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Nielsen AJ, Deng Z, McNulty J. The synthesis of atalantrenes B, C and D, styrene-dimers from the seeds of Atalantia monophylla. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2020.152716] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Wrzeszcz Z, Siedlecka R. Heteroaromatic N-Oxides in Asymmetric Catalysis: A Review. Molecules 2020; 25:molecules25020330. [PMID: 31947566 PMCID: PMC7024222 DOI: 10.3390/molecules25020330] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 01/10/2020] [Accepted: 01/12/2020] [Indexed: 11/18/2022] Open
Abstract
An increasing interest in the synthesis and use of optically active pyridine N-oxides as chiral controllers for asymmetric reactions has been observed in the last few years. Chiral heteroaromatic N-oxides can work as powerful electron-pair donors, providing suitable electronic environments in the transition state formed within the reaction. The nucleophilicity of the oxygen atom in N-oxides, coupled with a high affinity of silicon to oxygen, represent ideal properties for the development of synthetic methodology based on nucleophilic activation of organosilicon reagents. The application of chiral N-oxides as efficient organocatalysts in allylation, propargylation, allenylation, and ring-opening of meso-epoxides, as well as chiral ligands for metal complexes catalyzing Michael addition or nitroaldol reaction, can also be found in the literature. This review deals with stereoselective applications of N-oxides, and how the differentiating properties are correlated with their structure. It contains more recent results, covering approximately the last ten years. All the reported examples have been divided into five classes, according to the chirality elements present in their basic molecular frameworks.
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Ramachary DB, Reddy PS, Gujral J. Construction of 2-Thiabicyclo[3.3.1]nonanes by Organocatalytic Asymmetric Formal [3+3] Cycloaddition. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701617] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | - P. Srinivasa Reddy
- Catalysis Laboratory; School of Chemistry; University of Hyderabad; 500 046 Hyderabad- India
| | - Jagjeet Gujral
- Catalysis Laboratory; School of Chemistry; University of Hyderabad; 500 046 Hyderabad- India
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Thieury C, Lebouvier N, Le Guével R, Barguil Y, Herbette G, Antheaume C, Hnawia E, Asakawa Y, Nour M, Guillaudeux T. Mechanisms of action and structure-activity relationships of cytotoxic flavokawain derivatives. Bioorg Med Chem 2017; 25:1817-1829. [PMID: 28214231 DOI: 10.1016/j.bmc.2017.01.049] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 01/23/2017] [Accepted: 01/25/2017] [Indexed: 01/21/2023]
Abstract
22 Flavokawain derivatives (FKd) were obtained by one step syntheses in order to conduct a SAR study to understand the structural requirements for optimum and selective cytotoxicity. FKd and natural flavokawains A and B found into kava, a South Pacific traditional beverage, were evaluated against nine cancer and one healthy cell lines. The targeted cell cycle phases as well as the effects on the induction of apoptosis and cell cycle protein levels were investigated. Therapeutic improvements (more activity and selectivity) were achieved with FKd compared to natural flavokawains and notably with the 2',3,4',6'-tetramethoxychalcone (FKd 19). FKd induced a G1/S arrest on p53 wild-type cells and an M arrest on p53 mutant-type, via the up-regulation of p21 and cyclin B1 proteins, followed by apoptosis. Moreover, FKd exhibited a 24h-effect on Akt/mTor normal cells versus a 48h-effect on Akt/mTor up-regulated cells. The SAR study resulted in the conclusion that trimethoxy A-ring allowed the best compromise between cytotoxicity and selectivity, as well as the substitution of the meta position on the B-ring and the use of halogens substituents.
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Affiliation(s)
- Charlotte Thieury
- LIVE EA 4243, Université de la Nouvelle-Calédonie, avenue James Cook, BPR4, 98851 Nouméa, New Caledonia.
| | - Nicolas Lebouvier
- LIVE EA 4243, Université de la Nouvelle-Calédonie, avenue James Cook, BPR4, 98851 Nouméa, New Caledonia
| | - Rémy Le Guével
- UMS 3480 CNRS/US INSERM 018 BIOSIT Plateforme ImPACcell, Université de Rennes 1, 2 avenue du Pr Léon Bernard, 35043 Rennes Cedex, France
| | - Yann Barguil
- LIVE EA 4243, Université de la Nouvelle-Calédonie, avenue James Cook, BPR4, 98851 Nouméa, New Caledonia; Laboratoire de Biochimie et d'Hémostase, Hôpital Gaston Bourret, 7 avenue Paul Doumer, 98800 Nouméa, New Caledonia
| | - Gaëtan Herbette
- Spectropole, FR1739 - Faculté de Saint-Jérôme, Université d'Aix-Marseille, 52 Avenue Escadrille Normandie Niemen, 13013 Marseille, France
| | - Cyril Antheaume
- LIVE EA 4243, Université de la Nouvelle-Calédonie, avenue James Cook, BPR4, 98851 Nouméa, New Caledonia
| | - Edouard Hnawia
- LIVE EA 4243, Université de la Nouvelle-Calédonie, avenue James Cook, BPR4, 98851 Nouméa, New Caledonia
| | - Yoshinori Asakawa
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Nishihamahoji-180 Yamashirocho, Tokushima 770-8514, Japan
| | - Mohammed Nour
- LIVE EA 4243, Université de la Nouvelle-Calédonie, avenue James Cook, BPR4, 98851 Nouméa, New Caledonia
| | - Thierry Guillaudeux
- UMS 3480 CNRS/US INSERM 018 BIOSIT Plateforme ImPACcell, Université de Rennes 1, 2 avenue du Pr Léon Bernard, 35043 Rennes Cedex, France; UMR INSERM U917 "Microenvironnement et cancer", Université de Rennes 1, 2 avenue du Pr Léon Bernard, 35043 Rennes Cedex, France; INSERM 440 Université de Rennes 1 "Oncogenesis Stress Signaling", Centre Eugène Marquis, 35043 Rennes Cedex, France
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