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Hargittay B, Mineev KS, Richter C, Sreeramulu S, Jonker HRA, Saxena K, Schwalbe H. NMR resonance assignment of a fibroblast growth factor 8 splicing isoform b. BIOMOLECULAR NMR ASSIGNMENTS 2023; 17:10.1007/s12104-023-10132-8. [PMID: 37118562 DOI: 10.1007/s12104-023-10132-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Accepted: 04/24/2023] [Indexed: 06/02/2023]
Abstract
The splicing isoform b of human fibroblast growth factor 8 (FGF8b) is an important regulator of brain embryonic development. Here, we report the almost complete NMR chemical shift assignment of the backbone and aliphatic side chains of FGF8b. Obtained chemical shifts are in good agreement with the previously reported X-ray data, excluding the N-terminal gN helix, which apparently forms only in complex with the receptor. The reported data provide an NMR starting point for the investigation of FGF8b interaction with its receptors and with potential drugs or inhibitors.
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Affiliation(s)
- Bruno Hargittay
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance (BMRZ), Johann Wolfgang Goethe University, Max-von-Laue-Str. 7, 60438, Frankfurt/Main, Germany
| | - Konstantin S Mineev
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance (BMRZ), Johann Wolfgang Goethe University, Max-von-Laue-Str. 7, 60438, Frankfurt/Main, Germany
| | - Christian Richter
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance (BMRZ), Johann Wolfgang Goethe University, Max-von-Laue-Str. 7, 60438, Frankfurt/Main, Germany
| | - Sridhar Sreeramulu
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance (BMRZ), Johann Wolfgang Goethe University, Max-von-Laue-Str. 7, 60438, Frankfurt/Main, Germany
| | - Hendrik R A Jonker
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance (BMRZ), Johann Wolfgang Goethe University, Max-von-Laue-Str. 7, 60438, Frankfurt/Main, Germany
| | - Krishna Saxena
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance (BMRZ), Johann Wolfgang Goethe University, Max-von-Laue-Str. 7, 60438, Frankfurt/Main, Germany
- Structural Genomics Consortium, Johann Wolfgang Goethe University, Max-von-Laue-Str. 15, 60438, Frankfurt/Main, Germany
| | - Harald Schwalbe
- Institute for Organic Chemistry and Chemical Biology, Center for Biomolecular Magnetic Resonance (BMRZ), Johann Wolfgang Goethe University, Max-von-Laue-Str. 7, 60438, Frankfurt/Main, Germany.
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Pagano K, Listro R, Linciano P, Rossi D, Longhi E, Taraboletti G, Molinari H, Collina S, Ragona L. Identification of a novel extracellular inhibitor of FGF2/FGFR signaling axis by combined virtual screening and NMR spectroscopy approach. Bioorg Chem 2023; 136:106529. [PMID: 37084585 DOI: 10.1016/j.bioorg.2023.106529] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Accepted: 04/03/2023] [Indexed: 04/23/2023]
Abstract
The aberrant activation of the fibroblast growth factor 2 (FGF2)/fibroblast growth factor receptor (FGFR) signalling pathway drives severe pathologies, including cancer development and angiogenesis-driven pathologies. The perturbation of the FGF2/FGFR axis via extracellular allosteric small inhibitors is a promising strategy for developing FGFR inhibitors with improved safety and efficacy for cancer treatment. We have previously investigated the role of new extracellular inhibitors, such as rosmarinic acid (RA), which bind the FGFR-D2 domain and directly compete with FGF2 for the same binding site, enabling the disruption of the functional FGF2/FGFR interaction. To select ligands for the previously identified FGF2/FGFR RA binding site, NMR data-driven virtual screening has been performed on an in-house library of non-commercial small molecules and metabolites. A novel drug-like compound, a resorcinol derivative named RBA4 has been identified. NMR interaction studies demonstrate that RBA4 binds the FGF2/FGFR complex, in agreement with docking prediction. Residue-level NMR perturbations analysis highlights that the mode of action of RBA4 is similar to RA in terms of its ability to target the FGF2/FGFR-D2 complex, inducing perturbations on both proteins and triggering complex dissociation. Biological assays proved that RBA4 inhibited FGF2 proliferative activity at a level comparable to the previously reported natural product, RA. Identification of RBA4 chemical groups involved in direct interactions represents a starting point for further optimization of drug-like extracellular inhibitors with improved activity.
