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Oliveira LR, Vidal DM, Freitas TR, de P Sabino A, Duarte LP, de Sousa GF. Synthesis and Cytotoxic Activity of Friedelinyl Esters. Chem Biodivers 2024:e202400652. [PMID: 38924342 DOI: 10.1002/cbdv.202400652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2024] [Revised: 06/15/2024] [Accepted: 06/22/2024] [Indexed: 06/28/2024]
Abstract
Commonly isolated from plants of Celastraceae family, pentacyclic triterpenoids have a broad spectrum of biological activities, such as antitumor, anti-inflammatory, antinociceptive properties, among others. Structural modifications in these triterpenoids can enhance their biological activity, as well as their selectivity, while improving their physicochemical and pharmacokinetic aspects. In this study, eight novel esters were synthesized: four derivatives of 3α-friedelinol (friedelan-3α-yl p-bromobenzoate (1a); friedelan-3α-yl naproxenate (1b); friedelan-3α-yl pent-4-ynoate (1c); friedelan-3α-yl undec-10-ynoate (1d)) and four derivatives of 3β-friedelinol (friedelan-3β-yl p-bromobenzoate (2a); friedelan-3β-yl naproxenate (2b); friedelan-3β-yl pent-4-ynoate (2c); friedelan-3β-yl undec-10-ynoate (2d)). Overall, 3α-friedelinol showed greater reactivity when compared to the β-epimer. The esters 1b-d and 2b-c were tested for antileukemic activity against THP-1 and K-562 cells but showed low cytotoxicity for both cell lines. The most active against THP-1 cells was friedelan-3β-yl naproxenate (2b, IC50=266±6 μM), and the most active against K-562 cells was friedelan-3α-yl pent-4-ynoate (1c, IC50=267±5 μM).
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Affiliation(s)
- Leila R Oliveira
- Departamento de Química, Universidade Federal de Minas Gerais, Avenida Presidente Antônio Carlos 6627, Pampulha, Belo Horizonte-MG, 31270-901, Brazil
| | - Diogo M Vidal
- Departamento de Química, Universidade Federal de Minas Gerais, Avenida Presidente Antônio Carlos 6627, Pampulha, Belo Horizonte-MG, 31270-901, Brazil
| | - Túlio R Freitas
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Farmácia, Universidade Federal de Minas Gerais, Avenida Presidente Antônio Carlos 6627, Pampulha, Belo Horizonte-MG, 31270-901, Brazil
| | - Adriano de P Sabino
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Farmácia, Universidade Federal de Minas Gerais, Avenida Presidente Antônio Carlos 6627, Pampulha, Belo Horizonte-MG, 31270-901, Brazil
| | - Lucienir P Duarte
- Departamento de Química, Universidade Federal de Minas Gerais, Avenida Presidente Antônio Carlos 6627, Pampulha, Belo Horizonte-MG, 31270-901, Brazil
| | - Grasiely F de Sousa
- Departamento de Química, Universidade Federal de Minas Gerais, Avenida Presidente Antônio Carlos 6627, Pampulha, Belo Horizonte-MG, 31270-901, Brazil
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2
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Castelli R, Taranto S, Furiassi L, Bozza N, Marseglia G, Ferlenghi F, Rivara S, Retini M, Bedini A, Spadoni G, Matarazzo S, Ronca R, Presta M, Mor M, Giacomini A. Chemical modification of NSC12 leads to a specific FGF-trap with antitumor activity in multiple myeloma. Eur J Med Chem 2021; 221:113529. [PMID: 34004471 DOI: 10.1016/j.ejmech.2021.113529] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Revised: 04/27/2021] [Accepted: 04/30/2021] [Indexed: 02/07/2023]
Abstract
Inhibition of FGF/FGFR signaling is a promising strategy for the treatment of malignances dependent from FGF stimulation, including multiple myeloma (MM). The steroidal derivative NSC12 (compound 1) is a pan-FGF trap endowed with antitumor activity in vivo. Chemical modifications of compound 1 were explored to investigate structure-activity relationships, focusing on the role of the bis(trifluoromethyl)1,3-propanediol chain, the stereochemistry at C20 and functionalization of C3 position. Our studies unveiled compound 25b, the pregnane 3-keto 20R derivative of compound 1 as an effective agent, blocking the proliferation of MM cells in vitro by inhibiting FGF-dependent receptor activation and slowing MM growth in vivo. Importantly, the absence of the hydroxyl group at C3 prevents binding to estrogen receptors, which might concur to the antitumor activity observed for compound 1, leading to a specific FGF/FGFR system inhibitor, and further supporting the role of FGFR in anticancer therapy in MM.
