1
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Rota P, La Rocca P, Bonfante F, Pagliari M, Cirillo F, Piccoli M, Ghiroldi A, Franco V, Pappone C, Allevi P, Anastasia L. Interplay of Modified Sialic Acid Inhibitors and the Human Parainfluenza Virus 1 Hemagglutinin-Neuraminidase Active Site. ACS Med Chem Lett 2023; 14:1383-1388. [PMID: 37849540 PMCID: PMC10577888 DOI: 10.1021/acsmedchemlett.3c00291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Accepted: 09/20/2023] [Indexed: 10/19/2023] Open
Abstract
In the search for effective antivirals against Paramyxoviridae, the dynamics of human parainfluenza virus type 1 hemagglutinin-neuraminidase (hPIV1-HN) inhibition offers a promising perspective. This study focuses on the potential of C5- and C4-modified 2,3-unsaturated sialic acid (DANA) inhibitors and highlights their interaction with the hPIV1-HN enzyme. We show that a strategic substitution, replacing the C5 isopropyl group in BCX 2798 with a trifluoroacetyl function, increases inhibitory potency 3- to 4-fold. At the same time, we explore the special properties of the catalytic site of hPIV1-HN, which harbors only small substituents and favors a C4 sulfonylamido function over a carbonyl function, in contrast to the C4 pocket of Newcastle disease virus hemagglutinin-neuraminidase (NDV-HN). Based on these findings, we present a newly identified potent inhibitor that has the preferred C5 trifluoroacetamido and C4 trifluorosulfonylamide groups. The results of this study pave the way for a deeper understanding of the C4 and C5 binding pockets of hPIV1-HN and promote the development of new, more selective inhibitors.
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Affiliation(s)
- Paola Rota
- Department
of Biomedical, Surgical and Dental Sciences, Università degli Studi di Milano, 20133 Milan, Italy
- Institute
for Molecular and Translational Cardiology, San Donato Milanese, 20097 Milan, Italy
| | - Paolo La Rocca
- Institute
for Molecular and Translational Cardiology, San Donato Milanese, 20097 Milan, Italy
- Department
of Biomedical Sciences for Health, Università
degli Studi di Milano, 20133 Milan, Italy
| | - Francesco Bonfante
- Division
of Comparative Biomedical Sciences, Istituto
Zooprofilattico Sperimentale delle Venezie, 35020 Legnaro, Italy
| | - Matteo Pagliari
- Division
of Comparative Biomedical Sciences, Istituto
Zooprofilattico Sperimentale delle Venezie, 35020 Legnaro, Italy
- Division
of Pediatric Infectious Diseases, Department for Women’s and
Children’s Health, University of
Padua, 35128 Padua, Italy
| | - Federica Cirillo
- Institute
for Molecular and Translational Cardiology, San Donato Milanese, 20097 Milan, Italy
- Laboratory
of Stem Cells for Tissue Engineering, IRCCS
Policlinico San Donato, San Donato
Milanese, 20097 Milan Italy
| | - Marco Piccoli
- Institute
for Molecular and Translational Cardiology, San Donato Milanese, 20097 Milan, Italy
- Laboratory
of Stem Cells for Tissue Engineering, IRCCS
Policlinico San Donato, San Donato
Milanese, 20097 Milan Italy
| | - Andrea Ghiroldi
- Institute
for Molecular and Translational Cardiology, San Donato Milanese, 20097 Milan, Italy
- Laboratory
of Stem Cells for Tissue Engineering, IRCCS
Policlinico San Donato, San Donato
Milanese, 20097 Milan Italy
| | - Valentina Franco
- Division
of Clinical and Experimental Pharmacology, Department of Internal
Medicine and Therapeutics, University of
Pavia, 27100 Pavia, Italy
- IRCCS,
Mondino Foundation, 27100 Pavia, Italy
| | - Carlo Pappone
- Institute
for Molecular and Translational Cardiology, San Donato Milanese, 20097 Milan, Italy
- Arrhythmology
Department, IRCCS Policlinico San Donato, Piazza Malan 2, San Donato Milanese, 20097 Milan Italy
- Faculty of
Medicine, University of Vita-Salute San
Raffaele, 20132 Milan, Italy
| | - Pietro Allevi
- Department
of Biomedical, Surgical and Dental Sciences, Università degli Studi di Milano, 20133 Milan, Italy
