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Bouton J, Furquim d'Almeida A, Maes L, Caljon G, Van Calenbergh S, Hulpia F. Synthesis and evaluation of 3'-fluorinated 7-deazapurine nucleosides as antikinetoplastid agents. Eur J Med Chem 2021; 216:113290. [PMID: 33667845 DOI: 10.1016/j.ejmech.2021.113290] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 01/26/2021] [Accepted: 02/08/2021] [Indexed: 01/05/2023]
Abstract
Kinetoplastid parasites are the causative agents of neglected tropical diseases with an unmet medical need. These parasites are unable to synthesize the purine ring de novo, and therefore rely on purine salvage to meet their purine demand. Evaluating purine nucleoside analogs is therefore an attractive strategy to identify antikinetoplastid agents. Several anti-Trypanosoma cruzi and anti-Trypanosoma brucei 7-deazapurine nucleosides were previously discovered, with the removal of the 3'-hydroxyl group resulting in a significant boost in activity. In this work we therefore decided to assess the effect of the introduction of a 3'-fluoro substituent in 7-deazapurine nucleosides on the anti-kinetoplastid activities. Hence, we synthesized two series of 3'-deoxy-3'-fluororibofuranosyl and 3'-deoxy-3'-fluoroxylofuranosyl nucleosides comprising 7-deazaadenine and -hypoxanthine bases and assayed these for antiparasitic activity. Several analogs with potent activity against T. cruzi and T. brucei were discovered, indicating that a fluorine atom in the 3'-position is a promising modification for the discovery of antiparasitic nucleosides.
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Affiliation(s)
- Jakob Bouton
- Laboratory for Medicinal Chemistry (Campus Heymans), Ghent University, Ottergemsesteenweg 460, B-9000, Gent, Belgium
| | - Arno Furquim d'Almeida
- Laboratory for Medicinal Chemistry (Campus Heymans), Ghent University, Ottergemsesteenweg 460, B-9000, Gent, Belgium
| | - Louis Maes
- Laboratory of Microbiology, Parasitology and Hygiene, University of Antwerp, Universiteitsplein 1 (S7), B-2610, Wilrijk, Belgium
| | - Guy Caljon
- Laboratory of Microbiology, Parasitology and Hygiene, University of Antwerp, Universiteitsplein 1 (S7), B-2610, Wilrijk, Belgium
| | - Serge Van Calenbergh
- Laboratory for Medicinal Chemistry (Campus Heymans), Ghent University, Ottergemsesteenweg 460, B-9000, Gent, Belgium.
| | - Fabian Hulpia
- Laboratory for Medicinal Chemistry (Campus Heymans), Ghent University, Ottergemsesteenweg 460, B-9000, Gent, Belgium
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2
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Dasari M, Ma P, Pelly SC, Sharma SK, Liotta DC. Synthesis and biological evaluation of 5'-C-methyl nucleotide prodrugs for treating HCV infections. Bioorg Med Chem Lett 2020; 30:127539. [PMID: 32919013 DOI: 10.1016/j.bmcl.2020.127539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 08/31/2020] [Accepted: 09/02/2020] [Indexed: 10/23/2022]
Abstract
Nucleotide prodrugs are of great clinical interest for treating a variety of viral infections due to their ability to target tissues selectively and to deliver relatively high concentrations of the active nucleotide metabolite intracellularly. However, their clinical successes have been limited, oftentimes due to unwanted in vivo metabolic processes that reduce the quantities of nucleoside triphosphate that reach the site of action. In an attempt to circumvent this, we designed novel nucleosides that incorporate a sterically bulky group at the 5'-carbon of the phosphoester prodrug, which we reasoned would reduce the amounts of non-productive PO bond cleavage back to the corresponding nucleoside by nucleotidases. Molecular docking studies with the NS5B HCV polymerase suggested that a nucleotide containing a 5'-methyl group could be accommodated. Therefore, we synthesized mono- and diphosphate prodrugs of 2',5'-C-dimethyluridine stereoselectively and evaluated their cytotoxicity and anti-HCV activity in the HCV replicon assay. All four prodrugs exhibited anti-HCV activity with IC50 values in the single digit micromolar concentrations, with the 5'(R)-C-methyl prodrug displaying superior potency relative to its 5'(S)-C-methyl counterpart. However, when compared to the unmethylated prodrug, the potency is poorer. The poorer potency of these prodrugs may be due to unfavorable steric interactions of the 5'-C-methyl group in the active sites of the kinases that catalyze the formation of active triphosphate metabolite.
