016/j.phytochem.2022.113139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 02/18/2022] [Accepted: 02/19/2022] [Indexed: 06/14/2023]
Abstract
The reactivity of eight purified depsides obtained from six european lichens and that display as 2-oxoalkyl chain in ortho-position of the ester bond was explored. These depsides were found to lead to 1H-Isochromen-1-ones, which exhibit a distinctive blue fluorescence at 365 nm, in the presence of a 10% aqueous solution of KOH. A mechanistic explanation, involving the formation of an enolate intermediate and intramolecular transesterification, was proposed and validated by DFT. By exploiting this fluorescent phenomenon, we conceived a chemical probe (the KUV probe) that is useful for lichen determination, as exemplified on a selection of European Porpidia species.
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Affiliation(s)
- S Ferron
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, COrInt, F-35000, Rennes, France
| | - P Jéhan
- Univ Rennes, CNRS, ScanMat - UMS 2001, CRMPO (Centre Régional de Mesures Physiques de l'Ouest, F-35000, Rennes, France
| | - X Guillory
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, COrInt, F-35000, Rennes, France; INSERM U1242, Univ Rennes, France
| | - P Uriac
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes), UMR 6226, COrInt, F-35000, Rennes, France.
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2
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Mies T, White AJP, Parsons PJ, Barrett AGM. Photolytic Studies on the Generation and Trapping of 6‐Oxomethylidenecyclohexa‐2,4‐diene‐1‐one Derivatives with Various Nucleophiles. Helv Chim Acta 2021. [DOI: 10.1002/hlca.202100189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Thomas Mies
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane UK-London W12 0BZ England
| | - Andrew J. P. White
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane UK-London W12 0BZ England
| | - Philip J. Parsons
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane UK-London W12 0BZ England
| | - Anthony G. M. Barrett
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane UK-London W12 0BZ England
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3
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Narita K, Kimura R, Satoh H, Watanabe K, Yoshimura Y. Concise Syntheses of Violaceoids A and C. Chem Pharm Bull (Tokyo) 2021; 69:232-235. [PMID: 33239487 DOI: 10.1248/cpb.c20-00816] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The concise syntheses of two alkylated hydroquinone natural products, violaceoids A and C, were accomplished by a protecting-group-free method employing the commercially available 2,5-dihydroxybenzaldehyde as the starting material. The key strategy of the syntheses is the utilization of alkenylboronic acid as both the coupling and temporary protective reagents to efficiently introduce the requisite alkenyl side chain of violaceoid A. Moreover, the synthesis of violaceoid C is reported here for the first time.
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Affiliation(s)
- Koichi Narita
- Laboratory of Synthetic and Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University
| | - Ryuhei Kimura
- Laboratory of Synthetic and Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University
| | - Hiroka Satoh
- Laboratory of Synthetic and Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University
| | - Kazuhiro Watanabe
- Laboratory of Synthetic and Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University
| | - Yuichi Yoshimura
- Laboratory of Synthetic and Medicinal Chemistry, Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University.,Laboratory of Organic and Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University
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4
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A convergent approach toward fidaxomicin: Syntheses of the fully glycosylated northern and southern fragments. Tetrahedron 2020; 79. [PMID: 33191957 DOI: 10.1016/j.tet.2020.131673] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Efficient approaches that enable the synthesis of analogs of natural product antibiotics are needed to keep up with the emergence of multiply-resistant strains of pathogenic organisms. One promising candidate in this area is fidaxomicin, which boasts impressive in vitro anti-tubercular activity but has poor systemic bioavailability. We designed a flexible synthetic route to this target to enable the exploration of new chemical space and the future development of analogs with superior pharmacokinetics. We developed a robust approach to each of the key macrocyclic and sugar fragments, their union via stereoselective glycosylation, and a convergent late-stage macrolide formation with fully glycosylated fragments. Although we were able to demonstrate that the final Suzuki cross-coupling and ring-closing metathesis steps enabled macrocycle formation in the presence of the northern resorcylic rhamnoside and southern novioside sugars, these final steps were hampered by poor yields and the formation of the unwanted Z-macrocycle as the major stereoisomer.
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5
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The formal synthesis of (+)-15-deoxy-Δ12,14-prostaglandin J2 by utilizing SmI2-promoted intramolecular coupling of bromoalkynes and α,β-unsaturated esters. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131148] [Citation(s) in RCA: 2] [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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6
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Oleksak P, Gonda J, Nepovimova E, Kuca K, Musilek K. The oxazolomycin family: a review of current knowledge. RSC Adv 2020; 10:40745-40794. [PMID: 35519217 PMCID: PMC9057759 DOI: 10.1039/d0ra08396h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 10/25/2020] [Indexed: 12/19/2022] Open
Abstract
Oxazolomycin A and neooxazolomycin were firstly isolated in 1985 by the group of Uemura et al. from the Streptomyces sp. bacteria.
