Structures are reported for two matched sets of substituted 4-styrylquinolines which were prepared by the formation of the heterocyclic ring in cyclocondensation reactions between 1-(2-aminophenyl)-3-arylprop-2-en-1-ones with 1,3-dicarbonyl compounds. (E)-3-Acetyl-4-[2-(4-methoxyphenyl)ethenyl]-2-methylquinoline, C21H19NO2, (I), (E)-3-acetyl-4-[2-(4-bromophenyl)ethenyl]-2-methylquinoline, C20H16BrNO, (II), and (E)-3-acetyl-2-methyl-4-2-[4-(trifluoromethyl)phenyl]ethenyl}quinoline, C21H16F3NO, (III), are isomorphous and in each structure the molecules are linked by a single C—H...O hydrogen bond to form C(6) chains. In (I), but not in (II) or (III), this is augmented by a C—H...π(arene) hydrogen bond to form a chain of rings; hence, (I)–(III) are not strictly isostructural. By contrast with (I)–(III), no two of ethyl (E)-4-[2-(4-methoxyphenyl)ethenyl]-2-methylquinoline-3-carboxylate, C22H21NO3, (IV), ethyl (E)-4-[2-(4-bromophenyl)ethenyl]-2-methylquinoline-3-carboxylate, C21H18BrNO2, (V), and ethyl (E)-2-methyl-4-2-[4-(trifluoromethyl)phenyl]ethenyl}quinoline-3-carboxylate, C22H18F3NO2, (VI), are isomorphous. The molecules of (IV) are linked by a single C—H...O hydrogen bond to form C(13) chains, but cyclic centrosymmetric dimers are formed in both (V) and (VI). The dimer in (V) contains a C—H...π(pyridyl) hydrogen bond, while that in (VI) contains two independent C—H...O hydrogen bonds. Comparisons are made with some related structures, and both the regiochemistry and the mechanism of the heterocyclic ring formation are discussed.
报告了两组匹配的取代型 4-
苯乙烯基
喹啉的结构,它们是通过 1-(2-
氨基
苯基)-3-芳基丙-2-
烯-1-
酮与 1,3-二羰基化合物的环缩合反应形成杂环而制备的。(E)-3-
乙酰基-4-[2-(4-
甲氧基苯基)
乙烯基]-
2-甲基喹啉,
C21H19NO2,(I);(E)-3-
乙酰基-4-[2-(4-
溴苯基)
乙烯基]-
2-甲基喹啉,
C20H16BrNO,(II)、和(E)-3-
乙酰基-
2-甲基-4-2-[4-(三
氟甲基)
苯基]
乙烯基}
喹啉,
C21H16F3NO,(III),是同构物,在每种结构中,分子通过单个 C-H..O
氢键连接,形成C(6)链。在(I)中,而不是在(II)或(III)中,C-H...π(arene)
氢键增加,形成环链;因此,(I)-(III)不是严格意义上的同构结构。与(I)-(III)相比,(E)-4-[2-(4-
甲氧基苯基)
乙烯基]-
2-甲基喹啉-3-羧酸乙酯,
C22H21NO3,(IV),(E)-4-[2-(4-
溴苯基)
乙烯基]-
2-甲基喹啉-3-羧酸乙酯中没有两个、
C21H18BrNO2,(V) 和 (E)-
2-甲基-4-2-[4-(三
氟甲基)
苯基]
乙烯基}
喹啉-3-羧酸乙酯,
C22H18F3NO2,(VI) 是同构物。(IV)的分子通过单个 C-H...O
氢键连接形成 C(13) 链,但在(V)和(VI)中都形成了环状中心对称二聚体。(V)中的二聚体含有一个 C-H...π(
吡啶基)
氢键,而(VI)中的二聚体含有两个独立的 C-H...O
氢键。本研究将这些二聚物与一些相关结构进行了比较,并讨论了杂环形成的区域
化学和机理。