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Affiliation(s)
- Riccardo Castelli
- Dipartimento di Scienze degli Alimenti e del Farmaco, Università degli Studi di Parma, Parco Area delle Scienze 27/A, I-43124, Parma, Italy
| | - Sara Taranto
- Dipartimento di Medicina Molecolare e Traslazionale, Università degli Studi di Brescia, via Branze 39, I-25123, Brescia, Italy
| | - Lucia Furiassi
- Dipartimento di Scienze Biomolecolari, Università, degli Studi di Urbino "Carlo Bo", Piazza Rinascimento 6, I-61029, Urbino, Italy
| | - Nicole Bozza
- Dipartimento di Scienze degli Alimenti e del Farmaco, Università degli Studi di Parma, Parco Area delle Scienze 27/A, I-43124, Parma, Italy
| | - Giuseppe Marseglia
- Dipartimento di Scienze degli Alimenti e del Farmaco, Università degli Studi di Parma, Parco Area delle Scienze 27/A, I-43124, Parma, Italy
| | - Francesca Ferlenghi
- Dipartimento di Scienze degli Alimenti e del Farmaco, Università degli Studi di Parma, Parco Area delle Scienze 27/A, I-43124, Parma, Italy
| | - Silvia Rivara
- Dipartimento di Scienze degli Alimenti e del Farmaco, Università degli Studi di Parma, Parco Area delle Scienze 27/A, I-43124, Parma, Italy.
| | - Michele Retini
- Dipartimento di Scienze Biomolecolari, Università, degli Studi di Urbino "Carlo Bo", Piazza Rinascimento 6, I-61029, Urbino, Italy
| | - Annalida Bedini
- Dipartimento di Scienze Biomolecolari, Università, degli Studi di Urbino "Carlo Bo", Piazza Rinascimento 6, I-61029, Urbino, Italy
| | - Gilberto Spadoni
- Dipartimento di Scienze Biomolecolari, Università, degli Studi di Urbino "Carlo Bo", Piazza Rinascimento 6, I-61029, Urbino, Italy
| | - Sara Matarazzo
- Dipartimento di Medicina Molecolare e Traslazionale, Università degli Studi di Brescia, via Branze 39, I-25123, Brescia, Italy
| | - Roberto Ronca
- Dipartimento di Medicina Molecolare e Traslazionale, Università degli Studi di Brescia, via Branze 39, I-25123, Brescia, Italy
| | - Marco Presta
- Dipartimento di Medicina Molecolare e Traslazionale, Università degli Studi di Brescia, via Branze 39, I-25123, Brescia, Italy
| | - Marco Mor
- Dipartimento di Scienze degli Alimenti e del Farmaco, Università degli Studi di Parma, Parco Area delle Scienze 27/A, I-43124, Parma, Italy
| | - Arianna Giacomini
- Dipartimento di Medicina Molecolare e Traslazionale, Università degli Studi di Brescia, via Branze 39, I-25123, Brescia, Italy
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3
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Hamagami H, Yamaguchi Y, Tanaka H. Chemical Synthesis of Residue-Selectively 13C and 2H Double-Isotope-Labeled Oligosaccharides as Chemical Probes for the NMR-Based Conformational Analysis of Oligosaccharides. J Org Chem 2020; 85:16115-16127. [PMID: 33107296 DOI: 10.1021/acs.joc.0c01939] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The conformational analysis of oligosaccharide is a fundamental issue in glycobiology. NMR measurements of atom-selectively 13C-labeled oligosaccharides have provided valuable information concerning their conformation, which would not be possible using nonlabeled oligosaccharides. The amount of accessible information from an atom-selectively labeled molecule, however, is limited. In this work, we report on the chemical synthesis of residue-selectively 13C- and 2H-labeled oligosaccharides and their use in conformational analysis. 1H NMR measurements of such double isotope-labeled compounds can provide a great deal of information on the dihedral angles across glycosidic linkages. We demonstrated this method in the conformational analyses of some linear and branched β(1,3)-glucan oligosaccharides.
