1
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Elavarasan S, Preety J, Kesavan M, Patel RB, Baskar B. Activation of enamine by photoexcited organocatalyst assisted singlet oxygen: synthesis of oxazoles and quinoxalines. Org Biomol Chem 2024; 22:4912-4921. [PMID: 38808593 DOI: 10.1039/d4ob00609g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
Herein, a novel transition-metal-free thiol-based donor-acceptor organophotocatalyst-assisted, singlet-oxygen-mediated tandem oxidative cyclization for the synthesis of substituted oxazoles in moderate-to-good yields is described. The developed method demonstrates applicability for the synthesis of various substituted quinoxalines in good-to-excellent yields. The metal-free methodology shows a practical route for the synthesis of oxazole and quinoxaline derivatives, which are privileged moieties prevalent in various biologically active compounds and natural products. To the best of our knowledge, both the thiol photocatalyst and synthesis of oxazoles by visible-light irradiation are reported for the first time.
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Affiliation(s)
- Selvaraj Elavarasan
- Laboratory of Sustainable Synthesis, Department of Chemistry, SRM Institute of Science and Technology, Kattankulatur, 603 203, Chengalpet (Dt), Tamilnadu, India.
| | - Jeyaraj Preety
- Laboratory of Sustainable Synthesis, Department of Chemistry, SRM Institute of Science and Technology, Kattankulatur, 603 203, Chengalpet (Dt), Tamilnadu, India.
| | - M Kesavan
- Interdisciplinary Institute of Indian System of Medicine (IIISM), SRM Institute of Science and Technology, Kattankulatur, 603 203, Chengalpet (Dt), Tamilnadu, India
| | - Ravi B Patel
- Graduate School of Pharmacy, Gujarat Technological University, Ghandhinagar Campus, Ghandhinagar - 382028, Gujarat, India
| | - Baburaj Baskar
- Laboratory of Sustainable Synthesis, Department of Chemistry, SRM Institute of Science and Technology, Kattankulatur, 603 203, Chengalpet (Dt), Tamilnadu, India.
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2
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Ye X, Pan H, Huang Y, Chen J, Wang Z. Photochemical three-component assembly of tri-substituted oxazoles through a carbenic phosphorus-nitrile hybrid ylide formation/trapping cascade. Chem Sci 2024; 15:6515-6521. [PMID: 38699275 PMCID: PMC11062088 DOI: 10.1039/d4sc01355g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2024] [Accepted: 03/06/2024] [Indexed: 05/05/2024] Open
Abstract
Construction of complex molecular skeletons with ubiquitous chemical feedstocks in a single transformation is highly appealing in organic synthesis. We report a novel visible-light-induced three-component reaction for the construction of complex 2,4,5-trisubstituted oxazoles, which are valuable in medicinal chemistry, from simple and readily available iodonium-phosphonium hybrid ylides, carboxylic acids, and nitriles. This reaction features a carbenic phosphorus-nitrile hybrid ylide formation/trapping cascade, in which a photo-generated α-phosphonium carbene acts as a sequence trigger. This catalyst- and additive-free transformation exhibits high efficiency and broad substrate scope for synthesizing diverse oxazoles.
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Affiliation(s)
- Xingchen Ye
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University Changsha Hunan 410082 P. R. China
| | - Huaijin Pan
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University Changsha Hunan 410082 P. R. China
| | - Yong Huang
- Department of Chemistry, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong SAR P. R. China
| | - Jiean Chen
- Pingshan Translational Medicine Center, Shenzhen Bay Laboratory Shenzhen 518118 P. R. China
| | - Zhaofeng Wang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University Changsha Hunan 410082 P. R. China
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3
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Kumar S, Arora A, Sapra S, Kumar R, Singh BK, Singh SK. Recent advances in the synthesis and utility of thiazoline and its derivatives. RSC Adv 2024; 14:902-953. [PMID: 38174252 PMCID: PMC10759189 DOI: 10.1039/d3ra06444a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2023] [Accepted: 12/18/2023] [Indexed: 01/05/2024] Open
Abstract
Thiazolines and their derivatives hold significant importance in the field of medicinal chemistry due to their promising potential as pharmaceutical agents. These molecular entities serve as critical scaffolds within numerous natural products, including curacin A, thiangazole, and mirabazole, and play a vital role in a wide array of physiological reactions. Their pharmacological versatility encompasses anti-HIV, neurological, anti-cancer, and antibiotic activities. Over the course of recent decades, researchers have extensively explored and developed analogs of these compounds, uncovering compelling therapeutic properties such as antioxidant, anti-tumor, anti-microbial, and anti-inflammatory effects. Consequently, thiazoline-based compounds have emerged as noteworthy targets for synthetic endeavors. In this review, we provide a comprehensive summary of recent advancements in the synthesis of thiazolines and thiazoline-based derivatives, along with an exploration of their diverse potential applications across various scientific domains.
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Affiliation(s)
- Sumit Kumar
- Bioorganic Laboratory, Department of Chemistry, University of Delhi Delhi-110007 India
| | - Aditi Arora
- Bioorganic Laboratory, Department of Chemistry, University of Delhi Delhi-110007 India
| | - Shivani Sapra
- Bioorganic Laboratory, Department of Chemistry, University of Delhi Delhi-110007 India
| | - Rajesh Kumar
- Department of Chemistry, R. D. S College, B. R. A. Bihar University Muzaffarpur 842002 India
| | - Brajendra K Singh
- Bioorganic Laboratory, Department of Chemistry, University of Delhi Delhi-110007 India
| | - Sunil K Singh
- Department of Chemistry, Kirori Mal College, University of Delhi Delhi-110007 India
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4
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de la Fuente MC, Ageitos L, Lages MA, Martínez-Matamoros D, Forero AM, Balado M, Lemos ML, Rodríguez J, Jiménez C. Structural Requirements for Ga 3+ Coordination in Synthetic Analogues of the Siderophore Piscibactin Deduced by Chemical Synthesis and Density Functional Theory Calculations. Inorg Chem 2023; 62:7503-7514. [PMID: 37140938 DOI: 10.1021/acs.inorgchem.3c00787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Stereoselective total synthesis of several analogues of piscibactin (Pcb), the siderophore produced by different pathogenic Gram-negative bacteria, was performed. The acid-sensitive α-methylthiazoline moiety was replaced by a more stable thiazole ring, differing in the configuration of the OH group at the C-13 position. The ability of these Pcb analogues to form complexes with Ga3+ as a mimic of Fe3+ showed that the configuration of the hydroxyl group at C-13 as 13S is crucial for the chelation of Ga3+ to preserve the metal coordination, while the presence of a thiazole ring instead of the α-methylthiazoline moiety does not affect such coordination. A complete 1H and 13C NMR chemical shift assignment of the diastereoisomer mixtures around C9/C10 was done for diagnostic stereochemical disposition. Additionally, density functional theory calculations were performed not only for confirming the stereochemistry of the Ga3+ complex among the six possible diastereoisomers but also for deducing the ability of these to form octahedral coordination spheres with gallium. Finally, the lack of antimicrobial activity of Pcb and Pcb thiazole analogue Ga3+ complexes against Vibrio anguillarum agrees with one of the roles of siderophores in protecting pathogens from metal ion toxicity. The efficient metal coordination shown by this scaffold suggests its possible use as a starting point for the design of new chelating agents or vectors for the development of new antibacterials that exploit the "Trojan horse" strategy using the microbial iron uptake mechanisms. The results obtained will be of great help in the development of biotechnological applications for these types of compounds.
