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Krömer M, Brunderová M, Ivancová I, Poštová Slavětínská L, Hocek M. 2-Formyl-dATP as Substrate for Polymerase Synthesis of Reactive DNA Bearing an Aldehyde Group in the Minor Groove. Chempluschem 2021; 85:1164-1170. [PMID: 32496002 DOI: 10.1002/cplu.202000287] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 05/15/2020] [Indexed: 12/16/2022]
Abstract
2-Formyl-2'-deoxyadenosine triphosphate (dCHO ATP) was synthesized and tested as a substrate in enzymatic synthesis of DNA modified in the minor groove with a reactive aldehyde group. The multistep synthesis of dCHO ATP was based on the preparation of protected 2-dihydroxyethyl-2'-deoxyadenosine intemediate, which was triphosphorylated and converted to aldehyde through oxidative cleavage. The dCHO ATP triphosphate was a moderate substrate for KOD XL DNA polymerase, and was used for enzymatic synthesis of some sequences using primer extension (PEX). On the other hand, longer sequences (31-mer) with higher number of modifications, or sequences with modifications at adjacent positions did not give full extension. Single-nucleotide extension followed by PEX was used for site-specific incorporation of one aldehyde-linked adenosine into a longer 49-mer sequence. The reactive formyl group was used for cross-linking with peptides and proteins using reductive amination and for fluorescent labelling through oxime formation with an AlexaFluor647-linked hydroxylamine.
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Affiliation(s)
- Matouš Krömer
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo namesti 2, 16610, Prague 6, Czech Republic.,Department of Organic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, Prague-2, 12843, Czech Republic
| | - Mária Brunderová
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo namesti 2, 16610, Prague 6, Czech Republic.,Department of Organic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, Prague-2, 12843, Czech Republic
| | - Ivana Ivancová
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo namesti 2, 16610, Prague 6, Czech Republic.,Department of Organic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, Prague-2, 12843, Czech Republic
| | - Lenka Poštová Slavětínská
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo namesti 2, 16610, Prague 6, Czech Republic
| | - Michal Hocek
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo namesti 2, 16610, Prague 6, Czech Republic.,Department of Organic Chemistry, Faculty of Science, Charles University in Prague, Hlavova 8, Prague-2, 12843, Czech Republic
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2
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Taniguchi Y, Sagara I, Nagata Y, Kikukawa Y, Sasaki S. Effects of the 2-Substituted Adenosine-1,3-diazaphenoxazine 5'-Triphosphate Derivatives on the Single Nucleotide Primer Extension Reaction by DNA Polymerase. Chem Pharm Bull (Tokyo) 2019; 67:1123-1130. [PMID: 31582632 DOI: 10.1248/cpb.c19-00453] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The adenosine triphosphate derivatives of 2-oxo-1,3-diazaphenoxazine (dAdapTP) showed a significant discrimination ability for the template strand including that between 8-oxo-2'-deoxyguanosine (8-oxodG) and 2'-deoxyguanosine (dG) by the single nucleotide primer extension reaction using the Klenow Fragment. In this study, we synthesized new dAdapTP derivatives, i.e., 2-amino-dAdapTP, 2-chloro-dAdapTP and 2-iodo-dAdapTP, to investigate the effect on the selectivity and efficiency of incorporation for the primer extension reaction using a variety of DNA polymerases. In contrast to the previously tested dAdapTP, the selectivity and efficiency of the 2-halo-dAdapTP incorporation were dramatically decreased using the Klenow Fragment. Moreover, the efficiency of the 2-amino-dAdapTP incorporation into the T-containing template was almost the same with that of dAdapTP. In the case of the Bsu DNA polymerase, the efficiency of all the dAdapTP derivatives decreased compared to that using the Klenow Fragment. However, the incorporation selectivity of dAdapTP had improved against the oxodG-containing template for all the template sequences including the T-containing template. Moreover, 2-amino-dAdapTP showed a better efficiency than dAdapTP using the Bsu DNA polymerase. The 2-amino group of the adenosine unit may interact with syn-oxodG at the active site of the Bsu DNA polymerase during the single primer extension reaction.
