Two uracil derivatives of methyl 3-(5-fluoro-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)propanoate (1) and methyl 3-(5-chloro-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)propanoate (2) were synthesized and characterized by elementary analyses, MS, IR and NMR. The crystal structures of 1 and 2 were determined by means of X-ray diffraction. Compound 1 crystallized in the monoclinic P21/c space group with a = 7.4213(9), b = 5.8480(7), c = 23.248(3) Å, and β = 108.184(4)°. Compound 2 crystallized in the monoclinic P21/c space group with a = 12.5754(12), b = 4.9363(5), c = 16.5352(15) Å, and β = 97.455(3)°. The thermal stabilities of 1 and 2 were studied by DSC–TGA techniques. The UV spectra indicated that the two compounds interacted with DNA by electrostatic binding. The X-ray diffraction revealed that the N–H···O inter-molecular hydrogen bond in solid state of the two title compounds resulted in antiparallel β-sheet arrangement.
合成了 3-(5-
氟-2,4-二氧代-3,4-二氢
嘧啶-1(2H)-基)
丙酸甲酯(1)和 3-(5-
氯-2,4-二氧代-3,4-二氢
嘧啶-1(2H)-基)
丙酸甲酯(2)的两种尿
嘧啶衍
生物,并通过基本分析、质谱、红外光谱和核磁共振对其进行了表征。通过 X 射线衍射确定了 1 和 2 的晶体结构。化合物 1 结晶于单斜 P21/c 空间群,a = 7.4213(9),b = 5.8480(7),c = 23.248(3) 埃,β = 108.184(4)°。化合物 2 结晶于单斜 P21/c 空间群,a = 12.5754(12),b = 4.9363(5),c = 16.5352(15) 埃,β = 97.455(3)°。通过
DSC-TGA 技术研究了 1 和 2 的热稳定性。紫外光谱显示这两种化合物通过静电结合与 DNA 发生作用。X 射线衍射显示,两种标题化合物在固态下的 N-H-O 分子间氢键导致了反平行的 β 片状排列。