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Affiliation(s)
- M Carmen de la Fuente
- CICA─Centro Interdisciplinar de Química e Bioloxía, Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña 15071, Spain
| | - Lucía Ageitos
- CICA─Centro Interdisciplinar de Química e Bioloxía, Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña 15071, Spain
| | - Marta A Lages
- Departamento de Microbiología y Parasitología, Instituto de Acuicultura, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Spain
| | - Diana Martínez-Matamoros
- CICA─Centro Interdisciplinar de Química e Bioloxía, Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña 15071, Spain
| | - Abel M Forero
- CICA─Centro Interdisciplinar de Química e Bioloxía, Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña 15071, Spain
| | - Miguel Balado
- Departamento de Microbiología y Parasitología, Instituto de Acuicultura, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Spain
| | - Manuel L Lemos
- Departamento de Microbiología y Parasitología, Instituto de Acuicultura, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Spain
| | - Jaime Rodríguez
- CICA─Centro Interdisciplinar de Química e Bioloxía, Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña 15071, Spain
| | - Carlos Jiménez
- CICA─Centro Interdisciplinar de Química e Bioloxía, Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña 15071, Spain
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5
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Cheng X, Li L, Shan S, Pang S, Qu Y, Lu Y. Photooxidative Coupling of Thiols Promoted by Bromo(trichloro)methane in a Basic Aqueous Medium. Synlett 2023. [DOI: 10.1055/s-0042-1752654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
AbstractA transition-metal- and organic-solvent-free oxidative coupling of thiols catalyzed by BrCCl3 and NaOH in an aqueous medium with oxygen as a green oxidant was established The facile and green method has a broad substrate scope in converting thiols into the corresponding disulfides with medium to excellent yields (up to 91%). This method could potentially be used to construct bioactive molecules containing disulfide bonds and to label bioactive molecules with disulfide bonds.
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6
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Woods JE, Jourdain RM, Romo D. Synthesis and Stability Studies of a Simplified, Thiazole-Containing Macrocycle of the Anticancer Agent Salarin C. Org Lett 2022; 24:6891-6896. [PMID: 35975906 PMCID: PMC9746118 DOI: 10.1021/acs.orglett.2c02326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
While salarin C (SalaC) is a potent marine cytotoxin, Kashman demonstrated that congeners which had undergone Wasserman rearrangement exhibit little to no cytotoxicity. Given that thiazoles are known to undergo Wasserman rearrangement at a significantly reduced rate, we hypothesized that a thiazole-containing SalaC would exhibit greater stability without significantly altering the macrocyclic conformation. Herein, we describe the synthesis of a simplified, thiazole-containing macrocycle which demonstrates significantly improved stability under identical aerobic conditions.
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7
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Savva L, Fossépré M, Keramidas O, Themistokleous A, Rizeq N, Panagiotou N, Leclercq M, Nicolaidou E, Surin M, Hayes SC, Georgiades SN. Gaining Insights on the Interactions of a Class of Decorated (2-([2,2'-Bipyridin]-6-yl)phenyl)platinum Compounds with c-Myc Oncogene Promoter G-Quadruplex and Other DNA Structures. Chemistry 2022; 28:e202201497. [PMID: 35726630 PMCID: PMC9804160 DOI: 10.1002/chem.202201497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2022] [Indexed: 01/05/2023]
Abstract
Organometallic molecules offer some of the most promising scaffolds for interaction with G-quadruplex nucleic acids. We report the efficient synthesis of a family of organoplatinum(II) complexes, featuring a 2-([2,2'-bipyridin]-6-yl)phenyl tridentate (N∧ N∧ C) ligand, that incorporates peripheral side-chains aiming at enhancing and diversifying its interaction capabilities. These include a di-isopropyl carbamoyl amide, a morpholine ethylenamide, two enantiomeric proline imides and an oxazole. The binding affinities of the Pt-complexes were evaluated via UV-vis and fluorescence titrations, against 5 topologically-distinct DNA structures, including c-myc G-quadruplex, two telomeric (22AG) G-quadruplexes, a duplex (ds26) and a single-stranded (polyT) DNA. All compounds exhibited binding selectivity in favour of c-myc, with association constants (Ka ) in the range of 2-5×105 M-1 , lower affinity for both folds of 22AG and for ds26 and negligible affinity for polyT. Remarkable emission enhancements (up to 200-fold) upon addition of excess DNA were demonstrated by a subset of the compounds with c-myc, providing a basis for optical selectivity, since optical response to all other tested DNAs was low. A c-myc DNA-melting experiment showed significant stabilizing abilities for all compounds, with the most potent binder, the morpholine-Pt-complex, exhibiting a ΔTm >30 °C, at 1 : 5 DNA-to-ligand molar ratio. The same study implied contributions of the diverse side-chains to helix stabilization. To gain direct evidence of the nature of the interactions, mixtures of c-myc with the four most promising compounds were studied via UV Resonance Raman (UVRR) spectroscopy, which revealed end-stacking binding mode, combined with interactions of side-chains with loop nucleobase residues. Docking simulations were conducted to provide insights into the binding modes for the same four Pt-compounds, suggesting that the binding preference for two alternative orientations of the c-myc G-quadruplex thymine 'cap' ('open' vs. 'closed'), as well as the relative contributions to affinity from end-stacking and H-bonding, are highly dependent on the nature of the interacting Pt-complex side-chain.