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Affiliation(s)
- Patrik Oleksak
- University of Hradec Kralove
- Faculty of Science
- Department of Chemistry
- Hradec Kralove
- Czech Republic
| | - Jozef Gonda
- Pavol Jozef Safarik University
- Faculty of Science
- Department of Organic Chemistry
- Kosice
- Slovak Republic
| | - Eugenie Nepovimova
- University of Hradec Kralove
- Faculty of Science
- Department of Chemistry
- Hradec Kralove
- Czech Republic
| | - Kamil Kuca
- University of Hradec Kralove
- Faculty of Science
- Department of Chemistry
- Hradec Kralove
- Czech Republic
| | - Kamil Musilek
- University of Hradec Kralove
- Faculty of Science
- Department of Chemistry
- Hradec Kralove
- Czech Republic
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7
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Eto K, Ishihara J, Hatakeyama S. Stereoselective synthesis of the right-hand cores of 16-methylated oxazolomycins. Tetrahedron 2018. [DOI: 10.1016/j.tet.2017.12.036] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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8
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Bender CF, Paradise CL, Lynch VM, Yoshimoto FK, De Brabander JK. A biosynthetically inspired synthesis of (-)-berkelic acid and analogs. Tetrahedron 2018; 74:909-919. [PMID: 29867257 DOI: 10.1016/j.tet.2018.01.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We describe a complete account of our total synthesis and biological evaluation of (-)-berkelic acid and analogs. We delineate a synthetic strategy inspired by a potentially biomimetic union between the natural products spicifernin and pulvilloric acid. After defining optimal parameters, we executed a one-pot silver-mediated in situ dehydration of an isochroman lactol to methyl pulvillorate, the cycloisomerization of a spicifernin-like alkynol to the corresponding exocyclic enol ether, and a subsequent cycloaddition to deliver the tetracyclic core of berkelic acid. Our studies confirm that the original assigned berkelic acid structure is not stable and equilibrates into a mixture of 4 diastereomers, fully characterized by X-ray crystallography. In addition to berkelic acid, C22-epi-berkelic acid, and nor-berkelic acids, we synthesized C26-oxoberkelic acid analogs that were evaluated against human cancer cell lines. In contrast to data reported for natural berkelic acid, our synthetic material and analogs were found to be devoid of activity.
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Affiliation(s)
- Christopher F Bender
- Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9038, USA
| | - Christopher L Paradise
- Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9038, USA
| | - Vincent M Lynch
- Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, Texas 78712, USA
| | - Francis K Yoshimoto
- Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9038, USA
| | - Jef K De Brabander
- Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75390-9038, USA
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9
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Arslan M, Motallebzadeh A, Kiskan B, Demirel AL, Kumbaraci IV, Yagci Y. Combining benzoxazine and ketene chemistries for self-healing of high performance thermoset surfaces. Polym Chem 2018. [DOI: 10.1039/c8py00293b] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The use of oxoketene chemistry for self-healable polybenzoxazines is described.
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Affiliation(s)
- Mustafa Arslan
- Istanbul Technical University
- Department of Chemistry
- Istanbul
- Turkey
| | - Amir Motallebzadeh
- Koc University Surface Science and Technology Centre (KUYTAM)
- Istanbul
- Turkey
| | - Baris Kiskan
- Istanbul Technical University
- Department of Chemistry
- Istanbul
- Turkey
| | | | | | - Yusuf Yagci
- Istanbul Technical University
- Department of Chemistry
- Istanbul
- Turkey
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10
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Ghanty S, Khan PR, Reddy BVS. Stereoselective Total Syntheses of (3 R,5 R)-Sonnerlactone and (3 R,5 S)-Sonnerlactone. Nat Prod Commun 2017. [DOI: 10.1177/1934578x1701200925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A highly convergent and concise total syntheses of (3 R,5 R)-Sonnerlactone and (3 R,5 S) Sonnerlactone from a readily available L-malic acid is described. The following series of reactions such as Barbier allylation, photochemical esterification and Ring Closing Metathesis (RCM) are utilized as key steps to accomplish their syntheses.