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Affiliation(s)
- Katiuscia Pagano
- Istituto di Scienze e Tecnologie Chimiche "Giulio Natta" (SCITEC), Consiglio Nazionale delle Ricerche, via Corti 12, 20133 Milano, Italy
| | - Roberta Listro
- University of Pavia, Department of Drug Sciences, Via Taramelli 12, 27100 Pavia, Italy
| | - Pasquale Linciano
- University of Pavia, Department of Drug Sciences, Via Taramelli 12, 27100 Pavia, Italy
| | - Daniela Rossi
- University of Pavia, Department of Drug Sciences, Via Taramelli 12, 27100 Pavia, Italy.
| | - Elisa Longhi
- Laboratory of Tumor Microenvironment, Department of Oncology, Istituto di Ricerche Farmacologiche, Mario Negri IRCCS, 24126 Bergamo, Italy
| | - Giulia Taraboletti
- Laboratory of Tumor Microenvironment, Department of Oncology, Istituto di Ricerche Farmacologiche, Mario Negri IRCCS, 24126 Bergamo, Italy
| | - Henriette Molinari
- Istituto di Scienze e Tecnologie Chimiche "Giulio Natta" (SCITEC), Consiglio Nazionale delle Ricerche, via Corti 12, 20133 Milano, Italy
| | - Simona Collina
- University of Pavia, Department of Drug Sciences, Via Taramelli 12, 27100 Pavia, Italy
| | - Laura Ragona
- Istituto di Scienze e Tecnologie Chimiche "Giulio Natta" (SCITEC), Consiglio Nazionale delle Ricerche, via Corti 12, 20133 Milano, Italy.
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3
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Pagano K, Longhi E, Molinari H, Taraboletti G, Ragona L. Inhibition of FGFR Signaling by Targeting FGF/FGFR Extracellular Interactions: Towards the Comprehension of the Molecular Mechanism through NMR Approaches. Int J Mol Sci 2022; 23:ijms231810860. [PMID: 36142770 PMCID: PMC9503799 DOI: 10.3390/ijms231810860] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/09/2022] [Accepted: 09/13/2022] [Indexed: 12/02/2022] Open
Abstract
NMR-based approaches play a pivotal role in providing insight into molecular recognition mechanisms, affording the required atomic-level description and enabling the identification of promising inhibitors of protein–protein interactions. The aberrant activation of the fibroblast growth factor 2 (FGF2)/fibroblast growth factor receptor (FGFR) signaling pathway drives several pathologies, including cancer development, metastasis formation, resistance to therapy, angiogenesis-driven pathologies, vascular diseases, and viral infections. Most FGFR inhibitors targeting the intracellular ATP binding pocket of FGFR have adverse effects, such as limited specificity and relevant toxicity. A viable alternative is represented by targeting the FGF/FGFR extracellular interactions. We previously identified a few small-molecule inhibitors acting extracellularly, targeting FGFR or FGF. We have now built a small library of natural and synthetic molecules that potentially act as inhibitors of FGF2/FGFR interactions to improve our understanding of the molecular mechanisms of inhibitory activity. Here, we provide a comparative analysis of the interaction mode of small molecules with the FGF2/FGFR complex and the single protein domains. DOSY and residue-level NMR analysis afforded insights into the capability of the potential inhibitors to destabilize complex formation, highlighting different mechanisms of inhibition of FGF2-induced cell proliferation.
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Affiliation(s)
- Katiuscia Pagano
- Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC), via Corti 12, 20133 Milano, Italy
- Correspondence: (K.P.); (L.R.)
| | - Elisa Longhi
- Laboratory of Tumour Microenvironment, Department of Oncology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 24126 Bergamo, Italy
| | - Henriette Molinari
- Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC), via Corti 12, 20133 Milano, Italy
| | - Giulia Taraboletti
- Laboratory of Tumour Microenvironment, Department of Oncology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 24126 Bergamo, Italy
| | - Laura Ragona
- Istituto di Scienze e Tecnologie Chimiche “Giulio Natta” (SCITEC), via Corti 12, 20133 Milano, Italy
- Correspondence: (K.P.); (L.R.)
