title: 2'-Deoxyimmunosine: a thiazolo[4,5-d]pyrimidine nucleoside adopting the syn conformation.
abstract: The title compound [systematic name: 5-amino-3-(2-deoxy-beta-D-erythro-pentofuranosyl)thiazolo[4,5-d]pyrimidine-2,7-(3H,6H)-dione], C(10)H(12)N(4)O(5)S, exhibits a syn glycosylic bond conformation, with a torsion angle chi of 61.0 (3) degrees. The furanose moiety adopts the N-type sugar pucker ((3)T4), with P = 33.0 (5) degrees and tau(m) = 15.1 (1) degrees. The conformation at the exocyclic C4'-C5' bond is +ap (trans), with the torsion angle gamma = 176.71 (14) degrees. The extended structure is a three-dimensional hydrogen-bond network involving O-H...O and N-H...O hydrogen bonds.
authors.affiliation: Laboratorium für Organische und Bioorganische Chemie, Institut für Chemie, Universität Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany. frank.seela@uni-osnabrueck.de
authors.forename: Frank
authors.initials: F
authors.lastname: Seela
authors.forename: Xin
authors.initials: X
authors.lastname: Ming
authors.forename: Simone
authors.initials: S
authors.lastname: Budow
authors.forename: Henning
authors.initials: H
authors.lastname: Eickmeier
authors.forename: Hans
authors.initials: H
authors.lastname: Reuter
mesh_terms: D018360:Crystallography, X-Ray; D006860:Hydrogen Bonding; D008958:Models, Molecular; D008968:Molecular Conformation; D011741:Pyrimidine Nucleosides / Q000737:chemistry*; D013844:Thiazoles / Q000737:chemistry*
chemical_list: C524201:5-amino-3-(2-deoxypentofuranosyl)thiazolo(4,5-d)pyrimidine-2,7-3H,6H-dione; D011741:Pyrimidine Nucleosides; D013844:Thiazoles