title: 7-Deaza-2'-deoxy-7-propynylguanosine.
abstract: The title compound, C14H16N4O4, adopts the anti conformation at the glycosylic bond [chi -117.1 (5) degrees]. The sugar pucker of the 2'-deoxyribofuranosyl moiety is C2'-endo-C3'-exo, 2T3 (S-type). The orientation of the exocyclic C4'-C5' bond is +sc (gauche). The propynyl group is linear and coplanar with the nucleobase moiety. The structure of the compound is stabilized by several hydrogen bonds (N-H...O and O-H...O), leading to the formation of a multi-layered network. The nucleobases, as well as the propynyl groups, are stacked. This stacking might cause the extraordinary stability of DNA duplexes containing this compound.
authors.affiliation: Laboratorium für Organische und Bioorganische Chemie, Institut für Chemie, Universität Osnabrück, Barbarastrasse 7, 49069, Germany. frank.seela@uni-osnabrueck.de
authors.forename: Frank
authors.initials: F
authors.lastname: Seela
authors.forename: Khalil
authors.initials: K
authors.lastname: Shaikh
authors.forename: Henning
authors.initials: H
authors.lastname: Eickmeier
mesh_terms: D001372:Aza Compounds / Q000737:chemistry*; D018360:Crystallography, X-Ray; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000737:chemistry; D006860:Hydrogen Bonding; D015394:Molecular Structure
chemical_list: D001372:Aza Compounds; D003849:Deoxyguanosine