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Zhang X, Wen X, Hu G, Zhang Q, Sun Q, Jia Y, Liu Y, Lin H, Li H. The fibroblast growth factor receptor antagonist SSR128129E inhibits fat accumulation via suppressing adipogenesis in mice. Mol Biol Rep 2022; 49:8641-8649. [PMID: 35731366 DOI: 10.1007/s11033-022-07699-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2022] [Accepted: 06/09/2022] [Indexed: 12/16/2022]
Abstract
BACKGROUND AS an allosteric inhibitor of fibroblast growth factor receptors (FGFRs), SSR128129E (SSR) extensively inhibits the fibroblast growth factor (FGF) signaling. Given the metabolic importance of FGFs and the global epidemic of obesity, we explored the effect of SSR on fat metabolism. METHODS AND RESULTS Three-week-old male mice were administered intragastrically with SSR (30 mg/kg/day) or PBS for 5 weeks. The effects of SSR on white and brown fat metabolism were investigated by respiratory metabolic monitoring, histological assessment and molecular analysis. Results indicated that SSR administration significantly reduced the body weight gain and the fat content of mice. SSR did not increase, but decreased the thermogenic capability of both brown and white fat. However, SSR markedly suppressed adipogenesis of adipose tissues. Further study demonstrated the involvement of ERK signaling in the action of SSR. CONCLUSIONS SSR may be a promising drug candidate for the prevention of obesity via suppressing adipogenesis. However, the influence of SSR on thermogenesis in humans should be further investigated before its clinical application.
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Affiliation(s)
- Xinzhi Zhang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China
| | - Xin Wen
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China
| | - Geng Hu
- College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai'an, 271018, China
| | - Qiang Zhang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China
| | - Qianying Sun
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China
| | - Yanxin Jia
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China
| | - Yan Liu
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China
| | - Hai Lin
- College of Animal Science and Veterinary Medicine, Shandong Agricultural University, Tai'an, 271018, China.
| | - Haifang Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, 271018, China.
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5
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Hany R, Leyris JP, Bret G, Mallié S, Sar C, Thouaye M, Hamze A, Provot O, Sokoloff P, Valmier J, Villa P, Rognan D. High-Throughput Screening for Extracellular Inhibitors of the FLT3 Receptor Tyrosine Kinase Reveals Chemically Diverse and Druggable Negative Allosteric Modulators. ACS Chem Biol 2022; 17:709-722. [PMID: 35227060 DOI: 10.1021/acschembio.2c00048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Inhibiting receptor tyrosine kinases is commonly achieved by two main strategies targeting either the intracellular kinase domain by low molecular weight compounds or the extracellular ligand-binding domain by monoclonal antibodies. Identifying small molecules able to inhibit RTKs at the extracellular level would be highly desirable to gain exquisite selectivity but is believed to be challenging owing to the size of RTK endogenous ligands (cytokines, growth factors) and the topology of RTK extracellular domains. We here report the high-throughput screening of the French Chemical Library (48K compounds) for extracellular inhibitors of the Fms-like tyrosine kinase 3 (FLT3) receptor tyrosine kinase, by a homogeneous time-resolved fluorescence competition assay. A total of 679 small molecular weight ligands (1.4%) were confirmed to strongly inhibit (>75%) the binding of the fluorescent labeled FLT3 ligand (FL cytokine) to FLT3 overexpressed in HEK-293 cells, at two different concentrations (5 and 20 μM). Concentration-response curves, obtained for 111 lead-like molecules, confirmed the unexpected tolerance of the FLT3 extracellular domain for low molecular weight druggable inhibitors exhibiting submicromolar potencies, chemical diversity, and promising pharmacokinetic properties. Further investigation of one hit confirmed inhibitory properties in dorsal root ganglia neurons and in a mouse model of neuropathic pain.