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Affiliation(s)
- Supriya Ghanty
- Centre for Semiochemicals, Indian Institute of Chemical Technology, Hyderabad-500 007, India
| | - P. Rasvan Khan
- Centre for Semiochemicals, Indian Institute of Chemical Technology, Hyderabad-500 007, India
| | - B. V. Subba Reddy
- Centre for Semiochemicals, Indian Institute of Chemical Technology, Hyderabad-500 007, India
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11
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Carrillo-Arcos UA, Rojas-Ocampo J, Porcel S. Oxidative cyclization of alkenoic acids promoted by AgOAc. Dalton Trans 2016; 45:479-83. [PMID: 26646812 DOI: 10.1039/c5dt03808a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Alkenoic acids derived from salicylic acid and analogues undergo an unexpected oxidative cyclization process triggered by AgOAc leading to 4H-benzo[d][1,3]dioxin-4-ones. The process is affected by the substitution on the aryl and the allyl units.
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Affiliation(s)
- Ulises A Carrillo-Arcos
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, 04510 México D.F., México.
| | - Jonathan Rojas-Ocampo
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, 04510 México D.F., México.
| | - Susana Porcel
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, 04510 México D.F., México.
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12
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Gündüz H, Kumbaraci V, Talinli N. Reactions of Quino-Ketenes with C-Nucleophiles: Syntheses of (2-Hydroxyphenyl)methanols and 2-Hydroxyphenyl Ketones. Helv Chim Acta 2014. [DOI: 10.1002/hlca.201300391] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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13
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Ishihara J, Hatakeyama S. Total Synthesis of Oxazolomycins. CHEM REC 2014; 14:663-77. [DOI: 10.1002/tcr.201402009] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Indexed: 01/22/2023]
Affiliation(s)
- Jun Ishihara
- Graduate School of Biomedical Sciences; Nagasaki University; Nagasaki 852-8521 Japan
| | - Susumi Hatakeyama
- Graduate School of Biomedical Sciences; Nagasaki University; Nagasaki 852-8521 Japan
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14
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Lin F, Song Q, Gao Y, Cui X. A catalyst-free, facile and efficient approach to cyclic esters: synthesis of 4H-benzo[d][1,3]dioxin-4-ones. RSC Adv 2014. [DOI: 10.1039/c4ra01651c] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A metal and additive free base-mediated method for the formation of 4H-benzo[d][1,3]dioxin-4-one and its derivatives, from salicylic acids and dichloromethane, was developed using dichloromethane (DCM) and 1,1-dichloroethane (1,1-DCE) as the C1 source.
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Affiliation(s)
- Feng Lin
- Engineering Research Center of Molecular Medicine
- Ministry of Education
- Key Laboratory of Xiamen Marine and Gene Drugs
- Institutes of Molecular Medicine and School of Biomedical Sciences
- Huaqiao University
| | - Qiuling Song
- Engineering Research Center of Molecular Medicine
- Ministry of Education
- Key Laboratory of Xiamen Marine and Gene Drugs
- Institutes of Molecular Medicine and School of Biomedical Sciences
- Huaqiao University
| | - Yuyu Gao
- Engineering Research Center of Molecular Medicine
- Ministry of Education
- Key Laboratory of Xiamen Marine and Gene Drugs
- Institutes of Molecular Medicine and School of Biomedical Sciences
- Huaqiao University
| | - Xiuling Cui
- Engineering Research Center of Molecular Medicine
- Ministry of Education
- Key Laboratory of Xiamen Marine and Gene Drugs
- Institutes of Molecular Medicine and School of Biomedical Sciences
- Huaqiao University
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15
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He Y, Zhang X, Shen N, Fan X. Tunable Synthesis of 3-Acyl-2-naphthols and 3-Substituted Isocoumarins via Jones Reagent Promoted Cascade Reactions of 2-(4-Hydroxy-but-1-ynyl)benzaldehydes. J Org Chem 2013; 78:10178-91. [DOI: 10.1021/jo401502k] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Yan He
- School of Environment,
Key Laboratory for Yellow River and Huai River Water Environment and
Pollution Control, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China
- School of Chemistry
and Chemical Engineering, Key Laboratory of Green Chemical Media and
Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China
| | - Xinying Zhang
- School of Chemistry
and Chemical Engineering, Key Laboratory of Green Chemical Media and
Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China
| | - Nana Shen
- School of Chemistry
and Chemical Engineering, Key Laboratory of Green Chemical Media and
Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China
| | - Xuesen Fan
- School of Environment,
Key Laboratory for Yellow River and Huai River Water Environment and
Pollution Control, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China
- School of Chemistry
and Chemical Engineering, Key Laboratory of Green Chemical Media and
Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, PR China
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16
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Halocyclization of Methyl 2-Alkynylbenzoates to Isocoumarins Using Cupric Halides. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200800095] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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17
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Fan X, He Y, Cui L, Guo S, Wang J, Zhang X. Tandem Reactions Leading to Benzo[c]chromen-6-ones and 3-Substituted Isocoumarins. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101559] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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18