| | - Luigi Anastasia
- Institute
for Molecular and Translational Cardiology, San Donato Milanese, 20097 Milan, Italy
- Laboratory
of Stem Cells for Tissue Engineering, IRCCS
Policlinico San Donato, San Donato
Milanese, 20097 Milan Italy
- Faculty of
Medicine, University of Vita-Salute San
Raffaele, 20132 Milan, Italy
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2
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La Rocca P, Lavota I, Piccoli M, Cirillo F, Ghiroldi A, Ciconte G, Pappone C, Allevi P, Rota P, Anastasia L. Analysis of the intramolecular 1,7-lactone of N-acetylneuraminic acid using HPLC-MS: relationship between detection and stability. Glycoconj J 2023; 40:343-354. [PMID: 37084126 DOI: 10.1007/s10719-023-10114-x] [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: 01/06/2023] [Accepted: 03/30/2023] [Indexed: 04/22/2023]
Abstract
A subclass of the sialic acid family consists of intramolecular lactones that may function as key indicators of physiological and pathological states. However, the existence of these compounds in free form is highly improbable, since they are unlikely to exist in an aqueous solution due to their lability. Current analytical method used to detect them in biological fluids has not recognized their reactivity in solution and is prone to misidentification. However, recent advances in synthetic methods for 1,7-lactones have allowed the preparation of these sialic acid derivatives as authentic reference standards. We report here the development of a new HPLC-MS method for the simultaneous detection of the 1,7-lactone of N-acetylneuraminic acid, its γ-lactone derivative, and N-acetylneuraminic acid that overcomes the limitations of the previous analytical procedure for their identification.
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Affiliation(s)
- Paolo La Rocca
- Department of Biomedical Sciences for Health, Università degli Studi di Milano, Milan, 20133, Italy
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, Milan, 20097, Italy
| | - Ivana Lavota
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, Milan, 20097, Italy
| | - Marco Piccoli
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, Milan, 20097, Italy
- Laboratory of Stem Cells for Tissue Engineering, IRCCS Policlinico San Donato, San Donato Milanese, Milan, 20097, Italy
| | - Federica Cirillo
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, Milan, 20097, Italy
- Laboratory of Stem Cells for Tissue Engineering, IRCCS Policlinico San Donato, San Donato Milanese, Milan, 20097, Italy
| | - Andrea Ghiroldi
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, Milan, 20097, Italy
- Laboratory of Stem Cells for Tissue Engineering, IRCCS Policlinico San Donato, San Donato Milanese, Milan, 20097, Italy
| | - Giuseppe Ciconte
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, Milan, 20097, Italy
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Milan, 20097, Italy
| | - Carlo Pappone
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, Milan, 20097, Italy
- Arrhythmology Department, IRCCS Policlinico San Donato, San Donato Milanese, Milan, 20097, Italy
- Faculty of Medicine, University of Vita-Salute San Raffaele, 20132, Milan, Italy
| | - Pietro Allevi
- Department of Biomedical, Surgical and Dental Sciences, Università degli Studi di Milano, Milan, 20133, Italy
| | - Paola Rota
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, Milan, 20097, Italy.
- Department of Biomedical, Surgical and Dental Sciences, Università degli Studi di Milano, Milan, 20133, Italy.
| | - Luigi Anastasia
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, Milan, 20097, Italy.
- Laboratory of Stem Cells for Tissue Engineering, IRCCS Policlinico San Donato, San Donato Milanese, Milan, 20097, Italy.
- Faculty of Medicine, University of Vita-Salute San Raffaele, 20132, Milan, Italy.