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Affiliation(s)
- Loukiani Savva
- Department of ChemistryUniversity of Cyprus1 Panepistimiou Avenue, Aglandjia2109NicosiaCyprus
| | - Mathieu Fossépré
- Laboratory for Chemistry of Novel MaterialsUniversity of Mons – UMONS20 Place du ParcB-7000MonsBelgium
| | - Odysseas Keramidas
- Department of ChemistryUniversity of Cyprus1 Panepistimiou Avenue, Aglandjia2109NicosiaCyprus
| | | | - Natalia Rizeq
- Department of ChemistryUniversity of Cyprus1 Panepistimiou Avenue, Aglandjia2109NicosiaCyprus
| | - Nikos Panagiotou
- Department of ChemistryUniversity of Cyprus1 Panepistimiou Avenue, Aglandjia2109NicosiaCyprus
| | - Maxime Leclercq
- Laboratory for Chemistry of Novel MaterialsUniversity of Mons – UMONS20 Place du ParcB-7000MonsBelgium
| | - Eliana Nicolaidou
- Department of ChemistryUniversity of Cyprus1 Panepistimiou Avenue, Aglandjia2109NicosiaCyprus
| | - Mathieu Surin
- Laboratory for Chemistry of Novel MaterialsUniversity of Mons – UMONS20 Place du ParcB-7000MonsBelgium
| | - Sophia C. Hayes
- Department of ChemistryUniversity of Cyprus1 Panepistimiou Avenue, Aglandjia2109NicosiaCyprus
| | - Savvas N. Georgiades
- Department of ChemistryUniversity of Cyprus1 Panepistimiou Avenue, Aglandjia2109NicosiaCyprus
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8
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Wang Y, Zhao X, Wu X, Zhang L, Li G, He Y. Electrochemical Synthesis of Trisubstituted Oxazoles and Imines from β‐Diketones and Amines. ChemElectroChem 2022. [DOI: 10.1002/celc.202200378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yangli Wang
- Key Laboratory of Chemistry in Ethnic Medicinal Resources State Ethnic Affairs Commission & Ministry of Education Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes State Ethnic Affairs Commission School of Ethnic Medicine Yunnan Minzu University Kunming 650500 China
| | - Xiao‐Jing Zhao
- Key Laboratory of Chemistry in Ethnic Medicinal Resources State Ethnic Affairs Commission & Ministry of Education Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes State Ethnic Affairs Commission School of Ethnic Medicine Yunnan Minzu University Kunming 650500 China
| | - Xi Wu
- Key Laboratory of Chemistry in Ethnic Medicinal Resources State Ethnic Affairs Commission & Ministry of Education Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes State Ethnic Affairs Commission School of Ethnic Medicine Yunnan Minzu University Kunming 650500 China
| | - Lizhu Zhang
- Key Laboratory of Chemistry in Ethnic Medicinal Resources State Ethnic Affairs Commission & Ministry of Education Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes State Ethnic Affairs Commission School of Ethnic Medicine Yunnan Minzu University Kunming 650500 China
| | - Ganpeng Li
- Key Laboratory of Chemistry in Ethnic Medicinal Resources State Ethnic Affairs Commission & Ministry of Education Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes State Ethnic Affairs Commission School of Ethnic Medicine Yunnan Minzu University Kunming 650500 China
| | - Yonghui He
- Key Laboratory of Chemistry in Ethnic Medicinal Resources State Ethnic Affairs Commission & Ministry of Education Key Laboratory of Natural Products Synthetic Biology of Ethnic Medicinal Endophytes State Ethnic Affairs Commission School of Ethnic Medicine Yunnan Minzu University Kunming 650500 China
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9
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Li X, Fan J, Cui D, Yan H, Shan S, Lu Y, Cheng X, Loh TP. Catalyst‐ and metal‐free photo‐oxidative coupling of thiols with BrCCl3. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Xiaoman Li
- Nanjing Tech University Institute of Advanced Synthesis CHINA
| | - Jiali Fan
- Nanjing Tech University Institute of Advanced Synthesis CHINA
| | - Dezhi Cui
- Nanjing Tech University Institute of Advanced Synthesis CHINA
| | - Hui Yan
- Nanjing Tech University Institute of Advanced Synthesis CHINA
| | - Shiquan Shan
- Nanjing Tech University Institute of Advanced Synthesis CHINA
| | - Yongna Lu
- Nanjing Tech University Institute of Advanced Synthesis CHINA
| | - Xiamin Cheng
- Nanjing Tech University Institute of Advanced Synthesis 30 South Puzhu Road 211816 Nanjing CHINA
| | - Teck-peng Loh
- Nanyang Technological University Division of Chemistry and Biological Chemistry SINGAPORE
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10
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Rodriguez del Rey FO, Floreancig PE. Synthesis of Nitrogen-Containing Heterocycles through Catalytic Dehydrative Cyclization Reactions. Org Lett 2020; 23:150-154. [DOI: 10.1021/acs.orglett.0c03868] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
| | - Paul E. Floreancig
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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11
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Wang Y, Zhang WX, Xi Z. Carbodiimide-based synthesis of N-heterocycles: moving from two classical reactive sites to chemical bond breaking/forming reaction. Chem Soc Rev 2020; 49:5810-5849. [PMID: 32658233 DOI: 10.1039/c9cs00478e] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Carbodiimides are a unique class of heterocumulene compounds that display distinctive chemical properties. The rich chemistry of carbodiimides has drawn increasing attention from chemists in recent years and has made them exceedingly useful compounds in modern organic chemistry, especially in the synthesis of N-heterocycles. This review has outlined the extensive application of carbodiimides in the synthesis of N-heterocycles from the 1980s to today. A wide range of reactions for the synthesis of various types of N-heterocyclic systems (three-, four-, five-, six-, seven-, larger-membered and fused heterocycles) have been developed on the basis of carbodiimides and their derivatives.
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Affiliation(s)
- Yang Wang
- Key Laboratory of Marine Drugs, Chinese Ministry of Education, School of Medicine and Pharmacy, Ocean University of China, 5 Yushan Road, Qingdao 266003, China. and Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology (QNLM), Qingdao 266237, China
| | - Wen-Xiong Zhang
- Beijing National Laboratory for Molecular Sciences, MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering, College of Chemistry, Peking University, Beijing 100871, China.
| | - Zhenfeng Xi
- Beijing National Laboratory for Molecular Sciences, MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering, College of Chemistry, Peking University, Beijing 100871, China.
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12
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Shingare RD, Aniebok V, Lee HW, MacMillan JB. Synthesis and Investigation of the Abiotic Formation of Pyonitrins A-D. Org Lett 2020; 22:1516-1519. [PMID: 32017580 PMCID: PMC7864527 DOI: 10.1021/acs.orglett.0c00098] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Pyonitrins
A–D are recently isolated natural products from
the insect-associated Pseudomonas protegens strain,
which were isolated from complex fractions that exhibited antifungal
activity via an in vivo murine candidiasis assay.
Genomic studies of Pseudomonas protegens suggested
that pyonitrins A–D are formed via a spontaneous nonenzymatic
reaction between biosynthetic intermediates of two well-known natural
products pyochelin and pyrrolnitrin. Herein we have accomplished the
first biomimetic total synthesis of pyonitrins A–D in three
steps and studied the nonenzymatic formation of the pyonitrins using 15N NMR spectroscopy.