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Affiliation(s)
- Madhuri Dasari
- Department of Chemistry, Emory University, 1521 Dickey Drive NE, Atlanta, GA 30322, United States
| | - Peipei Ma
- Department of Chemistry, Emory University, 1521 Dickey Drive NE, Atlanta, GA 30322, United States
| | - Stephen C Pelly
- Department of Chemistry, Emory University, 1521 Dickey Drive NE, Atlanta, GA 30322, United States
| | - Savita K Sharma
- Department of Chemistry, Emory University, 1521 Dickey Drive NE, Atlanta, GA 30322, United States
| | - Dennis C Liotta
- Department of Chemistry, Emory University, 1521 Dickey Drive NE, Atlanta, GA 30322, United States.
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3
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4
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Ferraboschi P, Ciceri S, Grisenti P. Synthesis of Antitumor Fluorinated Pyrimidine Nucleosides. ORG PREP PROCED INT 2017. [DOI: 10.1080/00304948.2017.1290994] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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5
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Mirabella S, Fibbi G, Matassini C, Faggi C, Goti A, Cardona F. Accessing 2-substituted piperidine iminosugars by organometallic addition/intramolecular reductive amination: aldehyde vs. nitrone route. Org Biomol Chem 2017; 15:9121-9126. [DOI: 10.1039/c7ob01848g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A novel dual strategy to build 2-substituted trihydroxypiperidines.
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Affiliation(s)
- S. Mirabella
- Department of Chemistry “Ugo Schiff”
- University of Firenze
- 50019 Sesto Fiorentino (FI)
- Italy
| | - G. Fibbi
- Department of Chemistry “Ugo Schiff”
- University of Firenze
- 50019 Sesto Fiorentino (FI)
- Italy
| | - C. Matassini
- Department of Chemistry “Ugo Schiff”
- University of Firenze
- 50019 Sesto Fiorentino (FI)
- Italy
- Associated with CNR-INO
| | - C. Faggi
- Department of Chemistry “Ugo Schiff”
- University of Firenze
- 50019 Sesto Fiorentino (FI)
- Italy
| | - A. Goti
- Department of Chemistry “Ugo Schiff”
- University of Firenze
- 50019 Sesto Fiorentino (FI)
- Italy
- Associated with CNR-INO
| | - F. Cardona
- Department of Chemistry “Ugo Schiff”
- University of Firenze
- 50019 Sesto Fiorentino (FI)
- Italy
- Associated with CNR-INO
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6
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Mekala N, Moturu MVRK, Dammalapati RVLN, Parimi AR. Safe and Alternate Process for the Reductions of Methanesulfonates: Application in the Synthesis of 1,2,3-Triacetyl-5-deoxy-d-ribofuranoside. Org Process Res Dev 2016. [DOI: 10.1021/acs.oprd.5b00286] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nagaraju Mekala
- Oncology Division,
Process Development Laboratories, Laurus Laboratories Private Limited, ICICI Knowledge Park, Turkapally,
Shameerpet, Hyderabad-500 078, Telangana, India
- Department of Organic Chemistry, Food, Drugs & Water, School of Chemistry, Andhra University, Visakhapatnam-530 003, Andhra Pradesh, India
| | - Murthy V. R. K. Moturu
- Oncology Division,
Process Development Laboratories, Laurus Laboratories Private Limited, ICICI Knowledge Park, Turkapally,
Shameerpet, Hyderabad-500 078, Telangana, India
| | - Rao V. L. N. Dammalapati
- Oncology Division,
Process Development Laboratories, Laurus Laboratories Private Limited, ICICI Knowledge Park, Turkapally,
Shameerpet, Hyderabad-500 078, Telangana, India
| | - Atchuta R. Parimi
- Department of Organic Chemistry, Food, Drugs & Water, School of Chemistry, Andhra University, Visakhapatnam-530 003, Andhra Pradesh, India
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7
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Hassan AEA, Abou-Elkhair RAI, Parker WB, Allan PW, Secrist JA. 6-Methylpurine derived sugar modified nucleosides: Synthesis and evaluation of their substrate activity with purine nucleoside phosphorylases. Bioorg Chem 2015; 65:9-16. [PMID: 26745284 DOI: 10.1016/j.bioorg.2015.12.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2015] [Revised: 12/22/2015] [Accepted: 12/23/2015] [Indexed: 01/10/2023]
Abstract