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Affiliation(s)
- Hiroki Hamagami
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1-H101 Ookayama, Meguro, Tokyo 152-8552, Japan
| | - Yoshiki Yamaguchi
- RIKEN-Max-Planck Joint Research Center for Systems Chemical Biology RIKEN Global Research Cluster, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Hiroshi Tanaka
- Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1-H101 Ookayama, Meguro, Tokyo 152-8552, Japan
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4
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Foamy matters: an update on Quillaja saponins and their use as immunoadjuvants. Future Med Chem 2019; 11:1485-1499. [DOI: 10.4155/fmc-2018-0438] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Immunoadjuvant Quillaja spp. tree saponins stimulate both cellular and humoral responses, significantly widening vaccine target pathogen spectra. Host toxicity of specific saponins, fractions and extracts may be rather low and further reduced using lipid-based delivery systems. Saponins contain a hydrophobic central aglycone decorated with several sugar residues, posing a challenge for viable chemical synthesis. These, however, may provide simpler analogs. Saponin chemistry affords characteristic interactions with cell membranes, which are essential for its mechanism of action. Natural sources include Quillaja saponaria barks and, more recently, Quillaja brasiliensis leaves. Sustainable large-scale supply can use young plants grown in clonal gardens and elicitation treatments. Quillaja genomic studies will most likely buttress future synthetic biology-based saponin production efforts.
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Sarkar V, Mukhopadhyay B. Synthesis of the tetrasaccharide related to the repeating unit of the O-antigen from Azospirillum brasilense Jm125A2 in the form of its 2-aminoethyl glycoside. Carbohydr Res 2018; 470:13-18. [PMID: 30292926 DOI: 10.1016/j.carres.2018.09.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Revised: 09/26/2018] [Accepted: 09/26/2018] [Indexed: 01/11/2023]
Abstract
Total chemical synthesis of the linear tetrasaccharide repeating unit β-D-Glc-(1 → 2)-α-L-Rha-(1 → 3)-α-L-Rha-(1 → 2)-α-L-Rha-CH2CH2NH2 of the O-antigen from Azospirillum brasilense Jm125A2 is accomplished through rational protecting group manipulations of commercially available monosaccharides and stereoselective glycosylations. The target tetrasaccharide in the form of its 2-aminoethyl glycoside is obtained in ∼24% yield over 10 steps following a linear strategy. The structure is particularly suitable for further glycoconjugate formation through the terminal free amine without hampering the reducing end stereochemistry.
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Affiliation(s)
- Vikramjit Sarkar
- Sweet Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, Nadia, 741246, India
| | - Balaram Mukhopadhyay
- Sweet Lab, Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata, Mohanpur, Nadia, 741246, India.
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6
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Greatrex BW, Daines AM, Hook S, Lenz DH, McBurney W, Rades T, Rendle PM. Synthesis, Formulation, and Adjuvanticity of Monodesmosidic Saponins with Olenanolic Acid, Hederagenin and Gypsogenin Aglycones, and some C-28 Ester Derivatives. ChemistryOpen 2015; 4:740-55. [PMID: 27308200 PMCID: PMC4906508 DOI: 10.1002/open.201500149] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Revised: 08/20/2015] [Indexed: 11/06/2022] Open
Abstract
In an attempt to discover a new synthetic vaccine adjuvant, the glycosylation of hederagenin, gypsogenin, and oleanolic acid acceptors with di- and trisaccharide donors to generate a range of mimics of natural product QS-21 was carried out. The saponins were formulated with phosphatidylcholine and cholesterol, and the structures analyzed by transmission electron microscopy. 3-O-(Manp(1→3)Glcp)hederagenin was found to produce numerous ring-like micelles when formulated, while C-28 choline ester derivatives preferred self-assembly and did not interact with the liposomes. When alone and in the presence of cholesterol and phospholipid, the choline ester derivatives produced nanocrystalline rods or helical micelles. The effects of modifying sugar stereochemistry and the aglycone on the immunostimulatory effects of the saponins was then evaluated using the activation markers MHC class II and CD86 in murine bone marrow dendritic cells. The most active saponin, 3-O-(Manp(1→3)Glcp)hederagenin, was stimulatory at high concentrations in cell culture, but this did not translate to strong responses in vivo.
