2-Methyl-3-chloro-9-hydroxy-4-oxo-4H-pyrido[1,2-a]pyrimidine Hydrochloride: Crystal Structure and Interaction with DNA
作者:Huaihong Zhang、Rong Huang、Zhaosheng Cai、Chunxiang Xu、Baiwang Sun
DOI:10.1007/s10870-012-0383-9
日期:2013.2
The title compound, C9H8ClN2O2 +·Cl−, is a hydrochloric acid salt of 2-methyl-3-chloro-9- hydroxy-4H-pyrido[1,2-a]pyrimidine-4-one, which is an important intermediate for the synthesis of biologically active heterocyclic compounds. The synthesized compound was characterized by 1H NMR and X-ray crystallography. The structure was solved in monoclinic, space group P21/n with a = 11.8295 (12), b = 6.2214 (6), c = 13.8133 (15) Å, β = 97.7860 (10)°, V = 1007.23 (18) Å3, Z = 4, and with R int = 0.077. The cation of the title compound, as shown by the single-crystal structure determination, has two conjugated aromatic rings that are almost coplanar with a dihedral angle of 0.230°. The crystal packing is stabilized by intermolecular N–H···Cl, O–H···Cl hydrogen bonds, which link the molecules into centrosymmetric dimers, and by weak π–π stacking interactions (average distance 3.352 Å). The interaction of native calf thymus DNA (ctDNA) with the compound at physiological pH was monitored by UV–Vis spectroscopy and viscosimetric techniques. It was found that the compound might interact with ctDNA by a groove mode of binding via hydrogen bonds. The title compound, C9H8ClN2O2 +·Cl−, is a hydrochloric acid salt of 2-methyl-3- chloro-9-hydroxy-4H-pyrido[1,2-a]pyrimidine-4-one, which is an important inter-mediate for the synthesis of biologically active heterocyclic compounds. It was found that the compound might interact with ctDNA by a groove mode of binding.
标题化合物 C9H8ClN2O2 +-Cl- 是 2-甲基-3-氯-9-羟基-4H-吡啶并[1,2-a]嘧啶-4-酮的盐酸盐,后者是合成具有生物活性的杂环化合物的重要中间体。合成的化合物通过 1H NMR 和 X 射线晶体学进行了表征。其结构为单斜结构,空间群为 P21/n,a = 11.8295 (12),b = 6.2214 (6),c = 13.8133 (15) Å, β = 97.7860 (10)°, V = 1007.23 (18) Å3, Z = 4, R int = 0.077.单晶结构测定结果表明,标题化合物的阳离子有两个共轭芳香环,几乎共面,二面角为 0.230°。分子间的 N-H--Cl、O-H--Cl 氢键将分子连接成中心对称的二聚体,而微弱的 π-π 堆积相互作用(平均距离为 3.352 埃)则稳定了晶体的堆积。通过紫外可见光谱和比粘技术监测了在生理 pH 值下原生小牛胸腺 DNA(ctDNA)与该化合物的相互作用。研究发现,该化合物可能通过氢键以沟槽结合模式与ctDNA相互作用。标题化合物 C9H8ClN2O2 +-Cl- 是 2-甲基-3-氯-9-羟基-4H-吡啶并[1,2-a]嘧啶-4-酮的盐酸盐,后者是合成具有生物活性的杂环化合物的重要中间体。研究发现,该化合物可能通过沟槽结合模式与 ctDNA 发生相互作用。