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Affiliation(s)
- Rahul D Shingare
- Department of Chemistry and Biochemistry , University of California, Santa Cruz , Santa Cruz , California 95064 , United States
| | - Victor Aniebok
- Department of Chemistry and Biochemistry , University of California, Santa Cruz , Santa Cruz , California 95064 , United States
| | - Hsiau-Wei Lee
- Department of Chemistry and Biochemistry , University of California, Santa Cruz , Santa Cruz , California 95064 , United States
| | - John B MacMillan
- Department of Chemistry and Biochemistry , University of California, Santa Cruz , Santa Cruz , California 95064 , United States
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13
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Liu J, Dong Y, Li G, Min X, Hussain M. Unexpected intramolecular nucleophilic cyclization of ureidoacetamide: A novel route towards the synthesis of 2,4,5-trisubsituted oxazoles. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.05.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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14
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Solomin VV, Radchenko DS, Slobodyanyuk EY, Geraschenko OV, Vashchenko BV, Grygorenko OO. Widely Exploited, Yet Unreported: Regiocontrolled Synthesis and the Suzuki-Miyaura Reactions of Bromooxazole Building Blocks. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900032] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Vitalii V. Solomin
- Enamine Ltd. (www.enamine.net), Chervonotkatska Street 78, Kyiv 02094, Ukraine, Chervonotkatska Street 78, Kyiv; 02094 Ukraine
| | - Dmytro S. Radchenko
- Enamine Ltd. (www.enamine.net), Chervonotkatska Street 78, Kyiv 02094, Ukraine, Chervonotkatska Street 78, Kyiv; 02094 Ukraine
- Taras Shevchenko National University of Kyiv; Ukraine
| | - Evgeniy Y. Slobodyanyuk
- Enamine Ltd. (www.enamine.net), Chervonotkatska Street 78, Kyiv 02094, Ukraine, Chervonotkatska Street 78, Kyiv; 02094 Ukraine
- Institute of Organic Chemistry; National Academy of Sciences of Ukraine, Murmanska Street 5, Kyiv 02660; Ukraine
| | - Oleksandr V. Geraschenko
- Enamine Ltd. (www.enamine.net), Chervonotkatska Street 78, Kyiv 02094, Ukraine, Chervonotkatska Street 78, Kyiv; 02094 Ukraine
| | - Bohdan V. Vashchenko
- Enamine Ltd. (www.enamine.net), Chervonotkatska Street 78, Kyiv 02094, Ukraine, Chervonotkatska Street 78, Kyiv; 02094 Ukraine
- Taras Shevchenko National University of Kyiv; Ukraine
| | - Oleksandr O. Grygorenko
- Enamine Ltd. (www.enamine.net), Chervonotkatska Street 78, Kyiv 02094, Ukraine, Chervonotkatska Street 78, Kyiv; 02094 Ukraine
- Taras Shevchenko National University of Kyiv; Ukraine
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15
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Liu L, Tan C, Fan R, Wang Z, Du H, Xu K, Tan J. I2/TBHP-Mediated tandem cyclization and oxidation reaction: Facile access to 2-substituted thiazoles and benzothiazoles. Org Biomol Chem 2019; 17:252-256. [DOI: 10.1039/c8ob02826e] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The efficient synthesis of 2-substituted thiazoles and benzothiazoles has been accomplished employing readily available cysteine esters and 2-aminobenzenethiols as N and S sources.
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Affiliation(s)
- Li Liu
- Department of Organic Chemistry
- College of Science
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Chen Tan
- Department of Organic Chemistry
- College of Science
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Rong Fan
- Department of Organic Chemistry
- College of Science
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Zihan Wang
- Department of Organic Chemistry
- College of Science
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Hongguang Du
- Department of Organic Chemistry
- College of Science
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
| | - Kun Xu
- College of Chemistry and Pharmaceutical Engineering
- Nanyang Normal University
- Nanyang
- P. R. China
| | - Jiajing Tan
- Department of Organic Chemistry
- College of Science
- Beijing University of Chemical Technology
- Beijing 100029
- P. R. China
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16
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Liu J, Wen Y, He F, Gao L, Gao L, Wang J, Wang X, Zhang Y, Hu L. Ruthenium(ii)-catalyzed C–O/C–S cyclization for the synthesis of 5-membered O-containing and S-containing heterocycles. Org Chem Front 2019. [DOI: 10.1039/c8qo01425f] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
An efficient and convenient method for the synthesis of oxazole derivatives from enamides has been established via a ruthenium-catalyzed C–O cyclization.
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Affiliation(s)
- Jian Liu
- Jiangsu Key Laboratory for Functional Substance of Chinese Medicine
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization
- Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy
- School of Pharmacy
- Nanjing University of Chinese Medicine
| | - Yu Wen
- Jiangsu Key Laboratory for Functional Substance of Chinese Medicine
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization
- Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy
- School of Pharmacy
- Nanjing University of Chinese Medicine
| | - Fengjun He
- Jiangsu Key Laboratory for Functional Substance of Chinese Medicine
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization
- Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy
- School of Pharmacy
- Nanjing University of Chinese Medicine
| | - Liang Gao
- Jiangsu Key Laboratory for Functional Substance of Chinese Medicine
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization
- Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy
- School of Pharmacy
- Nanjing University of Chinese Medicine
| | - Lina Gao
- Jiangsu Key Laboratory for Functional Substance of Chinese Medicine
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization
- Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy
- School of Pharmacy
- Nanjing University of Chinese Medicine
| | - Junwei Wang
- Jiangsu Key Laboratory for Functional Substance of Chinese Medicine
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization
- Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy
- School of Pharmacy
- Nanjing University of Chinese Medicine
| | - Xiachang Wang
- Jiangsu Key Laboratory for Functional Substance of Chinese Medicine
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization
- Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy
- School of Pharmacy
- Nanjing University of Chinese Medicine
| | - Yinan Zhang
- Jiangsu Key Laboratory for Functional Substance of Chinese Medicine
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization
- Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy
- School of Pharmacy
- Nanjing University of Chinese Medicine
| | - Lihong Hu
- Jiangsu Key Laboratory for Functional Substance of Chinese Medicine
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization
- Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy
- School of Pharmacy
- Nanjing University of Chinese Medicine
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17
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Kumar SV, Acharya A, Ila H. Synthesis of 2,4,5-Trisubstituted Oxazoles with Complementary Regioselectivity from α-Oxoketene Dithioacetals and β-(Methylthio)-β-(het)aryl-2-propenones. J Org Chem 2018; 83:6607-6622. [DOI: 10.1021/acs.joc.8b00900] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Siripuram Vijay Kumar
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research(JNCASR), Jakkur, Bangalore 560064, India
| | - Anand Acharya
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research(JNCASR), Jakkur, Bangalore 560064, India
| | - Hiriyakkanavar Ila
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research(JNCASR), Jakkur, Bangalore 560064, India
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18
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Yang X, Guo X, Qin M, Yuan X, Jing H, Chen B. Metal-free iodine(iii)-promoted synthesis of 2,5-diaryloxazoles. Org Biomol Chem 2018; 16:3104-3108. [PMID: 29645044 DOI: 10.1039/c8ob00401c] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
A nonmetal-catalyzed oxidative cyclization to achieve 2,5-disubstituted oxazoles from inexpensive and readily available substituted chalcone, (diacetoxyiodo)benzene (PIDA) and ammonium acetate (NH4OAc) at room temperature is described. The reaction forms a variety of 2,5-diaryloxazoles in good to excellent yields with broad substrate scope under mild conditions without the requirement of ligands and additional bases.
