title: Synthesis, X-ray crystal structural study, antiviral and cytostatic evaluations of the novel unsaturated acyclic and epoxide nucleoside analogues.
abstract: A series of the novel purine and pyrimidine nucleoside analogues were synthesised in which the sugar moiety was replaced by the 4-amino-2-butenyl (2-6 and 10-18) and oxiranyl (8 and 20) spacer. The Z- (2-6) and E-isomers (10-18) of unsaturated acyclic nucleoside analogues were synthesized by condensation of 2- and 6-substituted purine and 5-substituted uracil bases with Z- (1) or E-phthalimide (9) precursors. The oxiranyl nucleoside analogues (8 and 20) were obtained by epoxidation of 1 and 9 with m-chloroperoxybenzoic acid and subsequent coupling with adenine. The new compounds were evaluated for their antiviral and antitumor cell activities. Among the olefinic nucleoside analogues, Z-isomer of adenine containing 4-amino-2-butenyl side chain (6) exhibited the best cytostatic activities, particularly against colon carcinoma (SW 620, IC50 = 26 microM). Its E-isomer 15 did not show any antiproliferative activity against malignant tumor cell lines, except for a slight inhibition of colon carcinoma (SW 620, IC50 = 56.5 microM) cells. In general, Z-isomers showed better cytostatic activities than the corresponding E-isomers. (Z)-4-Amino-2-butenyl-adenine nucleoside analogue 6 showed albeit modest but selective activity against HIV-1 (EC50 = 4.83 microg mL(-1)).
authors.affiliation: Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia.
authors.forename: Vedran
authors.initials: V
authors.lastname: Kristafor
authors.forename: Silvana
authors.initials: S
authors.lastname: Raić-Malić
authors.forename: Mario
authors.initials: M
authors.lastname: Cetina
authors.forename: Marijeta
authors.initials: M
authors.lastname: Kralj
authors.forename: Lidija
authors.initials: L
authors.lastname: Suman
authors.forename: Kresimir
authors.initials: K
authors.lastname: Pavelić
authors.forename: Jan
authors.initials: J
authors.lastname: Balzarini
authors.forename: Erik
authors.initials: E
authors.lastname: De Clercq
authors.forename: Mladen
authors.initials: M
authors.lastname: Mintas
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D000998:Antiviral Agents / Q000138:chemical synthesis / Q000737:chemistry* / Q000494:pharmacology; D049109:Cell Proliferation / Q000187:drug effects; D003110:Colonic Neoplasms / Q000188:drug therapy / Q000473:pathology; D018360:Crystallography, X-Ray; D004354:Drug Screening Assays, Antitumor; D004852:Epoxy Compounds; D015497:HIV-1 / Q000187:drug effects; D006801:Humans; D007536:Isomerism; D015394:Molecular Structure; D009705:Nucleosides / Q000138:chemical synthesis* / Q000494:pharmacology*; D013329:Structure-Activity Relationship
chemical_list: D000970:Antineoplastic Agents; D000998:Antiviral Agents; D004852:Epoxy Compounds; D009705:Nucleosides