To reveal the scope of the syntheses of 3-aryl-2-quinolinones from 2-nitro-α-phenylcinnamic acids, the isomerization of (E)-2-amino-α-phenylcinnamic acids was studied. The results showed that (E)-2-amino-α-phenylcinnamic acids were isomerized to its (Z)-forms under sunlight in organic solvents. The reaction temperature and the functional groups at both phenyl rings have no effect on the isomerization of (E)-2-amino-α-phenylcinnamic acids and the following intramolecular spontaneous amidation of (Z)-2-amino-α-phenylcinnamic acids. Various 3-aryl-2-quinolinones prepared in high total yields indicated that the syntheses of 3-aryl-2-quinolinones from Perkin condensation products 2-nitro-α-phenylcinnamic acids via reduction, sunlight-induced isomerization of (E)-2-amino-α-phenylcinnamic acids, and the following intramolecular amidation is an efficient procedure. Key words: 3-aryl-2-quinolinones, isomerization, amidation.
为了揭示从 2-硝基-α-苯基肉桂酸合成 3-芳基-2-喹啉酮的范围,研究了 (E)-2 氨基-α-苯基肉桂酸的异构化。结果表明,在有机溶剂中,(E)-2-氨基-α-苯基肉桂酸在阳光下异构化为其(Z)形式。反应温度和两个苯基环上的官能团对(E)-2-氨基-α-苯基肉桂酸的异构化和随后(Z)-2-氨基-α-苯基肉桂酸的分子内自发酰胺化没有影响。总产率高的各种 3-芳基-2-喹啉酮的制备表明,从 Perkin 缩合产物 2-硝基-α-苯基肉桂酸通过还原、日光诱导的 (E)-2- 氨基-α-苯基肉桂酸异构化和随后的分子内酰胺化合成 3-芳基-2-喹啉酮是一种高效的方法。关键字3-芳基-2-喹啉酮 异构化 氨基化