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Affiliation(s)
- Ben W. Greatrex
- Ferrier Research InstituteVictoria University of WellingtonGracefield RdLower Hutt5010New Zealand
- School of Science & TechnologyUniversity of New EnglandArmidaleNSW2351Australia
| | - Alison M. Daines
- Ferrier Research InstituteVictoria University of WellingtonGracefield RdLower Hutt5010New Zealand
| | - Sarah Hook
- School of PharmacyUniversity of OtagoDunedin9016New Zealand
| | - Dirk H. Lenz
- Ferrier Research InstituteVictoria University of WellingtonGracefield RdLower Hutt5010New Zealand
| | | | - Thomas Rades
- School of PharmacyUniversity of OtagoDunedin9016New Zealand
| | - Phillip M. Rendle
- Ferrier Research InstituteVictoria University of WellingtonGracefield RdLower Hutt5010New Zealand
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7
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Aly MRES, Saad HA, Abdel-Hafez SH. Synthesis, antimicrobial and cytotoxicity evaluation of new cholesterol congeners. Beilstein J Org Chem 2015; 11:1922-32. [PMID: 26664612 PMCID: PMC4661006 DOI: 10.3762/bjoc.11.208] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Accepted: 09/28/2015] [Indexed: 12/30/2022] Open
Abstract
3β-Azidocholest-5-ene (3) and (3β)-3-(prop-2-yn-1-yloxy)cholest-5-ene (10) were prepared as substrates to synthesize a variety of three-motif pharmacophoric conjugates through CuAAC. Basically, these conjugates included cholesterol and 1,2,3-triazole moieties, while the third, the pharmacophore, was either a chalcone, a lipophilic residue or a carbohydrate tag. These compounds were successfully prepared in good yields and characterized by NMR, MS and IR spectroscopic techniques. Chalcone conjugate 6c showed the best antimicrobial activity, while the lactoside conjugate 27 showed the best cytotoxic effect in vitro.
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Affiliation(s)
- Mohamed Ramadan El Sayed Aly
- Chemistry Department, Faculty of Science, Taif University, 21974-Hawyah-Taif, Kingdom of Saudi Arabia
- Chemistry Department, Faculty of Applied Science, Port Said University, 42522-Port Said, Egypt
| | - Hosam Ali Saad
- Chemistry Department, Faculty of Science, Taif University, 21974-Hawyah-Taif, Kingdom of Saudi Arabia
- Chemistry Department, Faculty of Science, Zagazig University, Zagazig, 44511, Egypt
| | - Shams Hashim Abdel-Hafez
- Chemistry Department, Faculty of Science, Taif University, 21974-Hawyah-Taif, Kingdom of Saudi Arabia
- Chemistry Department, Faculty of Science, Assuit University, 71516-Assuit, Egypt
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8
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Aly MRES, Saad HA, Mohamed MAM. Click reaction based synthesis, antimicrobial, and cytotoxic activities of new 1,2,3-triazoles. Bioorg Med Chem Lett 2015; 25:2824-30. [DOI: 10.1016/j.bmcl.2015.04.096] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 04/25/2015] [Accepted: 04/30/2015] [Indexed: 10/23/2022]
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9
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Feng S, Li C. Stereospecific, High-Yielding, and Green Synthesis of β-Glycosyl Esters. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:5732-9. [PMID: 26042825 DOI: 10.1021/acs.jafc.5b02534] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A new method of synthesizing β-glycosyl esters stereospecifically has been developed by treating O-benzyl-protected glycosyl chlorides with Cs2CO3, tetrabutylammomium bromide (TBAB), a carboxylic acid, water, and granular polytetrafluoroethylene (PTFE) at 80 °C under mechanical agitation. D-Glucosyl, D-xylosyl, and D-galactosyl chlorides and 20 carboxylic acids were used to demonstrate the scope of the reaction. Control experiments showed that the water and granular PTFE had indispensable roles. Water-soluble TBAB has been found to be as efficient as N-methyl-N,N,N-trioctyloctan-1-ammonium chloride (Aliquat 336) in the reactions. After scaling up to 5-12 g, all of the products were obtained quantitatively via simple filtration and no organic solvents or chromatography was needed for the entire process.