6-Methylpurine (MeP) is cytotoxic adenine analog that does not exhibit selectivity when administered systemically, and could be very useful in a gene therapy approach to cancer treatment involving Escherichia coli PNP. The prototype MeP releasing prodrug, 9-(β-d-ribofuranosyl)-6-methylpurine, MeP-dR has demonstrated good activity against tumors expressing E. coli PNP, but its antitumor activity is limited due to toxicity resulting from the generation of MeP from gut bacteria. Therefore, we have embarked on a medicinal chemistry program to identify non-toxic MeP prodrugs that could be used in conjunction with E. coli PNP. In this work, we report on the synthesis of 9-(6-deoxy-β-d-allofuranosyl)-6-methylpurine (3) and 9-(6-deoxy-5-C-methyl-β-d-ribo-hexofuranosyl)-6-methylpurine (4), and the evaluation of their substrate activity with several phosphorylases. The glycosyl donors; 1,2-di-O-acetyl-3,5-di-O-benzyl-α-d-allofuranose (10) and 1-O-acetyl-3-O-benzyl-2,5-di-O-benzoyl-6-deoxy-5-C-methyl-β-d-ribohexofuran-ose (15) were prepared from 1,2:5,6-di-O-isopropylidine-α-d-glucofuranose in 9 and 11 steps, respectively. Coupling of 10 and 15 with silylated 6-methylpurine under Vorbrüggen glycosylation conditions followed conventional deprotection of the hydroxyl groups furnished 5'-C-methylated-6-methylpurine nucleosides 3 and 4, respectively. Unlike 9-(6-deoxy-α-l-talo-furanosyl)-6-methylpurine, which showed good substrate activity with E. coli PNP mutant (M64V), the β-d-allo-furanosyl derivative 3 and the 5'-di-C-methyl derivative 4 were poor substrates for all tested glycosidic bond cleavage enzymes.
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Affiliation(s)
- Abdalla E A Hassan
- Southern Research Institute, P.O. Box 55305, Birmingham, AL 35255-5305, USA; Applied Nucleic Acids Research Center, Zagazig University, Egypt.
| | | | - William B Parker
- Southern Research Institute, P.O. Box 55305, Birmingham, AL 35255-5305, USA; PNP Therapeutics Inc., 15 Richard Arrington Jr. Blvd North, Birmingham, AL 35203, USA
| | - Paula W Allan
- Southern Research Institute, P.O. Box 55305, Birmingham, AL 35255-5305, USA
| | - John A Secrist
- Southern Research Institute, P.O. Box 55305, Birmingham, AL 35255-5305, USA
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8
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De Coen LM, Heugebaert TSA, García D, Stevens CV. Synthetic Entries to and Biological Activity of Pyrrolopyrimidines. Chem Rev 2015; 116:80-139. [DOI: 10.1021/acs.chemrev.5b00483] [Citation(s) in RCA: 109] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Laurens M. De Coen
- Department of Sustainable
Organic Chemistry and Technology, Ghent University, Coupure links
653, B-9000 Ghent, Belgium
| | - Thomas S. A. Heugebaert
- Department of Sustainable
Organic Chemistry and Technology, Ghent University, Coupure links
653, B-9000 Ghent, Belgium
| | - Daniel García
- Department of Sustainable
Organic Chemistry and Technology, Ghent University, Coupure links
653, B-9000 Ghent, Belgium
| | - Christian V. Stevens
- Department of Sustainable
Organic Chemistry and Technology, Ghent University, Coupure links
653, B-9000 Ghent, Belgium
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9
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Nauš P, Caletková O, Perlíková P, Poštová Slavětínská L, Tloušťová E, Hodek J, Weber J, Džubák P, Hajdúch M, Hocek M. Synthesis and biological profiling of 6- or 7-(het)aryl-7-deazapurine 4'-C-methylribonucleosides. Bioorg Med Chem 2015; 23:7422-38. [PMID: 26558518 DOI: 10.1016/j.bmc.2015.10.040] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 10/25/2015] [Accepted: 10/28/2015] [Indexed: 11/28/2022]
Abstract
The synthesis and biological activity profiling of a large series of diverse pyrrolo[2,3-d]pyrimidine 4'-C-methylribonucleosides bearing an (het)aryl group at position 4 or 5 is reported as well as the synthesis of several phosphoramidate prodrugs. These compounds are 4'-C-methyl derivatives of previously reported cytostatic hetaryl-7-deazapurine ribonucleosides. The synthesis is based on glycosylation of halogenated 7-deazapurine bases with 1,2-di-O-acetyl-3,5-di-O-benzyl-4-C-methyl-β-d-ribofuranose followed by cross-coupling and nucleophilic substitution reactions. The final compounds showed low cytotoxicity and several derivatives exerted antiviral activity against HCV or Dengue viruses at micromolar concentrations.