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Affiliation(s)
- Romain Hany
- Plate-forme de Chimie Biologique Intégrative de Strasbourg (PCBIS), UAR3286 CNRS-Université de Strasbourg, Institut du Médicament de Strasbourg, ESBS Pôle API, Bld Sébastien Brant, 67412 Illkirch Cedex, France
| | - Jean-Philippe Leyris
- Institut des Neurosciences de Montpellier (INM), INSERM, Institut National de la Santé et de la Recherche Médicale, UMR1051, Hôpital Saint-Eloi, 34000 Montpellier, France
- Université de Montpellier, 34000 Montpellier, France
- BIODOL Therapeutics, CAP Alpha, 34830 Clapiers, France
| | - Guillaume Bret
- Laboratoire d’Innovation Thérapeutique (LIT), UMR7200 CNRS-Université de Strasbourg, 67400 Illkirch, France
| | - Sylvie Mallié
- Institut des Neurosciences de Montpellier (INM), INSERM, Institut National de la Santé et de la Recherche Médicale, UMR1051, Hôpital Saint-Eloi, 34000 Montpellier, France
- Université de Montpellier, 34000 Montpellier, France
| | - Chamroeun Sar
- Institut des Neurosciences de Montpellier (INM), INSERM, Institut National de la Santé et de la Recherche Médicale, UMR1051, Hôpital Saint-Eloi, 34000 Montpellier, France
- Université de Montpellier, 34000 Montpellier, France
| | - Maxime Thouaye
- Institut des Neurosciences de Montpellier (INM), INSERM, Institut National de la Santé et de la Recherche Médicale, UMR1051, Hôpital Saint-Eloi, 34000 Montpellier, France
- Université de Montpellier, 34000 Montpellier, France
| | - Abdallah Hamze
- Université Paris-Saclay, CNRS, BioCIS, 92290, Châtenay-Malabry, France
| | - Olivier Provot
- Université Paris-Saclay, CNRS, BioCIS, 92290, Châtenay-Malabry, France
| | | | - Jean Valmier
- Institut des Neurosciences de Montpellier (INM), INSERM, Institut National de la Santé et de la Recherche Médicale, UMR1051, Hôpital Saint-Eloi, 34000 Montpellier, France
- Université de Montpellier, 34000 Montpellier, France
| | - Pascal Villa
- Plate-forme de Chimie Biologique Intégrative de Strasbourg (PCBIS), UAR3286 CNRS-Université de Strasbourg, Institut du Médicament de Strasbourg, ESBS Pôle API, Bld Sébastien Brant, 67412 Illkirch Cedex, France
| | - Didier Rognan
- Laboratoire d’Innovation Thérapeutique (LIT), UMR7200 CNRS-Université de Strasbourg, 67400 Illkirch, France
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6
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Pagano K, Carminati L, Tomaselli S, Molinari H, Taraboletti G, Ragona L. Molecular Basis of the Antiangiogenic Action of Rosmarinic Acid, a Natural Compound Targeting Fibroblast Growth Factor-2/FGFR Interactions. Chembiochem 2021; 22:160-169. [PMID: 32975328 DOI: 10.1002/cbic.202000610] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 09/24/2020] [Indexed: 12/12/2022]
Abstract
Fibroblast growth factor (FGF2)/fibroblast growth factor receptor (FGFR) signalling plays a major role both in physiology and in several pathologies, including cancer development, metastasis formation and resistance to therapy. The development of small molecules, acting extracellularly to target FGF2/FGFR interactions, has the advantage of limiting the adverse effects associated with current intracellular FGFR inhibitors. Herein, we discuss the ability of the natural compound rosmarinic acid (RA) to induce FGF2/FGFR complex dissociation. The molecular-level description of the FGF2/FGFR/RA system, by NMR spectroscopy and docking, clearly demonstrates that RA binds to the FGFR-D2 domain and directly competes with FGF2 for the same binding site. Direct and allosteric perturbations combine to destabilise the complex. The proposed molecular mechanism is validated by cellular studies showing that RA inhibits FGF2-induced endothelial cell proliferation and FGFR activation. Our results can serve as the basis for the development of new extracellular inhibitors of the FGF/FGFR pathways.
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Affiliation(s)
- Katiuscia Pagano
- Istituto di Scienze e Tecnologie Chimiche (SCITEC) CNR, Institution, Via Corti 12, 20133, Milano, Italy
| | - Laura Carminati
- Laboratory of Tumour Microenvironment, Department of Oncology Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 24126, Bergamo, Italy
| | - Simona Tomaselli
- Istituto di Scienze e Tecnologie Chimiche (SCITEC) CNR, Institution, Via Corti 12, 20133, Milano, Italy
| | - Henriette Molinari
- Istituto di Scienze e Tecnologie Chimiche (SCITEC) CNR, Institution, Via Corti 12, 20133, Milano, Italy
| | - Giulia Taraboletti
- Laboratory of Tumour Microenvironment, Department of Oncology Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 24126, Bergamo, Italy
| | - Laura Ragona
- Istituto di Scienze e Tecnologie Chimiche (SCITEC) CNR, Institution, Via Corti 12, 20133, Milano, Italy
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7
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Sokolova EA, Festa AA, Subramani K, Rybakov VB, Varlamov AV, Voskressensky LG, Van der Eycken EV. Microwave-Assisted Synthesis of Fluorescent Pyrido[2,3- b]indolizines from Alkylpyridinium Salts and Enaminones. Molecules 2020; 25:E4059. [PMID: 32899473 PMCID: PMC7570714 DOI: 10.3390/molecules25184059] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 08/24/2020] [Accepted: 09/03/2020] [Indexed: 11/17/2022] Open
Abstract
Pyridinium ylides are well recognized as dipoles for cycloaddition reactions. In its turn, the microwave-assisted interaction of N-(cyanomethyl)-2-alkylpyridinium salts with enaminones unexpectedly proceeds as a domino sequence of cycloisomerization and cyclocondensation reactions, instead of a 1,3-dipolar cycloaddition. The reaction takes place in the presence of sodium acetate as base and employs benign solvents. The optical properties of the resulting pyrido[2,3-b]indolizines were studied, showing green light emission with high fluorescence quantum yields.
