The anomers of 8-aza-7-deaza-2′-deoxy-adenosine

Article abstract of DOI:10.1107/S010827019901015X

The structures of 4-amino-1-(2-deoxy-β-D-erythro-pentofuranosyl)-1H-pyrazolo[3,4-d] pyrimidine, (I), and 4-amino-1-(2-deoxy-α-D-erythro-pentofuranosyl)-1H-pyrazolo[3,4-d] pyrimidine, (II), both C₁₀H₁₃N₅O₃, have been determined. The sugar puckering of both compounds is C-2′-endo-C-3′exo (^2′T_3′) (S-type sugar). The N-glycosidic torsion angle χ¹ is in me anti range [-106.3 (2)° for (I) and 111.5 (3)° for (II)] and the crystal structure is stabilized by hydrogen bonds.