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Eto K, Yoshino M, Takahashi K, Ishihara J, Hatakeyama S. Total Synthesis of Oxazolomycin A. Org Lett 2011; 13:5398-401. [DOI: 10.1021/ol202306d] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kohei Eto
- Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki 852-8521, Japan
| | - Madoka Yoshino
- Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki 852-8521, Japan
| | - Keisuke Takahashi
- Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki 852-8521, Japan
| | - Jun Ishihara
- Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki 852-8521, Japan
| | - Susumi Hatakeyama
- Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki 852-8521, Japan
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19
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Affiliation(s)
- Jacques Muzart
- Institut de Chimie Moléculaire de Reims, UMR 6229, CNRS – Université de Reims Champagne‐Ardenne, B. P. 1039, 51687 Reims Cedex 2, France
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20
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21
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Darses S, Genet JP. Potassium Organotrifluoroborates: New Perspectives in Organic Synthesis. Chem Rev 2007; 108:288-325. [PMID: 18095714 DOI: 10.1021/cr0509758] [Citation(s) in RCA: 582] [Impact Index Per Article: 34.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sylvain Darses
- Laboratoire de Synthèse Sélective Organique et Produits Naturels (UMR 7573, CNRS), Ecole Nationale Supérieure de Chimie de Paris, 11 rue P&M Curie, 75231 Paris Cedex 05, France
| | - Jean-Pierre Genet
- Laboratoire de Synthèse Sélective Organique et Produits Naturels (UMR 7573, CNRS), Ecole Nationale Supérieure de Chimie de Paris, 11 rue P&M Curie, 75231 Paris Cedex 05, France
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22
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Molander GA, Fumagalli T. Palladium(0)-catalyzed suzuki-miyaura cross-coupling reactions of potassium aryl- and heteroaryltrifluoroborates with alkenyl bromides. J Org Chem 2007; 71:5743-7. [PMID: 16839157 DOI: 10.1021/jo0608366] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Efficient palladium(0)-catalyzed Suzuki-Miyaura cross-couplings are described. The reactions involving potassium aryl- and heteroaryltrifluoroborates with alkenyl bromides can generally be carried out using < or =2 mol % of palladium catalyst and 3 equiv of base in toluene/H2O. When stereodefined alkenyl bromides are employed, the resulting styrene derivatives are accessed stereospecifically. A variety of functional groups are tolerated in both coupling partners.
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Affiliation(s)
- Gary A Molander
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.
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23
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Molander GA, Ellis N. Organotrifluoroborates: protected boronic acids that expand the versatility of the Suzuki coupling reaction. Acc Chem Res 2007; 40:275-86. [PMID: 17256882 DOI: 10.1021/ar050199q] [Citation(s) in RCA: 762] [Impact Index Per Article: 44.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Organotrifluoroborates represent an alternative to boronic acids, boronate esters, and organoboranes for use in Suzuki-Miyaura and other transition-metal-catalyzed cross-coupling reactions. The trifluoroborate moiety is stable toward numerous reagents that are often problematic for other boron species. Consequently, remote functional groups within the organotrifluoroborates can be manipulated, while retaining the valuable carbon-boron bond.
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Affiliation(s)
- Gary A Molander
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, Pennsylvania 19104-6323, USA
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24
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Molander GA, Ham J. Synthesis of functionalized organotrifluoroborates via the 1,3-dipolar cycloaddition of azides. Org Lett 2006; 8:2767-70. [PMID: 16774252 PMCID: PMC2515368 DOI: 10.1021/ol060826r] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text] We have successfully prepared potassium azidoalkyltrifluoroborates from the corresponding halogen compounds in 94-98% yields through a nucleophilic substitution reaction with NaN(3). In the presence of various alkynes and Cu(I) as a catalyst, these azidotrifluoroborates easily formed 1,4-disubstituted organo-[1,2,3]-triazol-1-yl-trifluoroborates in 85-98% yields. This method was then developed into a facile one-pot synthesis for the preparation of various organo-[1,2,3]-triazol-1-yl-trifluoroborates using haloalkyltrifluoroborates as the starting materials.
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Affiliation(s)
- Gary A Molander
- Roy and Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania, Philadelphia, 19104-6323, USA.
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25
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Abstract
[structure: see text] We describe a highly convergent synthetic approach to the natural product (+)-SCH 351448 (1)-a hexane-soluble heptacoordinate monosodium salt of a C(2)-symmetrical macrocyclic dilactone. Our approach implements a photochemical acylation as the key step to combine two nearly identical but orthogonal C1-C29 fragments, followed by a base-induced intramolecular acylation and deprotection to yield the natural product.
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Affiliation(s)
- Omid Soltani
- Department of Biochemistry, The University of Texas Southwestern Medical Center at Dallas, 5323 Harry Hines Boulevard, Dallas, Texas 75390-9038, USA
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