title: 2-azapurine nucleosides: synthesis, properties, and base pairing of oligonucleotides.
abstract: This review deals with 2-azapurine (imidazo[4,5-d] [1,2,3]triazine) nucleosides and closely related analogs. Different routes are described to yield the desired target compounds, including a sequence of ring-opening and ring-closure reactions performed on purine nucleosides or direct glycosylation of a 2-azapurine nucleobase with a sugar halide. Further, physical and spectroscopic properties of 2-azapurine nucleosides are discussed, including fluorescence, (13)C-NMR data, single-crystal X-ray analyses, and conformation studies on selected compounds; new biological data are presented. The second part of this review is dedicated to oligonucleotides containing 2-azapurines, including building-block (phosphoramidite) preparation and their use in solid-phase oligonucleotide synthesis. Base-pairing properties of 2-azapurine nucleosides as surrogates of canonical constituents of DNA were evaluated.
authors.affiliation: Laboratory of Bioorganic Chemistry and Chemical Biology, Center for Nanotechnology, Heisenbergstrasse 11, Münster.
authors.forename: Simone
authors.initials: S
authors.lastname: Budow
authors.forename: Frank
authors.initials: F
authors.lastname: Seela
mesh_terms: D000970:Antineoplastic Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000998:Antiviral Agents / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D001372:Aza Compounds / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D020029:Base Pairing; D002236:Carbohydrate Conformation; D009682:Magnetic Resonance Spectroscopy; D009841:Oligonucleotides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D011684:Purine Nucleosides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000970:Antineoplastic Agents; D000998:Antiviral Agents; D001372:Aza Compounds; D009841:Oligonucleotides; D011684:Purine Nucleosides