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Affiliation(s)
| | - Ikuko Sagara
- Graduate School of Pharmaceutical Sciences, Kyushu University
| | - Yusuke Nagata
- Graduate School of Pharmaceutical Sciences, Kyushu University
| | | | - Shigeki Sasaki
- Graduate School of Pharmaceutical Sciences, Kyushu University
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3
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Kusano S, Sakuraba T, Hagihara S, Nagatsugi F. Synthesis of 6-amino-2-vinylpurine derivatives for cross-linking and evaluation of the reactivity. Bioorg Med Chem Lett 2012; 22:6957-61. [PMID: 23044366 DOI: 10.1016/j.bmcl.2012.08.122] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Revised: 07/25/2012] [Accepted: 08/30/2012] [Indexed: 01/01/2023]
Abstract
Oligodeoxynucleotides (ODNs) have been widely used for inhibiting the gene expression in antisense or antigene methods, and the interstrand cross-linking (ICL) forming ODNs have been expected to ensure the inhibition by these methods. Previously, we reported a highly efficient and selective ICL reaction toward cytosine using the 2-amino-6-vinylpurine derivative under acidic conditions. In this Letter, we report the synthesis of ODN containing 6-amino-2-vinylpurine derivatives and evaluation of the cross-linking reactivity.
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Affiliation(s)
- Shuhei Kusano
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai-shi, Miyagi 980-8577, Japan
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Nair V, Zhang F, Ma X, Bonsu E. Base-functionalized carbocyclic nucleosides: design, synthesis, and mechanism of antiviral activity. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2010; 28:408-23. [PMID: 20183592 DOI: 10.1080/15257770903044465] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
New carbocyclic ribonucleosides with unsaturated groups at the C-2 position of the nucleobase were designed as potential RNA antiviral compounds. The design was based on the expectation that the monophosphates of these compounds would be inhibitors of the enzyme, IMPDH. Appropriate methodologies were developed to achieve the target molecules. Results from the initial in vitro antiviral studies are mentioned. The IMPDH-associated mechanism of the antiviral activity of the most active compound is supported by enzyme inhibition studies.
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Affiliation(s)
- Vasu Nair
- Department of Pharmaceutical and Biomedical Sciences and the Center for Drug Discovery, University of Georgia, Athens, Georgia, USA.
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5
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Butler RS, Cohn P, Tenzel P, Abboud KA, Castellano RK. Synthesis, Photophysical Behavior, and Electronic Structure of Push−Pull Purines. J Am Chem Soc 2008; 131:623-33. [DOI: 10.1021/ja806348z] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Roslyn S. Butler
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
| | - Pamela Cohn
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
| | - Phillip Tenzel
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
| | - Khalil A. Abboud
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
| | - Ronald K. Castellano
- Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611-7200
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Straightforward C-8 Alkylation of 2'(or 3')-Azidoadenosine Derivatives by Utilizing Pd(0) Catalyst and Tetraalkyltin. B KOREAN CHEM SOC 2007. [DOI: 10.5012/bkcs.2007.28.6.915] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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7
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Alzeer J, Schärer OD. A modified thymine for the synthesis of site-specific thymine-guanine DNA interstrand crosslinks. Nucleic Acids Res 2006; 34:4458-66. [PMID: 16945959 PMCID: PMC1636361 DOI: 10.1093/nar/gkl587] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2006] [Revised: 07/26/2006] [Accepted: 07/28/2006] [Indexed: 01/14/2023] Open
Abstract
DNA interstrand crosslinks (ICLs) are highly cytotoxic lesions formed by a variety of important anti-tumor agents. Despite the clinical importance of ICLs, the mechanisms by which these lesions are repaired in mammalian cells have so far remained elusive. One of the obstacles in the study of ICL repair has been the limited availability of suitable methods for the synthesis of defined site-specific ICLs. We report here the synthesis of a site-specific ICL containing an ethylene-bridged G-T base pair based on the incorporation of a crosslink precursor containing a selectively reactive group on one strand using solid-phase synthesis. 3-(2-chloroethyl)thymidine was incorporated into oligonucleotides and underwent ICL formation upon annealing to a complementary strand by reacting with the base opposite to the modified T residue. A strong preference for ICL formation with a G residue opposite the reactive T was observed. Detailed characterization of the reaction product revealed that the alkylation reaction occurred with the O-6 group of G and a mechanism accounting for this preference is proposed. These G-T crosslinks introduced here will be useful for studies of ICL repair.