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Affiliation(s)
- Xueying Yang
- State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
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19
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Pan J, Li X, Qiu X, Luo X, Jiao N. Copper-Catalyzed Oxygenation Approach to Oxazoles from Amines, Alkynes, and Molecular Oxygen. Org Lett 2018; 20:2762-2765. [PMID: 29664305 DOI: 10.1021/acs.orglett.8b00992] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A novel and efficient oxygenation approach to trisubstituted oxazoles via a copper-catalyzed aerobic oxidative dehydrogenative annulation of amines, alkynes, and O2 has been developed. This transformation combines dioxygen activation and oxidative C-H bond functionalization and provides a practical protocol for the preparation of oxazole derivatives, which are privileged units found in various bioactive compounds or other natural products. 18O-labeling experiments were conducted to reveal that oxygenation was involved in this chemistry.
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Affiliation(s)
- Jun Pan
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Xinyao Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Xu Qiu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Xiao Luo
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China
| | - Ning Jiao
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences , Peking University , Xue Yuan Road 38 , Beijing 100191 , China.,Shanghai Key Laboratory of Green Chemistry and Chemical Processes , East China Normal University , Shanghai 200062 , China
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20
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Gracia-Vitoria J, Osante I, Cativiela C, Merino P, Tejero T. Self-Regeneration of Chirality with l-Cysteine through 1,3-Dipolar Cycloadditions between Diazoalkanes and Enantiomerically Pure Thiazolines: Experimental and Computational Studies. J Org Chem 2018. [DOI: 10.1021/acs.joc.8b00312] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- J. Gracia-Vitoria
- Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea-ISQCH, CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
| | - I. Osante
- Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea-ISQCH, CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
| | - C. Cativiela
- Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea-ISQCH, CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
| | - P. Merino
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), Universidad de Zaragoza, Zaragoza 50009, Spain
| | - T. Tejero
- Departamento de Química Orgánica, Instituto de Síntesis Química y Catálisis Homogénea-ISQCH, CSIC-Universidad de Zaragoza, Zaragoza 50009, Spain
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21
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Liu Y, He P, Zhang Y, Zhang X, Liu J, Du Y. One-Pot Enantiomeric Synthesis of Thiazole-Containing Amino Acids: Total Synthesis of Venturamides A and B. J Org Chem 2018. [DOI: 10.1021/acs.joc.8b00244] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yi Liu
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- School of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China
| | - Peng He
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yang Zhang
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xiangyu Zhang
- School of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, China
| | - Jun Liu
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yuguo Du
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- School of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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22
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Allred TK, Manoni F, Harran PG. Exploring the Boundaries of “Practical”: De Novo Syntheses of Complex Natural Product-Based Drug Candidates. Chem Rev 2017; 117:11994-12051. [DOI: 10.1021/acs.chemrev.7b00126] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tyler K. Allred
- Department of Chemistry and
Biochemistry, University of California−Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095-1569, United States
| | - Francesco Manoni
- Department of Chemistry and
Biochemistry, University of California−Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095-1569, United States
| | - Patrick G. Harran
- Department of Chemistry and
Biochemistry, University of California−Los Angeles, 607 Charles
E. Young Drive East, Los Angeles, California 90095-1569, United States
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23
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Yang W, Zhang R, Yi F, Cai M. A Heterogeneous Gold(I)-Catalyzed [2 + 2 + 1] Annulation of Terminal Alkynes, Nitriles, and Oxygen Atoms Leading to 2,5-Disubstituted Oxazoles. J Org Chem 2017; 82:5204-5211. [PMID: 28459566 DOI: 10.1021/acs.joc.7b00386] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first heterogeneous gold(I)-catalyzed [2 + 2 + 1] annulation of terminal alkynes, nitriles, and oxygen atoms has been achieved by using an MCM-41-immobilized phosphine-gold(I) complex as catalyst and 8-methylquinoline N-oxide as oxidant under mild conditions, yielding a variety of 2,5-disubstituted oxazoles in good to excellent yields with broad substrate scope. The new heterogeneous gold(I) catalyst can easily be recovered by simple filtration of the reaction solution and recycled for at least eight times without significant loss of activity.
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Affiliation(s)
- Weisen Yang
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University , Nanchang 330022, P. R. China.,College of Ecology and Resources Engineering, Wuyi University , Wuyishan City 354300, P. R. China
| | - Rongli Zhang
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University , Nanchang 330022, P. R. China
| | - Feiyan Yi
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University , Nanchang 330022, P. R. China
| | - Mingzhong Cai
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education and College of Chemistry & Chemical Engineering, Jiangxi Normal University , Nanchang 330022, P. R. China
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24
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Li M, Han P, Mao ZY, Zhou W, Si CM, Xiong J, Wei BG, Hu JF. Studies toward asymmetric synthesis of hoiamides A and B. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.11.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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Williams DR, Donnell AF, Kammler DC, Ward SA, Taylor L. Studies of Azetidin-2-one as a Reactive Enolate Synthon of β-Alanine for Condensations with Aldehydes and Ketones. J Org Chem 2016; 81:10463-10475. [PMID: 27627106 DOI: 10.1021/acs.joc.6b01585] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Studies describe formation of the lithium enolate of N-(4-methoxybenzyloxy)azetidin-2-one (1) and characterization of representative aldol reactions with aldehydes and ketones. Diastereoselectivity features the production of anti-aldol adducts from α,β-unsaturated ketones and α-branched aliphatic aldehydes. The stereoselectivity is rationalized via closed, six-membered transition-state arrangements leading to the formation of Felkin-Anh and anti-Felkin products. Examples illustrate the direct incorporation of monocyclic β-lactams into a variety of molecular architectures. The utility of 1 as an enolate synthon of homoglycine (β-alanine) is illustrated by the efficient synthesis of novel β-amino acid derivatives, including complex 4-hydroxy-2-pyridinones.
