The title compound systematic name: 4-amino-1-(2-deoxy-β-D-erythro-pentofuranosyl)-5-[6-(1-benzyl-1H-1,2,3-triazol-4-yl)hex-1-ynyl]pyrimidin-2(1H)-one}, C24H28N6O4, shows two conformations in the crystalline state,viz.(I-1) and (I-2). The pyrimidine groups and side chains of the two conformers are almost superimposable, while the greatest differences between them are observed for the sugar groups. The N-glycosylic bonds of both conformers adopt similaranticonformations, with χ = −168.02 (12)° for conformer (I-1) and χ = −159.08 (12)° for conformer (I-2). The sugar residue of (I-1) shows anN-type (C3′-endo) conformation, withP= 33.1 (2)° and τm= 29.5 (1)°, while the conformation of the 2′-deoxyribofuranosyl group of (I-2) isS-type (C3′-exo), withP = 204.5 (2)° and τm= 33.8 (1)°. Both conformers participate in hydrogen-bond formation and exhibit identical patterns resulting in three-dimensional networks. Intermolecular hydrogen bonds are formed with neighbouring molecules of different and identical conformations (N—H...N, N—H... O, O—H...N and O—H...O).
标题化合物系统名称:4-氨基-1-(2-脱氧-β-D-赤式戊呋喃糖基)-5-[6-(1-苄基-1H-1,2,3-三唑-4-基)己-1-炔基]嘧啶-2(1H)-酮},C24H28N6O4,在结晶状态下有两种构象,即(I-1)和(I-2)。两种构象的嘧啶基团和侧链几乎可以叠加,而糖基团的差异最大。两种构象的 N-糖苷键具有相似的构象,构象(I-1)的χ = -168.02 (12)°,构象(I-2)的χ = -159.08 (12)°。(I-1)的糖残基呈 N 型(C3′-内)构象,P= 33.1 (2)°,τm= 29.5 (1)°,而(I-2)的 2′-脱氧核糖基的构象为 S 型(C3′-外),P= 204.5 (2)°,τm= 33.8 (1)°。两种构象都参与了氢键的形成,并表现出相同的模式,形成三维网络。分子间氢键是与不同构象和相同构象的相邻分子(N-H...N、N-H...O、O-H...N 和 O-H...O)形成的。