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3
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Rota P, La Rocca P, Bonfante F, Pagliari M, Piccoli M, Cirillo F, Ghiroldi A, Franco V, Pappone C, Allevi P, Anastasia L. Design, Synthesis, and Antiviral Evaluation of Sialic Acid Derivatives as Inhibitors of Newcastle Disease Virus Hemagglutinin-Neuraminidase: A Translational Study on Human Parainfluenza Viruses. ACS Infect Dis 2023; 9:617-630. [PMID: 36848501 PMCID: PMC10012260 DOI: 10.1021/acsinfecdis.2c00576] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
Global infections with viruses belonging to the Paramyxoviridae, such as Newcastle disease virus (NDV) or human parainfluenza viruses (hPIVs), pose a serious threat to animal and human health. NDV-HN and hPIVs-HN (HN hemagglutinin-neuraminidase) share a high degree of similarity in catalytic site structures; therefore, the development of an efficient experimental NDV host model (chicken) may be informative for evaluating the efficacy of hPIVs-HN inhibitors. As part of the broad research in pursuit of this goal and as an extension of our published work on antiviral drug development, we report here the biological results obtained with some newly synthesized C4- and C5-substituted 2,3-unsaturated sialic acid derivatives against NDV. All developed compounds showed high neuraminidase inhibitory activity (IC50 0.03-13 μM). Four molecules (9, 10, 23, 24) confirmed their high in vitro inhibitory activity, which caused a significant reduction of NDV infection in Vero cells, accompanied by very low toxicity.
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Affiliation(s)
- Paola Rota
- Department of Biomedical, Surgical and Dental Sciences, Università degli Studi di Milano, 20133 Milan, Italy.,Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, 20097 Milan, Italy
| | - Paolo La Rocca
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, 20097 Milan, Italy.,Department of Biomedical Sciences for Health, Università degli Studi di Milano, 20133 Milan, Italy
| | - Francesco Bonfante
- Division of Comparative Biomedical Sciences, Istituto Zooprofilattico Sperimentale delle Venezie, 35020 Legnaro, Italy
| | - Matteo Pagliari
- Division of Comparative Biomedical Sciences, Istituto Zooprofilattico Sperimentale delle Venezie, 35020 Legnaro, Italy
| | - Marco Piccoli
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, 20097 Milan, Italy.,Laboratory of Stem Cells for Tissue Engineering, IRCCS Policlinico San Donato, San Donato Milanese, 20097 Milan, Italy
| | - Federica Cirillo
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, 20097 Milan, Italy.,Laboratory of Stem Cells for Tissue Engineering, IRCCS Policlinico San Donato, San Donato Milanese, 20097 Milan, Italy
| | - Andrea Ghiroldi
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, 20097 Milan, Italy.,Laboratory of Stem Cells for Tissue Engineering, IRCCS Policlinico San Donato, San Donato Milanese, 20097 Milan, Italy
| | - Valentina Franco
- Division of Clinical and Experimental Pharmacology, Department of Internal Medicine and Therapeutics, University of Pavia, 27100 Pavia, Italy.,IRCCS, Mondino Foundation, 27100 Pavia, Italy
| | - Carlo Pappone
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, 20097 Milan, Italy.,Arrhythmology Department, IRCCS Policlinico San Donato, Piazza Malan 2, San Donato Milanese, 20097 Milan, Italy.,Faculty of Medicine, University of Vita-Salute San Raffaele, 20132 Milan, Italy
| | - Pietro Allevi
- Department of Biomedical, Surgical and Dental Sciences, Università degli Studi di Milano, 20133 Milan, Italy
| | - Luigi Anastasia
- Institute for Molecular and Translational Cardiology (IMTC), San Donato Milanese, 20097 Milan, Italy.,Laboratory of Stem Cells for Tissue Engineering, IRCCS Policlinico San Donato, San Donato Milanese, 20097 Milan, Italy.,Faculty of Medicine, University of Vita-Salute San Raffaele, 20132 Milan, Italy
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4
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Small-Molecules as Chemiluminescent Probes to Detect Lipase Activity. Int J Mol Sci 2022; 23:ijms23169039. [PMID: 36012304 PMCID: PMC9409280 DOI: 10.3390/ijms23169039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 08/06/2022] [Accepted: 08/10/2022] [Indexed: 11/16/2022] Open
Abstract
The set-up of highly sensitive detection tools to evaluate lipase activity remains a central goal in different fields. In this context, we proposed new chemiluminescent 1,2-dioxetane luminophores, sharing an octanoyl triggerable group, to monitor lipase activity. We herein report the synthesis and both the evaluation of their luminescence emission profile and their enzyme-substrate specificity, generated by three different commercial lipases (Candida cylindracea, Pseudomonas fluorescens, and Mucor miehei) and one esterase (porcine liver esterase, PLE, as a literature control). Remarkably, the present study confirmed the applicability of these 1,2-dioxetane luminophores as (i) highly efficient, broad-range, chemiluminescent probes for the detection and the enzymatic activity evaluation of lipases and as (ii) promising candidates for the future development of both flash- and glow-type luminescence assays.