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Affiliation(s)
- David R Williams
- Department of Chemistry, Indiana University , Bloomington, Indiana 47405, United States
| | - Andrew F Donnell
- Department of Chemistry, Indiana University , Bloomington, Indiana 47405, United States
| | - David C Kammler
- Department of Chemistry, Indiana University , Bloomington, Indiana 47405, United States
| | - Sarah A Ward
- Department of Chemistry, Indiana University , Bloomington, Indiana 47405, United States
| | - Levin Taylor
- Department of Chemistry, Indiana University , Bloomington, Indiana 47405, United States
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26
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Kudo M, Carbajo López D, Maurizot V, Masu H, Tanatani A, Huc I. Synthesis and Conformational Analysis of Quinoline-Oxazole Peptides. European J Org Chem 2016. [DOI: 10.1002/ejoc.201600229] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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27
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Friestad GK, Banerjee K, Marié JC, Mali U, Yao L. Stereoselective access to tubuphenylalanine and tubuvaline: improved Mn-mediated radical additions and assembly of a tubulysin tetrapeptide analog. J Antibiot (Tokyo) 2016; 69:294-8. [PMID: 26883395 PMCID: PMC4924578 DOI: 10.1038/ja.2016.7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 01/12/2016] [Accepted: 01/18/2016] [Indexed: 01/05/2023]
Abstract
Synthesis of tubuphenylalanine and tubuvaline (Tuv), α-substituted γ-amino acid building blocks for tubulysin family of antimitotic compounds, has been improved using a radical addition reaction in the presence of unprotected hydroxyl functionality. The key carbon-carbon bond construction entails stereoselective Mn-mediated photolytic additions of alkyl iodides to the C=N bond of chiral N-acylhydrazones, and generates the chiral amines in high yield with complete stereocontrol. Reductive N-N bond cleavage and alcohol oxidation converted these amino alcohols into the corresponding γ-amino acids. The route to Tuv proceeded via peptide coupling with serine methyl ester, followed by a high-yielding sequence to convert the serine amide to a thiazole. Finally, peptide bond construction established the tubulysin framework in the form of a C-terminal alcohol analog. Attempted oxidation to the C-terminal carboxylate was unsuccessful; control experiments with dipeptide 18 showed a cyclization interfered with the desired oxidation process.
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Affiliation(s)
| | - Koushik Banerjee
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242 USA
| | | | - Umesh Mali
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242 USA
| | - Lei Yao
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242 USA
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28
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Essig S, Schmalzbauer B, Bretzke S, Scherer O, Koeberle A, Werz O, Müller R, Menche D. Predictive Bioinformatic Assignment of Methyl-Bearing Stereocenters, Total Synthesis, and an Additional Molecular Target of Ajudazol B. J Org Chem 2016; 81:1333-57. [DOI: 10.1021/acs.joc.5b02844] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Sebastian Essig
- Institut
für Organische Chemie, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Björn Schmalzbauer
- Kekulé-Institut
für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany
| | - Sebastian Bretzke
- Institut
für Organische Chemie, Ruprecht-Karls Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Olga Scherer
- Institute
of Pharmacy, Friedrich Schiller Universität Jena, Philosophenweg
14, 07743 Jena, Germany
| | - Andreas Koeberle
- Institute
of Pharmacy, Friedrich Schiller Universität Jena, Philosophenweg
14, 07743 Jena, Germany
| | - Oliver Werz
- Institute
of Pharmacy, Friedrich Schiller Universität Jena, Philosophenweg
14, 07743 Jena, Germany
| | - Rolf Müller
- Helmholtz
Institute for Pharmaceutical Research Saarland (HIPS) and Institut
for Pharmaceutical Biotechnology, Universität des Saarlandes, C 2.3, 66123 Saarbrücken, Germany
| | - Dirk Menche
- Kekulé-Institut
für Organische Chemie und Biochemie, Universität Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany
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29
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Abstract
The first total syntheses of newly isolated polyazole natural products azolemycins A–D, along with the synthesis of the tetra-oxazole non-natural analogue, are described.
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Affiliation(s)
| | - David J. Fox
- Department of Chemistry
- University of Warwick
- Coventry
- UK
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30
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Wada H, Williams HEL, Moody CJ. Total Synthesis of the Posttranslationally Modified Polyazole Peptide Antibiotic Plantazolicin A. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507062] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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Wada H, Williams HEL, Moody CJ. Total Synthesis of the Posttranslationally Modified Polyazole Peptide Antibiotic Plantazolicin A. Angew Chem Int Ed Engl 2015; 54:15147-51. [PMID: 26473502 DOI: 10.1002/anie.201507062] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Indexed: 11/06/2022]
Abstract
The power of rhodium-carbene methodology in chemistry is demonstrated by the synthesis of a structurally complex polyazole antibiotic. Plantazolicin A, a novel soil-bacterium metabolite, comprises a linear array of 10 five-membered rings in two pentacyclic regions that derive from ribosomal peptide synthesis followed by extensive posttranslational modification. The compound possesses potent antimicrobial activity, and is selectively active against the anthrax-causing organism. A conceptually different synthesis of plantazolicin A is reported in which the key steps are the use of rhodium(II)-catalyzed reactions of diazocarbonyl compounds to generate up to six of the seven oxazole rings of the antibiotic. NMR spectroscopic studies and molecular modeling reveal a likely dynamic hairpin conformation with a hinge region around the two isoleucine residues. The compound has modest activity against methicillin-resistant Staphylococcus aureus (MRSA).
