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Sattler LE, Hilt G. Allylic Oxidation of Ester-Substituted 1,4-Dienes. J Org Chem 2020; 85:7595-7602. [DOI: 10.1021/acs.joc.0c00776] [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)
- Lars. E. Sattler
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Str. 4, D-35043 Marburg, Germany
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky Straße 9-11, D-26111 Oldenburg, Germany
| | - Gerhard Hilt
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky Straße 9-11, D-26111 Oldenburg, Germany
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Ivanova BB, Spiteller M. On the [2+2] cycloaddition reaction of configurationally locked polyenes – An experimental and theoretical study. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.05.064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Roehrs JA, Pistoia RP, Back DF, Zeni G. Diorganyl Dichalcogenides-Promoted Nucleophilic Closure of 1,4-Diyn-3-ols: Synthesis of 2-Benzoyl Chalcogenophenes. J Org Chem 2015; 80:12470-81. [PMID: 26561717 DOI: 10.1021/acs.joc.5b02334] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We report here the preparation of chalcogenophene derivatives via cyclization reactions of diynols promoted by diorganyl dichalcogenides and a halogen source. Different chalcogenophenes, such as 4-halo-selenophenes, 4-butylselenyl-selenophenes, halo-thiophenes, and 4-methylthio-thiophenes, were selectively prepared in good yields from the same starting materials. The results revealed that the halogen source had a significant effect on the proportion of 4-bromo-selenophenes and 4-butylselenyl-selenophenes. The best yields of 4-iodo-selenophenes were obtained with iodine as a halogen source, while the use of NBS gave exclusively the 4-butylselenyl-selenophenes. The experiments also revealed that the cyclization reaction to form 4-halo-thiophene derivatives can also be controlled changing the ratios of reagents. The 4-iodo-thiophenes were exclusively obtained by using dimethyl disulfide (2.0 equiv) and iodine (1.5 equiv), while the 4-bromo-thiophenes were obtained when the reaction was carried out with a 1.5 molar ratio of dimethyl disulfide and a halogen source. In addition, the reaction of diynols with an excess of dimethyl disulfide in the presence of NBS gave the 4-methylthio-thiophenes as sole products. We also studied the application of chalcogenophenes obtained as starting materials in the Suzuki, Sonogashira, and Ullmann cross-coupling reactions.
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Affiliation(s)
- Juliano A Roehrs
- Laboratório de Síntese, Reatividade, Avaliação Farmacológica e Toxicológica de Organocalcogênios and ‡Laboratório de Materiais Inorgânicos, CCNE, Universidade Federal de Santa Maria , Santa Maria, Rio Grande do Sul 97105-900, Brazil
| | - Renan P Pistoia
- Laboratório de Síntese, Reatividade, Avaliação Farmacológica e Toxicológica de Organocalcogênios and ‡Laboratório de Materiais Inorgânicos, CCNE, Universidade Federal de Santa Maria , Santa Maria, Rio Grande do Sul 97105-900, Brazil
| | - Davi F Back
- Laboratório de Síntese, Reatividade, Avaliação Farmacológica e Toxicológica de Organocalcogênios and ‡Laboratório de Materiais Inorgânicos, CCNE, Universidade Federal de Santa Maria , Santa Maria, Rio Grande do Sul 97105-900, Brazil
| | - Gilson Zeni
- Laboratório de Síntese, Reatividade, Avaliação Farmacológica e Toxicológica de Organocalcogênios and ‡Laboratório de Materiais Inorgânicos, CCNE, Universidade Federal de Santa Maria , Santa Maria, Rio Grande do Sul 97105-900, Brazil