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Affiliation(s)
- Jawad Alzeer
- Institute of Molecular Cancer Research, University of ZurichWinterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Orlando D. Schärer
- Institute of Molecular Cancer Research, University of ZurichWinterthurerstrasse 190, 8057 Zurich, Switzerland
- Department of Pharmacological Sciences, Chemistry Graduate Building 619, Stony Brook UniversityStony Brook, NY11794-3400
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Tu C, Keane C, Eaton B. Carboxyamidation of Purine Nucleosides: New Secondary 8-Carboxamidopurine Nucleosides. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/07328319708001344] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Chi Tu
- a Medicinal Chemistry Department , NeXstar Pharmaceuticals Inc. , 2860 Wilderness Place, Boulder , CO , 80301
| | - Charlene Keane
- a Medicinal Chemistry Department , NeXstar Pharmaceuticals Inc. , 2860 Wilderness Place, Boulder , CO , 80301
| | - Bruce Eaton
- a Medicinal Chemistry Department , NeXstar Pharmaceuticals Inc. , 2860 Wilderness Place, Boulder , CO , 80301
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A Convenient Synthesis of 8-Alkyl-2' (or 3')-azido (or amino)-2' (or 3')-deoxyadenosine as Diverse Synthetic Precursors of Cyclic Adenosine Diphosphate Ribose (cADPR). B KOREAN CHEM SOC 2006. [DOI: 10.5012/bkcs.2006.27.7.986] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Mathieu R, Baurand A, Schmitt M, Gachet C, Bourguignon JJ. Synthesis and biological activity of 2-alkylated deoxyadenosine bisphosphate derivatives as P2Y(1) receptor antagonists. Bioorg Med Chem 2004; 12:1769-79. [PMID: 15028267 DOI: 10.1016/j.bmc.2003.12.041] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2003] [Accepted: 12/22/2003] [Indexed: 11/23/2022]
Abstract
A previous study around adenine nucleotides afforded the reference N(6)-methyl-2'-deoxyadenosine-3',5'-bisphosphate (1a, MRS 2179) as a selective human P2Y(1) receptor antagonist (pA(2)=6.55+/-0.05) with antithrombotic properties. In the present paper, we have synthesized and tested in vitro various 2-substituted derivatives with the goal of exploring the 2-position binding region and developing more potent P2Y(1) receptor antagonists. Thus, we have adopted a novel and versatile chemical pathway using a palladium-catalyzed cross-coupling reaction with the 2-iodinated derivative 7 as a common intermediate for a very efficient synthesis of the 2-alkyl-N(6)-methyl-2'-deoxyadenosine-3',5'-bisphosphate nucleotides 1e-i. The biological activity was evaluated through the ability of compounds to inhibit ADP-induced platelet aggregation, intracellular calcium rise and to displace the specific binding of [(33)P]2-MeSADP. 2-Ethyl and 2-propyl groups appeared to be tolerated, whereas a bulky group or a C(3) linear substituent dramatically decreased potency of antagonists. The 2-ethynyl derivative 1h (pA(2)=7.54+/-0.10) was significantly more potent (10-fold) as an antagonist when compared to the reference 1a, revealing a potential electronic interaction highly favorable between triple bond orbitals and the P2Y(1) receptor at this position.
