6-Chloropurine-riboside - CAS 5399-87-1
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CAS 5399-87-1 6-Chloropurine-riboside

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Reference Reading

1.5-Cyanoimino-4-oxomethylene-4,5-dihydroimidazole and 5-cyanoamino-4-imidazolecarboxylic acid intermediates in nitrosative guanosine deamination: evidence from 18O-labeling experiments.
Rayat S1, Majumdar P, Tipton P, Glaser R. J Am Chem Soc. 2004 Aug 18;126(32):9960-9.
The nitrosative deaminations (37 degrees C, NaNO2, NaAc buffer, pH 3.7) of guanosine 1r in (18O)water (97.6%) and of [6-18O]-1r in normal water were studied. [6-(18)O]-1r was prepared from 2-amino-6-chloropurine riboside using adenosine deaminase. The reaction products xanthosine 3r and oxanosine 4r were separated by HPLC and characterized by LC/MS analysis and 13C NMR spectroscopy. The 18O-isotopic shifts on the 13C NMR signals were measured and allowed the identification of all isotopomers formed. The results show that oxanosine is formed via 5-cyanoimino-4-oxomethylene-4,5-dihydroimidazole, 5, and its 1,4-addition product 5-cyanoamino-4-imidazolecarboxylic acid, 6. This hydration of 5 to 6 leads to aromatization and greatly dominates over water addition to the cyanoimino group of 5 to form 5-guanidinyliden-4-oxomethylene-4,5-dihydroimidazole, 7. 5-Guanidinyl-4-imidazolecarboxylic acid, 8, the product of water addition to 6, is not involved.
2.Preparation, biological activity and endogenous occurrence of N6-benzyladenosines.
Dolezal K1, Popa I, Hauserová E, Spíchal L, Chakrabarty K, Novák O, Krystof V, Voller J, Holub J, Strnad M. Bioorg Med Chem. 2007 Jun 1;15(11):3737-47. Epub 2007 Mar 16.
Cytokinin activity of forty-eight 6-benzyladenosine derivatives at both the receptor and cellular levels as well as their anticancer properties were compared in various in vitro assays. The compounds were prepared by the condensation of 6-chloropurine riboside with corresponding substituted benzylamines and characterized by standard collection of physico-chemical methods. The majority of synthesized derivatives exhibited high activity in all three of the cytokinin bioassays used (tobacco callus, wheat leaf senescence and Amaranthus bioassay). The highest activities were observed in the senescence bioassay. For several of the compounds tested, significant differences in activity were found between the bioassays used, indicating that diverse recognition systems may operate. This suggests that it may be possible to modulate particular cytokinin-dependent processes with specific compounds. In contrast to their high activity in bioassays, the tested compounds were recognized with only very low sensitivity in both Arabidopsis thaliana AHK3 and AHK4 receptor assays.
3.Synthesis of 6-arylthio analogs of 2',3'-dideoxy-3'-fluoroguanosine and their effect against hepatitis B virus replication.
Torii T1, Onishi T, Izawa K, Maruyama T, Demizu Y, Neyts J, De Clercq E. Nucleosides Nucleotides Nucleic Acids. 2006;25(4-6):655-65.
A key compound, 2-amino-6-chlor-9-(2,3-dideoxy-3-fluoro-beta-D-erythro-pentofuranosyl)puine, was prepared from 2-amino-6-chloropurine riboside in 5 steps, then subjected to the nucleophilic displacement with benzenethiols to afford 6-arylthio congeners. These compounds showed a similar anti-HBV effect to that of 2',3' dideoxy-3'-fluoroguanosine.
4.Introduction of a benzyl group onto the 2'-OH of 6-chloropurine 3'-O-benzoylriboside.
Kozai S1, Fuzikawa T, Harumoto K, Maruyama T. Nucleosides Nucleotides Nucleic Acids. 2003 May-Aug;22(5-8):779-81.
A new method to introduce a benzyl group onto the 2'-OH of purine ribonucleoside is described. Thus, 6-chloropurine 3'-O-benzoylriboside and its 5'-O-trityl congener were condensed with benzyl alcohol using the Mitsunobu reaction to give the 2'-O-benzyl derivative. The yields were varied from 4.6 to 62.9% depending on the solvent. The product was converted to adenosine, indicating that the stereochemistry at C-2' is retained.