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Heller L, Sommerwerk S, Tzschöckell F, Wiemann J, Schwarz S, Siewert B, Al-Harrasi A, Csuk R. First Occurrence of a Furano-glycyrrhetinoate and Its Cytotoxicity. Arch Pharm (Weinheim) 2015; 348:889-96. [DOI: 10.1002/ardp.201500318] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Revised: 10/20/2015] [Accepted: 10/21/2015] [Indexed: 01/05/2023]
Affiliation(s)
- Lucie Heller
- Department of Organic Chemistry; Martin-Luther-University Halle-Wittenberg; Halle (Saale) Germany
| | - Sven Sommerwerk
- Department of Organic Chemistry; Martin-Luther-University Halle-Wittenberg; Halle (Saale) Germany
| | - Felix Tzschöckell
- Department of Organic Chemistry; Martin-Luther-University Halle-Wittenberg; Halle (Saale) Germany
| | - Jana Wiemann
- Department of Organic Chemistry; Martin-Luther-University Halle-Wittenberg; Halle (Saale) Germany
| | - Stefan Schwarz
- Department of Organic Chemistry; Martin-Luther-University Halle-Wittenberg; Halle (Saale) Germany
| | - Bianka Siewert
- Department of Organic Chemistry; Martin-Luther-University Halle-Wittenberg; Halle (Saale) Germany
| | - Ahmed Al-Harrasi
- Chair of Oman's Medicinal Plants and Marine Natural Products; University of Nizwa, Birkat Al-Mauz; Nizwa Sultanate of Oman
| | - René Csuk
- Department of Organic Chemistry; Martin-Luther-University Halle-Wittenberg; Halle (Saale) Germany
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Taskaya S, Menges N, Balci M. Gold-catalyzed formation of pyrrolo- and indolo-oxazin-1-one derivatives: The key structure of some marine natural products. Beilstein J Org Chem 2015; 11:897-905. [PMID: 26124892 PMCID: PMC4464457 DOI: 10.3762/bjoc.11.101] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Accepted: 04/24/2015] [Indexed: 01/03/2023] Open
Abstract
Various N-propargylpyrrole and indolecarboxylic acids were efficiently converted into 3,4-dihydropyrrolo- and indolo-oxazin-1-one derivatives by a gold(III)-catalyzed cyclization reaction. Some of the products underwent TFA-catalyzed double bond isomerization and some did not. Cyclization reactions in the presence of alcohol catalyzed by Au(I) resulted in the formation of hemiacetals after cascade reactions.
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Affiliation(s)
- Sultan Taskaya
- Middle East Technical University, Department of Chemistry, Ankara, Turkey, 06800
| | - Nurettin Menges
- Middle East Technical University, Department of Chemistry, Ankara, Turkey, 06800 ; Yüzüncü Yil University, Faculty of Pharmacy, Van, Turkey, 65100
| | - Metin Balci
- Middle East Technical University, Department of Chemistry, Ankara, Turkey, 06800
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Ju C, Song S, Hwang S, Kim C, Kim M, Gu J, Oh YK, Lee K, Kwon J, Lee K, Kim WK, Choi Y. Discovery of novel (1S)-(-)-verbenone derivatives with anti-oxidant and anti-ischemic effects. Bioorg Med Chem Lett 2013; 23:5421-5. [PMID: 23953190 DOI: 10.1016/j.bmcl.2013.07.038] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2013] [Revised: 06/18/2013] [Accepted: 07/17/2013] [Indexed: 10/26/2022]
Abstract
A series of novel (1S)-(-)-verbenone derivatives was synthesized bearing a 4-styryl scaffold. The synthesized compounds were tested for their anti-oxidant, anti-excitotoxic, and anti-ischemic activities. These derivatives significantly reduced oxygen-glucose deprivation-induced neuronal injury and N-methyl-D-aspartic acid-evoked excitotoxicity in cortical neurons. Furthermore, compound 3f was identified as a potent anti-ischemic agent in an in vitro ischemic model, potentially due to the inhibition of N-methyl-D-aspartic acid-evoked excitotoxicity and oxidative/nitrosative stress.