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Affiliation(s)
- Romain Mathieu
- Laboratoire de Pharmacochimie de la Communication Cellulaire (CNRS, UMR 7081), Faculté de Pharmacie, Université Louis Pasteur, 74 route du Rhin, BP24, 67401 Illkirch cedex, France
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12
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Bonache MC, Chamorro C, Cordeiro A, Camarasa MJ, Jimeno ML, San-Félix A. Synthesis of Novel Bi-, Tri-, and Tetracyclic Nucleosides by Reaction of a Common Cyclic Enamine Derived from TSAO-T with Nucleophiles. J Org Chem 2004; 69:8758-66. [PMID: 15575754 DOI: 10.1021/jo048706p] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report here the efficient regio- and stereoselective synthesis of new polycyclic nucleosides using a common cyclic enamine (7) as the starting material. In fact, the reaction of 7, easily prepared by reaction of 5'-O-Tosyl TSAO-T under basic nonnucleophilic conditions (potassium carbonate), with different classes of nucleophiles, for example, nitrogen-, oxygen-, sulfur-, and carbon-based nucleophiles, or with amino acids afforded, with total regio- and stereoselectivity, new bi-, tri-, and tetracyclic nucleosides. This straighforward route represents an original and unambiguously regio- and stereoselective pathway to these compounds. Some of these polycyclic nucleosides may be useful intermediates for a second series of reactions that may lead to the generation of structurally new nucleosides.
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Affiliation(s)
- María-Cruz Bonache
- Instituto de Química Médica, CSIC, Juan de la Cierva 3, 28006 Madrid, Spain
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13
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Wnuk SF, Lewandowska E, Companioni DR, Garcia PI, Secrist JA. Synthesis and cytotoxicity of 9-(2-deoxy-2-alkyldithio-β-D-arabinofuranosyl)purine nucleosides which are stable precursors to potential mechanistic probes of ribonucleotide reductases. Org Biomol Chem 2004; 2:120-6. [PMID: 14737670 DOI: 10.1039/b311504f] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of 2[prime or minute]-thionucleosides, as potential inhibitors of ribonucleotide reductases, has been synthesized. Treatment of the 3[prime or minute],5[prime or minute]-O-TPDS-2[prime or minute]-O-(trifluoromethanesulfonyl)adenosine with potassium thioacetate gave the arabino epimer of 2[prime or minute]-S-acetyl-2[prime or minute]-thioadenosine which was deacetylated to give 9-(3,5-O-TPDS-2-thio-[small beta]-d-arabinofuranosyl)adenine in high yield. Treatment of the latter with diethyl azodicarboxylate-C(3)H(7)SH-THF gave 2[prime or minute]-propyl disulfide which was desilylated to give 9-(2-deoxy-2-propyldithio-[small beta]-d-arabinofuranosyl)adenine. Subsequent tosylation (O5[prime or minute]) and displacement of the tosylate with pyrophosphate afforded the 5[prime or minute]-O-diphosphate in a stable form as propyl mixed-disulfide, which upon treatment with dithiothreitol releases 9-(2-thio-[small beta]-d-arabinofuranosyl)adenine 5[prime or minute]-diphosphate. The arabino 2[prime or minute]-mercapto group might interact with the crucial thiyl radical at cysteine 439 leading to the inhibition of ribonucleotide reductases via formation of a Cys439-2[prime or minute]-mercapto disulfide bridge. The 2,6-diamino-, 2-amino-6-chloro- and 2-amino-6-methoxypurine ribosides were also converted to the corresponding 2[prime or minute]-deoxy-2[prime or minute]-propyldithio-[small beta]-d-arabinofuranosyl nucleosides, which might serve as convenient precursors to the arabino epimer of 2[prime or minute]-thioguanosine. Analogously, 2[prime or minute]-deoxy-2[prime or minute]-propyldithioadenosine was prepared from 9-([small beta]-d-arabinofuranosyl)adenine. The nucleoside disulfides show modest cytotoxicity in a panel of human tumor cell lines.
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Affiliation(s)
- Stanislaw F Wnuk
- Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA.