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Affiliation(s)
- Hiroki Wada
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD (UK)
| | - Huw E L Williams
- School of Chemistry, University of Nottingham, Nottingham NG7 2RD (UK)
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32
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Zeng TT, Xuan J, Ding W, Wang K, Lu LQ, Xiao WJ. [3 + 2] Cycloaddition/Oxidative Aromatization Sequence via Photoredox Catalysis: One-Pot Synthesis of Oxazoles from 2H-Azirines and Aldehydes. Org Lett 2015; 17:4070-3. [DOI: 10.1021/acs.orglett.5b01994] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Ting-Ting Zeng
- Key Laboratory
of Pesticide
and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China
| | - Jun Xuan
- Key Laboratory
of Pesticide
and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China
| | - Wei Ding
- Key Laboratory
of Pesticide
and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China
| | - Kuan Wang
- Key Laboratory
of Pesticide
and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China
| | - Liang-Qiu Lu
- Key Laboratory
of Pesticide
and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China
| | - Wen-Jing Xiao
- Key Laboratory
of Pesticide
and Chemical Biology, Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, China
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33
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Gao WC, Hu F, Huo YM, Chang HH, Li X, Wei WL. I2-Catalyzed C–O Bond Formation and Dehydrogenation: Facile Synthesis of Oxazolines and Oxazoles Controlled by Bases. Org Lett 2015. [DOI: 10.1021/acs.orglett.5b01933] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Wen-Chao Gao
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R. China
| | - Fei Hu
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R. China
| | - Yu-Ming Huo
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R. China
| | - Hong-Hong Chang
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R. China
| | - Xing Li
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R. China
| | - Wen-Long Wei
- College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, P.R. China
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34
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Liu Y, Sun X, Zhang X, Liu J, Du Y. Concise synthesis of 2,4-disubstituted thiazoles from β-azido disulfides and carboxylic acids or anhydrides: asymmetric synthesis of cystothiazole C. Org Biomol Chem 2015; 12:8453-61. [PMID: 25223403 DOI: 10.1039/c4ob01460j] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel and efficient method for the one-pot synthesis of 2,4-disubstituted thiazoles from carboxylic acids or anhydrides is presented. Based on this new method, the total synthesis of the bis-2,4-disubstituted bis(thiazoles) natural product cystothiazole C is also presented.
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Affiliation(s)
- Yi Liu
- State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
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35
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36
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Ding H, DeRoy PL, Perreault C, Larivée A, Siddiqui A, Caldwell CG, Harran S, Harran PG. Electrolytic Macrocyclizations: Scalable Synthesis of a Diazonamide-Based Drug Development Candidate. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201411663] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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37
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Ding H, DeRoy PL, Perreault C, Larivée A, Siddiqui A, Caldwell CG, Harran S, Harran PG. Electrolytic macrocyclizations: scalable synthesis of a diazonamide-based drug development candidate. Angew Chem Int Ed Engl 2015; 54:4818-22. [PMID: 25729008 DOI: 10.1002/anie.201411663] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Indexed: 11/11/2022]
Abstract
An electrochemical method to synthesize the core macrolactam of diazonamides is described. Large ring-forming dehydrogenation is initiated by anodic oxidation at a graphite surface. The reaction requires no tailoring of the substrate and occurs at ambient temperature in aqueous DMF in an undivided cell open to air. This unique chemistry has enabled a concise, scalable preparation of DZ-2384; a refined analog of diazonamide A slated for clinical development as a cancer therapeutic.
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Affiliation(s)
- Hui Ding
- Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, California 90095-1569 (USA)
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38
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Li JL, Wang YC, Li WZ, Wang HS, Mo DL, Pan YM. A facile synthesis of 2,5-disubstituted oxazoles via a copper-catalyzed cascade reaction of alkenes with azides. Chem Commun (Camb) 2015; 51:17772-4. [DOI: 10.1039/c5cc06487b] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A novel approach to the synthesis of 2,5-disubstituted oxazoles is developed via a 1,3-dipolar cycloaddition/ring cleavage/1,2-H migration/denitrogenation/copper-catalyzed aerobic oxidative dehydrogenative cyclization cascade.
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Affiliation(s)
- Jiu-ling Li
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China)
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
| | - Ying-chun Wang
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China)
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
- College of Chemistry and Chemical Engineering
| | - Wei-ze Li
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China)
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
| | - Heng-shan Wang
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China)
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
| | - Dong-liang Mo
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China)
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
| | - Ying-ming Pan
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China)
- School of Chemistry and Pharmaceutical Sciences of Guangxi Normal University
- Guilin 541004
- People's Republic of China
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39
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Nagasawa K, Sedghi Masoud S, Tsushima Y, Iida K. Synthesis of Macrocyclic Penta- and Tetraoxazoles as G-Quadruplex Ligands. HETEROCYCLES 2015. [DOI: 10.3987/com-14-s(k)90] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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40
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Sun X, Liu Y, Liu J, Gu G, Du Y. Synthesis and structural reconfirmation of bacillamide B. Org Biomol Chem 2015; 13:4271-7. [DOI: 10.1039/c5ob00093a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis of bacillamide B was accomplished, the absolute configuration was reconfirmed as S, and the specific optical rotation was revised to (−).
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Affiliation(s)
- Xue Sun
- State Key Laboratory of Environmental Chemistry and Eco-toxicology
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing 100085
- China
| | - Yi Liu
- State Key Laboratory of Environmental Chemistry and Eco-toxicology
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing 100085
- China
| | - Jun Liu
- State Key Laboratory of Environmental Chemistry and Eco-toxicology
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing 100085
- China
| | - Guofeng Gu
- National Glycoengineering Research Center
- Shandong University
- Jinan 250100
- PR China
| | - Yuguo Du
- State Key Laboratory of Environmental Chemistry and Eco-toxicology
- Research Center for Eco-Environmental Sciences
- Chinese Academy of Sciences
- Beijing 100085
- China
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41
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Doi T, Yoshida M, Shibata K. Total Synthesis of Telomestatin and its Analogues. J SYN ORG CHEM JPN 2015. [DOI: 10.5059/yukigoseikyokaishi.73.3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Takayuki Doi
- Graduate School of Pharmaceutical Sciences, Tohoku University
| | | | - Kazuaki Shibata
- Department of Applied Chemistry, Tokyo Institute of Technology
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42
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Fan YS, Das U, Hsiao MY, Liu MH, Lin W. Chemoselective Intramolecular Wittig Reactions for the Synthesis of Oxazoles and Benzofurans. J Org Chem 2014; 79:11567-82. [DOI: 10.1021/jo502232q] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yu-Shiou Fan
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, R.O.C
| | - Utpal Das
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, R.O.C
| | - Ming-Yu Hsiao
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, R.O.C
| | - Meng-Hsien Liu
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, R.O.C
| | - Wenwei Lin
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, R.O.C
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43
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Kokotos G, Feuerherm AJ, Barbayianni E, Shah I, Sæther M, Magrioti V, Nguyen T, Constantinou-Kokotou V, Dennis EA, Johansen B. Inhibition of group IVA cytosolic phospholipase A2 by thiazolyl ketones in vitro, ex vivo, and in vivo. J Med Chem 2014; 57:7523-35. [PMID: 25152071 DOI: 10.1021/jm500192s] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Group IVA cytosolic phospholipase A2 (GIVA cPLA2) is the rate-limiting provider of pro-inflammatory mediators in many tissues and is thus an attractive target for the development of novel anti-inflammatory agents. In this work, we present the synthesis of new thiazolyl ketones and the study of their activities in vitro, in cells, and in vivo. Within this series of compounds, methyl 2-(2-(4-octylphenoxy)acetyl)thiazole-4-carboxylate (GK470) was found to be the most potent inhibitor of GIVA cPLA2, exhibiting an XI(50) value of 0.011 mole fraction in a mixed micelle assay and an IC50 of 300 nM in a vesicle assay. In a cellular assay using SW982 fibroblast-like synoviocytes, it suppressed the release of arachidonic acid with an IC50 value of 0.6 μM. In a prophylactic collagen-induced arthritis model, it exhibited an anti-inflammatory effect comparable to the reference drug methotrexate, whereas in a therapeutic model, it showed results comparable to those of the reference drug Enbrel. In both models, it significantly reduced plasma PGE2 levels.