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Affiliation(s)
- Suliu Feng
- Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China
| | - Chunbao Li
- Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, China
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10
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Chen YB, Wang SI, Lin ZP, Lin CH, Hsieh MT, Lin HC. Stereoselective glycosylation of d-galactals by diethyl phosphorochloridite- and AlCl3-assisted Ferrier rearrangement. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.11.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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Alberti D, Toppino A, Geninatti Crich S, Meraldi C, Prandi C, Protti N, Bortolussi S, Altieri S, Aime S, Deagostino A. Synthesis of a carborane-containing cholesterol derivative and evaluation as a potential dual agent for MRI/BNCT applications. Org Biomol Chem 2014; 12:2457-67. [PMID: 24604345 DOI: 10.1039/c3ob42414f] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In this study the synthesis and characterization of a new dual, imaging and therapeutic, agent is proposed with the aim of improving the efficacy of Boron Neutron Capture Therapy (BNCT) in cancer treatment. The agent (Gd-B-AC01) consists of a carborane unit (ten boron atoms) bearing a cholesterol unit on one side (to pursue the incorporation into the liposome bi-layer) and a Gd(iii)/1,4,7,10-tetraazacyclododecane monoamide complex on the other side (as a MRI reporter to attain the quantification of the B/Gd concentration). In order to endow the BNCT agent with specific delivery properties, the liposome embedded with the MRI/BNCT dual probes has been functionalized with a pegylated phospholipid containing a folic acid residue at the end of the PEG chain. The vector allows the binding of the liposome to folate receptors that are overexpressed in many tumor types, and in particular, in human ovarian cancer cells (IGROV-1). An in vitro test on IGROV-1 cells demonstrated that Gd-B-AC01 loaded liposomes are efficient carriers for the delivery of the MRI/BNCT probes to the tumor cells. Finally, the BNCT treatment of IGROV-1 cells showed that the number of surviving cells was markedly smaller when the cells were irradiated after internalization of the folate-targeted GdB10-AC01/liposomes.
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Affiliation(s)
- Diego Alberti
- Department of Molecular Biotechnology and Health Sciences, University of Torino, via Nizza 52, 10126, Torino, Italy.
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Abstract
An efficient total synthesis of rhodexin A (1) is reported. An initial inverse-electron-demand Diels-Alder reaction of the acyldiene 6 with the silyl enol ether 7 gave the cycloadduct 8 with the required 4 contiguous stereocenters in a single step. This compound was then transformed into the tetracyclic enone 16, which was converted to rhodexin A (1).
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Affiliation(s)
- Michael E Jung
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095, United States.
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13
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Harvey DJ. Analysis of carbohydrates and glycoconjugates by matrix-assisted laser desorption/ionization mass spectrometry: an update for the period 2005-2006. MASS SPECTROMETRY REVIEWS 2011; 30:1-100. [PMID: 20222147 DOI: 10.1002/mas.20265] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This review is the fourth update of the original review, published in 1999, on the application of MALDI mass spectrometry to the analysis of carbohydrates and glycoconjugates and brings coverage of the literature to the end of 2006. The review covers fundamental studies, fragmentation of carbohydrate ions, method developments, and applications of the technique to the analysis of different types of carbohydrate. Specific compound classes that are covered include carbohydrate polymers from plants, N- and O-linked glycans from glycoproteins, glycated proteins, glycolipids from bacteria, glycosides, and various other natural products. There is a short section on the use of MALDI-TOF mass spectrometry for the study of enzymes involved in glycan processing, a section on industrial processes, particularly the development of biopharmaceuticals and a section on the use of MALDI-MS to monitor products of chemical synthesis of carbohydrates. Large carbohydrate-protein complexes and glycodendrimers are highlighted in this final section.
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Affiliation(s)
- David J Harvey
- Department of Biochemistry, Oxford Glycobiology Institute, University of Oxford, Oxford OX1 3QU, UK.
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14
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Gauthier C, Legault J, Lavoie S, Rondeau S, Tremblay S, Pichette A. Synthesis of two natural betulinic acid saponins containing α-l-rhamnopyranosyl-(1→2)-α-l-arabinopyranose and their analogues. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.05.029] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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15
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Li Y, Tang P, Chen Y, Yu B. Gold(I)-Catalyzed Glycosidation of 1,2-Anhydrosugars. J Org Chem 2008; 73:4323-5. [DOI: 10.1021/jo8003875] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yao Li
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Pingping Tang
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Youxi Chen
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Biao Yu
- State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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16
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Passos Eleutério MI, Schimmel J, Ritter G, do Céu Costa M, Schmidt RR. Synthesis of Saponins with Allobetulin and Glycyrrhetic Acid as Aglycones. European J Org Chem 2006. [DOI: 10.1002/ejoc.200600565] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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