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Česnek M, Holý A, Masojídková M. New 2-Alkynyl Derivatives of the Acyclic Nucleoside 9-(2,3-Dihydroxypropyl)adenine and Their 6-Guanidinopurine Counterparts as Potential Effectors of Adenosine Receptors. ACTA ACUST UNITED AC 2003. [DOI: 10.1135/cccc20032201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
A series of the new 2-alkynyl derivatives of the acyclic nucleoside 9-(2,3-dihydroxypropyl)- adenine and their 6-guanidinopurine analogues were prepared by the Sonogashira coupling. The effect of the prepared compounds on A1 and A2A receptors was examined.
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Hocek M. Syntheses of Purines Bearing Carbon Substituents in Positions 2, 6 or 8 by Metal‐ or Organometal‐Mediated C−C Bond‐Forming Reactions. European J Org Chem 2002. [DOI: 10.1002/ejoc.200390025] [Citation(s) in RCA: 123] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Michal Hocek
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nám. 2, 16610 Prague 6, Czech Republic, Fax: (internat.) + 420‐2/33331271
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Kato K, Hayakawa H, Tanaka H, Kumamoto H, Shindoh S, Shuto S, Miyasaka T. A New Entry to 2-Substituted Purine Nucleosides Based on Lithiation-Mediated Stannyl Transfer of 6-Chloropurine Nucleosides. J Org Chem 1997. [DOI: 10.1021/jo970398q] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Keisuke Kato
- School of Pharmaceutical Sciences, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142, Japan, and Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060, Japan
| | - Hiroyuki Hayakawa
- School of Pharmaceutical Sciences, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142, Japan, and Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060, Japan
| | - Hiromichi Tanaka
- School of Pharmaceutical Sciences, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142, Japan, and Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060, Japan
| | - Hiroki Kumamoto
- School of Pharmaceutical Sciences, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142, Japan, and Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060, Japan
| | - Satoru Shindoh
- School of Pharmaceutical Sciences, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142, Japan, and Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060, Japan
| | - Satoshi Shuto
- School of Pharmaceutical Sciences, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142, Japan, and Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060, Japan
| | - Tadashi Miyasaka
- School of Pharmaceutical Sciences, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142, Japan, and Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12 Nishi-6, Kita-ku, Sapporo 060, Japan
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17
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Adah SA, Nair V. Synthesis of complex ethynyladenosines using organic triflic enolates in palladium-catalyzed reactions: Potential agonists for the adenosine A2 receptor. Tetrahedron 1997. [DOI: 10.1016/s0040-4020(97)00326-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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19
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Tu C, Keane C, Eaton BE. Palladium Catalysis in the Synthesis of 8-Position modified Adenosine, 2′-Deoxyadenosine and Guanosine. ACTA ACUST UNITED AC 1995. [DOI: 10.1080/15257779508009745] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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20
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Adah SA, Nair V. Triflic enolates in the palladium-mediated synthesis of complex ethynyl adenosines. Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)01315-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Gundersen LL, Langli G, Rise F. Regioselective Pd-mediated coupling between 2,6-dichloropurines and organometallic reagents. Tetrahedron Lett 1995. [DOI: 10.1016/0040-4039(95)00163-7] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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22
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23
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Gundersen LL, Kristin Bakkestuen A, Jørgen Aasen A, Øver»s H, Rise F. 6-Halopurines in palladium-catalyzed coupling with organotin and organozinc reagents. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)85540-x] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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24
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Mamos P, Van Aerschot AA, Weyns NJ, Herdewijn PA. Straightforward C-8 alkylation of adenosine analogues with tetraalkyltin reagents. Tetrahedron Lett 1992. [DOI: 10.1016/s0040-4039(00)74226-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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25
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Jixiang C, Crisp GT. Palladium-Catalysed Coupling of Organotinsulfides with Heteroaromatic Halides. SYNTHETIC COMMUN 1992. [DOI: 10.1080/00397919208019269] [Citation(s) in RCA: 11] [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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