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Affiliation(s)
- George Kokotos
- Laboratory of Organic Chemistry, Department of Chemistry, University of Athens, Panepistimiopolis , Athens 15771, Greece
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44
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Synthesis, characterization, crystal structures and biological activity of set of Cu(II) benzothiazole complexes: Artificial nucleases with cytotoxic activities. J Inorg Biochem 2014; 137:1-11. [DOI: 10.1016/j.jinorgbio.2014.04.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 04/01/2014] [Accepted: 04/02/2014] [Indexed: 12/20/2022]
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45
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Zheng J, Zhang M, Huang L, Hu X, Wu W, Huang H, Jiang H. Regioselective synthesis of oxazole derivatives via palladium-catalyzed and copper-mediated cascade oxidative cyclization. Chem Commun (Camb) 2014; 50:3609-11. [DOI: 10.1039/c3cc49788g] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A novel Pd-catalyzed/Cu-mediated oxidative cyclization to synthesize oxazoles via cascade formation of C–N and C–O bonds has been developed.
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Affiliation(s)
- Jia Zheng
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640, China
| | - Min Zhang
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640, China
| | - Liangbin Huang
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640, China
| | - Xiaohan Hu
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640, China
| | - Wanqing Wu
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640, China
| | - Huawen Huang
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640, China
| | - Huangfeng Jiang
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou 510640, China
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46
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Yuan G, Zhu Z, Gao X, Jiang H. Electrochemically promoted synthesis of polysubstituted oxazoles from β-diketone derivatives and benzylamines under mild conditions. RSC Adv 2014. [DOI: 10.1039/c4ra03865g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An efficient electrochemical route has been developed to synthesize polysubstituted oxazoles, without the use of hazardous oxidants and transition metal catalysts.
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Affiliation(s)
- Gaoqing Yuan
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou, China
| | - Zechen Zhu
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou, China
| | - Xiaofang Gao
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou, China
| | - Huanfeng Jiang
- School of Chemistry and Chemical Engineering
- South China University of Technology
- Guangzhou, China
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47
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Noël S, Hoegy F, Rivault F, Rognan D, Schalk IJ, Mislin GLA. Synthesis and biological properties of thiazole-analogues of pyochelin, a siderophore of Pseudomonas aeruginosa. Bioorg Med Chem Lett 2014; 24:132-5. [PMID: 24332092 DOI: 10.1016/j.bmcl.2013.11.054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 11/22/2013] [Accepted: 11/23/2013] [Indexed: 11/29/2022]
Abstract
Pyochelin is a siderophore common to all strains of Pseudomonas aeruginosa utilized by this Gram-negative bacterium to acquire iron(III). FptA is the outer membrane transporter responsible of ferric-pyochelin uptake in P. aeruginosa. We describe in this Letter the synthesis and the biological properties ((55)Fe uptake, binding to FptA) of several thiazole analogues of pyochelin. Among them we report in this Letter the two first pyochelin analogues able to bind FptA without promoting any iron uptake in P. aeruginosa.
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Affiliation(s)
- Sabrina Noël
- Team 'Transports Membranaires Bactériens', UMR 7242 CNRS-Université de Strasbourg, 300 Boulevard Sébastien Brant, BP 10413, F-67412 Illkirch-Graffenstaden Cedex, France
| | - Françoise Hoegy
- Team 'Transports Membranaires Bactériens', UMR 7242 CNRS-Université de Strasbourg, 300 Boulevard Sébastien Brant, BP 10413, F-67412 Illkirch-Graffenstaden Cedex, France
| | - Freddy Rivault
- Team 'Transports Membranaires Bactériens', UMR 7242 CNRS-Université de Strasbourg, 300 Boulevard Sébastien Brant, BP 10413, F-67412 Illkirch-Graffenstaden Cedex, France
| | - Didier Rognan
- Team 'Chémogénomique Structurale' Laboratoire d'Innovation Thérapeutique (LIT), UMR 7200 CNRS-Université de Strasbourg, Faculté de Pharmacie, 74 route du Rhin, 67400 Illkirch-Graffenstaden, France
| | - Isabelle J Schalk
- Team 'Transports Membranaires Bactériens', UMR 7242 CNRS-Université de Strasbourg, 300 Boulevard Sébastien Brant, BP 10413, F-67412 Illkirch-Graffenstaden Cedex, France
| | - Gaëtan L A Mislin
- Team 'Transports Membranaires Bactériens', UMR 7242 CNRS-Université de Strasbourg, 300 Boulevard Sébastien Brant, BP 10413, F-67412 Illkirch-Graffenstaden Cedex, France.
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48
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Shibata K, Yoshida M, Takahashi T, Takagi M, Shin-ya K, Doi T. Synthesis of Heptaoxazole Macrocyclic Analogues of Telomestatin and Evaluation of Their Telomerase Inhibitory Activities. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2013. [DOI: 10.1246/bcsj.20130198] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Kazuaki Shibata
- Department of Applied Chemistry, Tokyo Institute of Technology
| | | | | | - Motoki Takagi
- Biomedicinal Information Research Center (BIRC), Japan Biological Informatics Consortium (JBIC)
| | - Kazuo Shin-ya
- National Institute of Advanced Industrial Science and Technology (AIST)
| | - Takayuki Doi
- Graduate School of Pharmaceutical Sciences, Tohoku University
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49
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Matsuzawa A, Opie CR, Kumagai N, Shibasaki M. Direct Aldol Strategy in Enantioselective Total Synthesis of Thuggacin B. Chemistry 2013; 20:68-71. [DOI: 10.1002/chem.201304297] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2013] [Indexed: 11/06/2022]
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50
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Iida K, Nagasawa K. Macrocyclic Polyoxazoles as G-Quadruplex Ligands. CHEM REC 2013; 13:539-48. [DOI: 10.1002/tcr.201300015] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Indexed: 01/11/2023]
Affiliation(s)
- Keisuke Iida
- Tokyo University of Agriculture and Technology; 2-24-16 Naka-cho Koganei Tokyo 184-8588 Japan
| | - Kazuo Nagasawa
- Tokyo University of Agriculture and Technology; 2-24-16 Naka-cho Koganei Tokyo 184-8588 Japan
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