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Affiliation(s)
- Ekaterina A. Sokolova
- Organic Chemistry Department, Science Faculty, RUDN University, Miklukho-Maklaya st., 6, 117198 Moscow, Russia; (E.A.S.); (A.A.F.); (K.S.); (A.V.V.); (L.G.V.)
| | - Alexey A. Festa
- Organic Chemistry Department, Science Faculty, RUDN University, Miklukho-Maklaya st., 6, 117198 Moscow, Russia; (E.A.S.); (A.A.F.); (K.S.); (A.V.V.); (L.G.V.)
| | - Karthikeyan Subramani
- Organic Chemistry Department, Science Faculty, RUDN University, Miklukho-Maklaya st., 6, 117198 Moscow, Russia; (E.A.S.); (A.A.F.); (K.S.); (A.V.V.); (L.G.V.)
| | - Victor B. Rybakov
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory, 1–3, 119991 Moscow, Russia;
| | - Alexey V. Varlamov
- Organic Chemistry Department, Science Faculty, RUDN University, Miklukho-Maklaya st., 6, 117198 Moscow, Russia; (E.A.S.); (A.A.F.); (K.S.); (A.V.V.); (L.G.V.)
| | - Leonid G. Voskressensky
- Organic Chemistry Department, Science Faculty, RUDN University, Miklukho-Maklaya st., 6, 117198 Moscow, Russia; (E.A.S.); (A.A.F.); (K.S.); (A.V.V.); (L.G.V.)
| | - Erik V. Van der Eycken
- Organic Chemistry Department, Science Faculty, RUDN University, Miklukho-Maklaya st., 6, 117198 Moscow, Russia; (E.A.S.); (A.A.F.); (K.S.); (A.V.V.); (L.G.V.)
- Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Department of Chemistry, University of Leuven (KU Leuven), Celestijnenlaan 200F, B-3001 Leuven, Belgium
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8
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Sokolova EA, Festa AA, Golantsov NE, Lukonina NS, Ioffe IN, Varlamov AV, Voskressensky LG. Highly Fluorescent Pyrido[2,3-b
]indolizine-10-Carbonitriles through Pseudo Three-Component Reactions of N
-(Cyanomethyl)pyridinium Salts. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900995] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Ekaterina A. Sokolova
- Organic Chemistry Department; Science Faculty; Peoples' Friendship University of Russia (RUDN University); Miklukho-Maklaya st., 6 Moscow Russia
| | - Alexey A. Festa
- Organic Chemistry Department; Science Faculty; Peoples' Friendship University of Russia (RUDN University); Miklukho-Maklaya st., 6 Moscow Russia
| | - Nikita E. Golantsov
- Organic Chemistry Department; Science Faculty; Peoples' Friendship University of Russia (RUDN University); Miklukho-Maklaya st., 6 Moscow Russia
| | - Natalia S. Lukonina
- Department of Chemistry; Lomonosov Moscow State University; Leninskie Gory, 1-3 119991 Moscow Russia
| | - Ilya N. Ioffe
- Department of Chemistry; Lomonosov Moscow State University; Leninskie Gory, 1-3 119991 Moscow Russia
| | - Alexey V. Varlamov
- Organic Chemistry Department; Science Faculty; Peoples' Friendship University of Russia (RUDN University); Miklukho-Maklaya st., 6 Moscow Russia
| | - Leonid G. Voskressensky
- Organic Chemistry Department; Science Faculty; Peoples' Friendship University of Russia (RUDN University); Miklukho-Maklaya st., 6 Moscow Russia
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