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5
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Abd-Alla HI, Soltan MM, Hassan AZ, Taie HAA, Abo-Salem HM, Karam EA, El-Safty MM, Hanna AG. Cardenolides and pentacyclic triterpenes isolated from Acokanthera oblongifolia leaves: their biological activities with molecular docking study. ACTA ACUST UNITED AC 2020; 76:301-315. [PMID: 34218548 DOI: 10.1515/znc-2020-0198] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Accepted: 12/01/2020] [Indexed: 01/09/2023]
Abstract
Pentacyclic triterpenes and cardenolides were isolated from Acokanthera oblongifolia leaves. Their chemical structures were determined based on comprehensive 1D and 2D NMR spectroscopy. Their MIC was determined against 12 microorganisms. Their exerted cytotoxicity on the immortalized normal cells, hTERT-RPE1 was assessed by the sulforhodamine-B assay. The viral inhibitory effects of compounds against Newcastle disease virus (NDV) and H5N1 influenza virus IV were evaluated. Four in vitro antioxidant assays were performed in comparison with BHT and trolox and a weak activity was exhibited. Acovenoside A was with potent against H5N1-IV and NDV with IC50 ≤ 3.2 and ≤ 2.1 μg/ml and SI values of 93.75 and 95.23%, respectively, in comparison to ribavirin. Its CC50 record on Vero cells was > 400 and 200 μg/ml, respectively. Acobioside A was the most active compound against a broad range of microbes while Pseudomonas aeruginosa was the most sensitive. Its MIC (0.07 μg/ml) was 1/100-fold of the recorded CC50 (7.1 μg/ml/72 h) against hTERT-RPE1. The molecular docking of compounds on human DNA topoisomerase I (Top1-DNA) and IV glycoprotein hemagglutinin were studied using MOE program. This study has introduced the cardenolides rather than triterpenoids with the best docking score and binding interaction with the active site of the studied proteins.
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Affiliation(s)
- Howaida I Abd-Alla
- Chemistry of Natural Compounds Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki-Giza, 12622, Egypt
| | - Maha M Soltan
- Chemistry of Medicinal Plants Department, Biology Unit, Central Laboratory for Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki-Giza, 12622, Egypt
| | - Amal Z Hassan
- Chemistry of Natural Compounds Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki-Giza, 12622, Egypt
| | - Hanan A A Taie
- Plant Biochemistry Department, National Research Centre, Dokki-Giza, 12622, Egypt
| | - Heba M Abo-Salem
- Chemistry of Natural Compounds Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki-Giza, 12622, Egypt
| | - Eman A Karam
- Microbial Chemistry Department, National Research Centre, Dokki-Giza, 12622, Egypt
| | - Mounir M El-Safty
- Central Laboratory for Evaluation of Veterinary Biologics, Abbassia-Cairo, 13181, Egypt
| | - Atef G Hanna
- Chemistry of Natural Compounds Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki-Giza, 12622, Egypt
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6
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Rota P, La Rocca P, Franco V, Allevi P. Straightforward access to 2,3- and 3,4-unsaturated derivatives of N-glycolylneuraminic acid. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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7
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Rota P, La Rocca P, Allevi P, Pappone C, Anastasia L. Intramolecular Lactones of Sialic Acids. Int J Mol Sci 2020; 21:E8098. [PMID: 33143039 PMCID: PMC7663150 DOI: 10.3390/ijms21218098] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 10/27/2020] [Accepted: 10/28/2020] [Indexed: 12/22/2022] Open
Abstract
The so-called "sialo-chemical-biology" has become an attractive research area, as an increasing number of natural products containing a sialic acid moiety have been shown to play important roles in biological, pathological, and immunological processes. The intramolecular lactones of sialic acids are a subclass from this crucial family that could have central functions in the discrimination of physiological and pathological conditions. In this review, we report an in-depth analysis of the synthetic achievements in the preparation of the intramolecular lactones of sialic acids (1,4-, 1,7- and γ-lactones), in their free and/or protected form. In particular, recent advances in the synthesis of the 1,7-lactones have allowed the preparation of key sialic acid derivatives. These compounds could be used as authentic reference standards for their correct determination in biological samples, thus overcoming some of the limitations of the previous analytical procedures.
