crystal X-ray diffraction studies. The quinoxaline portion of II is almost planar with the substituent containing the dimethylamino and carboxyethyl groups rotated well out of its mean plane. In the crystal, C—H···O and C—H···N hydrogen bonds as well as C—H···π(ring) interactions form chains having a U-shaped cross-section and running along the c-axis direction. Two sets of pair-wise C—H···O hydrogen bonds
摘要 两种新化合物,即 (2E)-3-(二甲基
氨基)-2-(3-methoxyquinoxalin-2-yl)propen-2-enoate ( II ) 和 2-(3-oxo-4-(prop-2)
乙酯-yn-1-yl)-3,4-dihydroquinoxalin-2-yl)-3-phenylpropanoate ( III ) 由 2-(oxo-3,4-dihydroquinoxalin-2-yl)
乙酸乙酯 ( I ) 合成。使用 NMR ( 1 H 和13 C)、傅里叶变换红外对化合物进行表征,并通过单晶 X 射线衍射研究证实。II的
喹喔啉部分几乎是平面,含有
二甲氨基和羧乙基的取代基很好地旋转出其平均平面。在晶体中,C—H···O和C—H···N氢键以及C—H···π(环)相互作用形成U形截面并沿c方向延伸的链。 -轴方向。两组成对的 C—H···O 氢键将链连接成波纹片。在III