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Affiliation(s)
- Petr Nauš
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic
| | - Olga Caletková
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic
| | - Pavla Perlíková
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic
| | - Lenka Poštová Slavětínská
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic
| | - Eva Tloušťová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic
| | - Jan Hodek
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic
| | - Jan Weber
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic
| | - Petr Džubák
- Institute of Molecular and Translational Medicine, Palacky University and University Hospital in Olomouc, Faculty of Medicine and Dentistry, Hněvotínská 5, 77515 Olomouc, Czech Republic
| | - Marián Hajdúch
- Institute of Molecular and Translational Medicine, Palacky University and University Hospital in Olomouc, Faculty of Medicine and Dentistry, Hněvotínská 5, 77515 Olomouc, Czech Republic
| | - Michal Hocek
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Gilead Sciences & IOCB Research Center, Flemingovo nam. 2, CZ-16610 Prague 6, Czech Republic; Department of Organic and Nuclear Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, CZ-12843 Prague 2, Czech Republic.
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10
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Kirschberg TA, Mish M, Squires NH, Zonte S, Aktoudianakis E, Metobo S, Butler T, Ju X, Cho A, Ray AS, Kim CU. Synthesis of 1'-C-cyano pyrimidine nucleosides and characterization as HCV polymerase inhibitors. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2015; 34:763-85. [PMID: 26398773 DOI: 10.1080/15257770.2015.1075550] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Ribose modified 1'-C-cyano pyrimidine nucleosides were synthesized. A silver triflate mediated Vorbrüggen reaction was used to generate the nucleoside scaffold and follow-up chemistry provided specific ribose modified analogs. Nucleosides and phosphoramidate prodrugs were tested for their anti-HCV activity.
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Affiliation(s)
| | - Michael Mish
- a Medicinal Chemistry, Gilead Sciences , Foster City , CA , USA
| | - Neil H Squires
- a Medicinal Chemistry, Gilead Sciences , Foster City , CA , USA
| | - Sebastian Zonte
- a Medicinal Chemistry, Gilead Sciences , Foster City , CA , USA
| | | | - Sammy Metobo
- a Medicinal Chemistry, Gilead Sciences , Foster City , CA , USA
| | - Thomas Butler
- a Medicinal Chemistry, Gilead Sciences , Foster City , CA , USA
| | - Xie Ju
- a Medicinal Chemistry, Gilead Sciences , Foster City , CA , USA
| | - Aesop Cho
- a Medicinal Chemistry, Gilead Sciences , Foster City , CA , USA
| | - Adrian S Ray
- a Medicinal Chemistry, Gilead Sciences , Foster City , CA , USA
| | - Choung U Kim
- b Kainos Medicine, Inc. , Seoul , Republic of Korea
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11
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Microwave-Assisted FeCl 3·6H 2O-Catalyzed Regioselective Deprotection of Pyranose Anomeric O-Acetyl Group. ACTA ACUST UNITED AC 2013. [DOI: 10.4028/www.scientific.net/amr.830.155] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Treatment of peracetylated pyranoses with FeCl3·6H2O in acetonitrile under microwave conditions provides an efficient and mild method for regioselective deprotection of anomeric O-acetyl group. The experimental results indicated that the employment of microwave could notably improve the reaction efficacy compared with the conventional heating condition.
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12
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Zhou L, Amblard F, Zhang H, McBrayer TR, Detorio MA, Whitaker T, Coats SJ, Schinazi RF. Synthesis and evaluation of Janus type nucleosides as potential HCV NS5B polymerase inhibitors. Bioorg Med Chem Lett 2013; 23:3385-8. [PMID: 23623492 PMCID: PMC3704321 DOI: 10.1016/j.bmcl.2013.03.077] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Revised: 03/14/2013] [Accepted: 03/20/2013] [Indexed: 10/27/2022]
Abstract
The synthesis of new ribo and 2'-β-C-methyl ribo Janus type nucleosides J-AA, J-AG and J-AU is reported along with their ability to block HCV and HIV replication. Their toxicity was also assessed in Huh7, human lymphocytes, CEM and Vero cells.