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Affiliation(s)
- Paola Rota
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, 20133 Milan, Italy;
| | - Paolo La Rocca
- Department of Biomedical Sciences for Health, University of Milan, 20133 Milan, Italy;
| | - Pietro Allevi
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, 20133 Milan, Italy;
| | - Carlo Pappone
- Arrhythmology Department, IRCCS Policlinico San Donato, 20097 San Donato Milanese, Milan, Italy;
- Faculty of Medicine, University of Vita-Salute San Raffaele, 20132 Milan, Italy
| | - Luigi Anastasia
- Faculty of Medicine, University of Vita-Salute San Raffaele, 20132 Milan, Italy
- Laboratory of Stem Cells for Tissue Engineering, IRCCS Policlinico San Donato, 20097 San Donato Milanese, Milan, Italy
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8
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La Rocca P, Rota P, Piccoli M, Cirillo F, Ghiroldi A, Franco V, Allevi P, Anastasia L. 2β-3,4-Unsaturated sialic acid derivatives: Synthesis optimization, and biological evaluation as Newcastle disease virus hemagglutinin-neuraminidase inhibitors. Bioorg Med Chem 2020; 28:115563. [PMID: 32616179 DOI: 10.1016/j.bmc.2020.115563] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 05/12/2020] [Accepted: 05/18/2020] [Indexed: 11/30/2022]
Abstract
The optimization of the synthetic protocol to obtain the 3,4-unsaturated sialic acid derivatives, through the fine-tuning of both the Ferrier glycosylation conditions and the subsequent hydrolysis work-up, is herein reported. The accomplishment of the desired β-anomers and some selected α-ones, in pure form, led us to evaluate their specific inhibitory activity towards NDV-HN and human sialidase NEU3. Importantly, the resulting data allowed the identification, for the first time, of three active 3,4-unsaturated sialic acid analogs, showing IC50 values against NDV-HN in the micromolar range.
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Affiliation(s)
- Paolo La Rocca
- Department of Biomedical Sciences for Health, University of Milan, Via Mangiagalli 31, 20133 Milan, Italy
| | - Paola Rota
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, 20133 Milan, Italy.
| | - Marco Piccoli
- Laboratory of Stem Cells for Tissue Engineering, IRCCS Policlinico San Donato, Piazza Malan 2, San Donato Milanese, 20097 Milan, Italy
| | - Federica Cirillo
- Laboratory of Stem Cells for Tissue Engineering, IRCCS Policlinico San Donato, Piazza Malan 2, San Donato Milanese, 20097 Milan, Italy
| | - Andrea Ghiroldi
- Laboratory of Stem Cells for Tissue Engineering, IRCCS Policlinico San Donato, Piazza Malan 2, San Donato Milanese, 20097 Milan, Italy
| | - Valentina Franco
- Department of Internal Medicine and Therapeutics, University of Pavia, Pavia, Italy; IRCCS Mondino Foundation, Pavia, Italy
| | - Pietro Allevi
- Department of Biomedical, Surgical and Dental Sciences, University of Milan, 20133 Milan, Italy
| | - Luigi Anastasia
- Laboratory of Stem Cells for Tissue Engineering, IRCCS Policlinico San Donato, Piazza Malan 2, San Donato Milanese, 20097 Milan, Italy; University of Vita-Salute San Raffaele, Milan, Italy.