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Affiliation(s)
- Chung Ju
- Department of Neuroscience, College of Medicine, Korea University, Seoul 136-705, Republic of Korea
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Csuk R, Siewert B, Wiemann J. A bioassay-driven discovery of an unexpected selenophene and its cytotoxicity. Bioorg Med Chem Lett 2013; 23:3542-6. [PMID: 23664875 DOI: 10.1016/j.bmcl.2013.04.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2013] [Revised: 04/11/2013] [Accepted: 04/13/2013] [Indexed: 11/18/2022]
Abstract
During the reaction of methyl 3β-acetoxy-glycyrrhetinate (1) with SeO2 significant amounts of a cytotoxic hitherto unprecedented triterpenoic selenophene 3 are formed. This compound stops cell proliferation and acts by apoptosis.
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Affiliation(s)
- René Csuk
- Martin-Luther-Universität Halle-Wittenberg, Organische Chemie, Kurt-Mothes-Str. 2, D-06120 Halle (Saale), Germany.
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Menges N, Sari O, Abdullayev Y, Erdem SS, Balci M. Design and synthesis of pyrrolotriazepine derivatives: an experimental and computational study. J Org Chem 2013; 78:5184-95. [PMID: 23647431 DOI: 10.1021/jo4001228] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The pyrrole derivatives having carbonyl groups at the C-2 position were converted to N-propargyl pyrroles. The reaction of those compounds with hydrazine monohydrate resulted in the formation of 5H-pyrrolo[2,1-d][1,2,5]triazepine derivatives. The synthesis of these compounds was accomplished in three steps starting from pyrrole. On the other hand, attempted cyclization of a pyrrole ester substituted with a propargyl group at the nitrogen atom gave, unexpectedly, the six-membered cyclization product, 2-amino-3-methylpyrrolo[1,2-a]pyrazin-1(2H)-one as the major product. The expected cyclization product with a seven-membered ring, 4-methyl-2,3-dihydro-1H-pyrrolo[2,1-d][1,2,5]triazepin-1-one was formed as the minor product and was converted quantitatively to the major product. The formation mechanism of the products was investigated, and the results obtained were also supported by theoretical calculations.
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Affiliation(s)
- Nurettin Menges
- Department of Chemistry, Middle East Technical University, 06800 Ankara, Turkey
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YALGUDRE RS, GOKAVI GS. Selenium dioxide catalysed oxidation of acetic acid hydrazide by bromate in aqueous hydrochloric acid medium. J CHEM SCI 2012. [DOI: 10.1007/s12039-012-0286-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Trujillo C, Mó O, Yáñez M, Silvi B. On the Bonding of Selenocyanates and Isoselenocyanates and Their Protonated Derivatives. J Chem Theory Comput 2008; 4:1593-9. [DOI: 10.1021/ct800178x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cristina Trujillo
- Departamento de Química, C-9. Universidad Autónoma de Madrid. Cantoblanco. 28049-Madrid. Spain, and Laboratoire de Chimie Théorique, UMR-CNRS-7616, Université de Paris 06, F-94000 Ivry, France
| | - Otilia Mó
- Departamento de Química, C-9. Universidad Autónoma de Madrid. Cantoblanco. 28049-Madrid. Spain, and Laboratoire de Chimie Théorique, UMR-CNRS-7616, Université de Paris 06, F-94000 Ivry, France
| | - Manuel Yáñez
- Departamento de Química, C-9. Universidad Autónoma de Madrid. Cantoblanco. 28049-Madrid. Spain, and Laboratoire de Chimie Théorique, UMR-CNRS-7616, Université de Paris 06, F-94000 Ivry, France
| | - Bernard Silvi
- Departamento de Química, C-9. Universidad Autónoma de Madrid. Cantoblanco. 28049-Madrid. Spain, and Laboratoire de Chimie Théorique, UMR-CNRS-7616, Université de Paris 06, F-94000 Ivry, France
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Chapter 5.1 Five-membered ring systems: Thiophenes & Se, Te analogs. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/s0959-6380(03)80008-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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