Structure and POM analyses of 2-{(2Z)-2-[(2R)-2-ethoxy-4-oxo-2H-chromen-3(4H)-ylidene]hydrazinyl}benzonitrile with promising parasitological activity
作者:Khadijah Al-Zaydi、Saad M. Alshehri、Taibi Ben Hadda
DOI:10.1007/s11164-015-2143-x
日期:2016.3
Functionalised chromanone (4) is prepared by the condensation of aryldiazonium salt (2) and enaminones (1) in ethanol at room temperature. The structure of (4) was determined by spectral (IR, 1H and 13C NMR), elemental and X-ray diffraction analysis. Compound 4 (C18H15N3O3) crystallizes in the monoclinic space group P21/c with a = 7.9182(5), b = 21.729(2), c = 9.6217(7) Å, β = 97.293(6)°, V = 1642.0(2) Å3, Z = 4. The molecule of compound (4) is bent at the C-16 atom with a C15–O2–C16–C8 torsion angle of 46.18(3)°. Intramolecular phenolic N–H···O hydrogen bonds are also formed. Intermolecular hydrogen bonding and π–π stacking hold the molecules together. The average distance between stacked benzene ring planes is 4.488(12) Å. The preliminary POM analyses of 4 confirm the coexistence of two combined antibacterial and antiparasite pharmacophore sites. Therefore, compound 4 is promising and it should be screened without hesitation against virulent and pathogenic biotargets.
功能化的色满酮(4)通过在室温下乙醇中芳基重氮盐(2)与烯胺酮(1)的缩合反应制备。通过光谱(IR、1H和13C NMR)、元素和X射线衍射分析确定结构(4)。化合物4(C18H15N3O3)结晶为单斜空间群P21/c,其中a=7.9182(5)Å,b=21.729(2)Å,c=9.6217(7)Å,β=97.293(6)°,V=1642.0(2)ų,Z=4。化合物(4)的分子在C-16原子处弯曲,C15–O2–C16–C8扭转角为46.18(3)°。形成分子内酚羟基N–H···O氢键。分子间氢键和π–π堆积作用使分子结合在一起。堆叠的苯环平面之间的平均距离为4.488(12)Å。初步的POM分析表明4存在两个结合抗菌和抗寄生虫活性的药效团部位。因此,化合物4具有潜在价值,应毫不犹豫地对其进行针对高毒性和病原性生物靶点的筛选。