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Affiliation(s)
- Longhu Zhou
- Center for AIDS Research, Laboratory of Biochemical Pharmacology, Department of Pediatrics, Emory University School of Medicine, and Veterans Affairs Medical Center, Decatur, GA 30033, USA
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Dhuguru J, Gheewala C, Kumar NSS, Wilson JN. Highly Chromic, Proton-Responsive Phenyl Pyrimidones. Org Lett 2011; 13:4188-91. [DOI: 10.1021/ol2014945] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Jyothi Dhuguru
- Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33124, United States
| | - Chirag Gheewala
- Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33124, United States
| | - N. S. Saleesh Kumar
- Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33124, United States
| | - James N. Wilson
- Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, Florida 33124, United States
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14
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Seela F, Peng X. Pyrrolo[2,3-d]pyrimidine β-L-Nucleosides Containing 7-Deazaadenine, 2-Amino-7-deazaadenine, 7-Deazaguanine, 7-Deazaisoguanine, and 7-Deazaxanthine. ACTA ACUST UNITED AC 2006. [DOI: 10.1135/cccc20060956] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The synthesis and properties of 7-deazapurine β-L-nucleosides are described. The stereoselective glycosylation of the anions of 2-amino-6-chloro-7-deazapurines 9a, 9b or 6-chloro-7-deazapurines 13a, 13d with 3,5-di-O-(4-methylbenzoyl)-2-deoxy-α-L-erythro-pentofuranosyl chloride (8) furnished the β-L-2'-deoxyribonucleosides 1-4. The synthesis of β-L-ribonucleosides 5-7 used the Silyl-Hilbert-Johnson reaction (TMSOTf/BSA/MeCN) performed under Vorbrüggen conditions for the glycosylation of 7-halogenated 6-chloro-2-pivalamido-7-deazapurines 17b-17d with 1-O-acetyl-2,3,5-tri-O-benzoyl-L-ribofuranose (16). Single-crystal X-ray analyses were performed and CD spectra were measured to assign the configuration. The antiviral activity against selected DNA and RNA viruses is reported.
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15
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Gunic E, Girardet JL, Pietrzkowski Z, Esler C, Wang G. Synthesis and cytotoxicity of 4'-C- and 5'-C-substituted toyocamycins. Bioorg Med Chem 2001; 9:163-70. [PMID: 11197336 DOI: 10.1016/s0968-0896(00)00221-2] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Toyocamycin and some analogues have shown potent antitumor activities; however, none of them could be used clinically primarily owing to their cytotoxicity to normal human cells. In order to overcome the weakness of these nucleoside analogues, substitution of a variety of modified sugars for the ribofuranose was explored in our laboratories with expectation that certain sugar-modified toyocamycin analogues may be selectively cytotoxic to cancer cells. In this article, we report synthesis and cytotoxicity of 4'-C- and 5'-C-substituted toyocamycins, which were prepared via the condensations of 4-C- and 5-C-substituted ribofuranose derivatives 11, 12, 13, 20, 21, and 26 with the silylated form of 4-amino-6-bromo-5-cyanopyrrolo[2,3-]pyrimidine (27) and subsequent debromination and debenzoylation. When compared to the parent toyocamycin, all these analogues showed much lower cytotoxicity to human prostate cancer cells (HTB-81), mouse melanoma cancer cells (B16) as well as normal human fibroblasts. Compound 1e showed a significant cytotoxicity to the prostate cancer cells and a moderate selectivity. The results suggested that sugar modifications, especially those that may affect phosphorylation of nucleosides, could alter cytotoxicity profile significantly.
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Affiliation(s)
- E Gunic
- Chemistry Laboratories, ICN Phartmaceuticals. Inc., Costa Mesa, California 92626, USA
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16
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Hocek M, Holý A, Votruba I, Dvořáková H. Cytostatic 6-Arylpurine Nucleosides II. Synthesis of Sugar-Modified Derivatives: 9-(2-Deoxy-β-D-erythro-pentofuranosyl)-, 9-(5-Deoxy-β-D-ribofuranosyl)- and 9-(2,3-Dihydroxypropyl)-6-phenylpurines. ACTA ACUST UNITED AC 2000. [DOI: 10.1135/cccc20001683] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
9-(2-Deoxy-β-D-erythro-pentofuranosyl)-6-(4-substituted phenyl)purines, 9-(5-deoxy-β-D-ribofuranosyl)-6-(4-substituted phenyl)purines and 9-(2,3-dihydroxypropyl)-6-(4-substituted phenyl)purines were prepared by the Suzuki-Miyaura cross-coupling reactions of the corresponding protected 9-substituted 6-chloropurines with substituted phenylboronic acids followed by MeONa mediated deprotection. In contrast to the highly active 6-phenylpurine ribonucleosides, the title compounds did not show any considerable cytostatic activity.
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