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9
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Rota P, La Rocca P, Cirillo F, Piccoli M, Allevi P, Anastasia L. The acidic hydrolysis of N-acetylneuraminic 4,5-oxazoline allows a direct functionalization of the C5 position of Neu5Ac2en (DANA). RSC Adv 2020; 10:162-165. [PMID: 35492520 PMCID: PMC9048243 DOI: 10.1039/c9ra10215a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2019] [Accepted: 12/13/2019] [Indexed: 12/18/2022] Open
Abstract
The Neu5Ac 4,5-oxazoline ring-opening allows the direct generation of a free C5-amino group key to synthesize antiviral drugs.
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Affiliation(s)
- Paola Rota
- Department of Biomedical, Surgical and Dental Sciences
- University of Milan
- Milan
- Italy
| | - Paolo La Rocca
- Department of Biomedical Sciences for Health
- University of Milan
- Milan
- Italy
| | - Federica Cirillo
- Laboratory of Stem Cells for Tissue Engineering
- IRCCS Policlinico San Donato, San Donato Milanese
- Milan
- Italy
| | - Marco Piccoli
- Laboratory of Stem Cells for Tissue Engineering
- IRCCS Policlinico San Donato, San Donato Milanese
- Milan
- Italy
| | - Pietro Allevi
- Department of Biomedical, Surgical and Dental Sciences
- University of Milan
- Milan
- Italy
| | - Luigi Anastasia
- Laboratory of Stem Cells for Tissue Engineering
- IRCCS Policlinico San Donato, San Donato Milanese
- Milan
- Italy
- University of Vita-Salute San Raffaele
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10
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La Rocca P, Rota P, Piccoli M, Cirillo F, Orioli M, Ravelli A, Allevi P, Anastasia L. Lactonization Method To Assign the Anomeric Configuration of the 3,4-Unsaturated Congeners of N-Acetylneuraminic Acid. J Org Chem 2019; 84:5460-5470. [PMID: 30892893 DOI: 10.1021/acs.joc.9b00431] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Assigning the correct configuration at C2 in sialosides is a standing problem because of the absence of an anomeric hydrogen. All different empirical rules that have been proposed over the years lack general applicability. In particular, the correct configuration of several 3,4-unsaturated derivatives of N-acetylneuraminic acid (Neu5Ac), which have been recently shown to be novel sialidase/neuraminidase inhibitors, could only be tentatively assigned by similarity with the reported 3,4-unsaturated 2O-methyl sialosides. In this work, we overcome this problem as we devised a rapid synthetic method to unequivocally resolve the anomeric configuration of the 3,4-unsaturated Neu5Ac derivatives through the synthesis of the corresponding unreported unsaturated 1,7-lactones. Moreover, we discovered a diagnostic 13C nuclear magnetic resonance signal that allows the formulation of a new empirical rule for the direct assignment of the C2 stereochemistry of these molecules, even when only one of the two C2 epimers is available.
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Affiliation(s)
- Paolo La Rocca
- Department of Biomedical, Surgical and Dental Sciences , University of Milan , 20133 Milan , Italy
| | - Paola Rota
- Laboratory of Stem Cells for Tissue Engineering , IRCCS Policlinico San Donato Milanese , 20097 Milan , Italy.,Department of Biomedical, Surgical and Dental Sciences , University of Milan , 20133 Milan , Italy
| | - Marco Piccoli
- Laboratory of Stem Cells for Tissue Engineering , IRCCS Policlinico San Donato Milanese , 20097 Milan , Italy
| | - Federica Cirillo
- Laboratory of Stem Cells for Tissue Engineering , IRCCS Policlinico San Donato Milanese , 20097 Milan , Italy
| | - Marica Orioli
- Department of Biomedical, Surgical and Dental Sciences , University of Milan , 20133 Milan , Italy
| | - Alessandro Ravelli
- Department of Biomedical, Surgical and Dental Sciences , University of Milan , 20133 Milan , Italy
| | - Pietro Allevi
- Department of Biomedical, Surgical and Dental Sciences , University of Milan , 20133 Milan , Italy
| | - Luigi Anastasia
- Laboratory of Stem Cells for Tissue Engineering , IRCCS Policlinico San Donato Milanese , 20097 Milan , Italy.,Department of Biomedical Sciences for Health , University of Milan , Via Fratelli, Cervi 9 , Segrate, 20090 , Milan , Italy
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