Regioselective one-pot three-component synthesis of quinoline based 1,2,4-triazolo[1,5-a]quinoline derivatives
作者:Gaurav G. Ladani、Manish P. Patel
DOI:10.1039/c5ra15560f
日期:——
A one-pot three-component approach for the synthesis of 2-(piperidin-1-yl) quinoline based 1,2,4-triazolo[1,5-a]quinoline derivatives (4a–l) has been described by the reaction of aldehyde (1a–f), methyl 2-cyanoacetate (2) and enaminones (3a–b). Different regioselectivities of the reaction are attained with different catalysts and the highest regioselectivity is achieved by L-proline. This new procedure
反应描述了一种基于一锅三组分法合成基于2-(哌啶-1-基)喹啉的1,2,4-三唑并[1,5- a ]喹啉衍生物(4a-1)的方法。乙醛(1a–f),2-氰基乙酸甲酯(2)和烯胺酮(3a–b)。用不同的催化剂可获得不同的反应区域选择性,而L-脯氨酸可达到最高的区域选择性。此新程序提供了一种构建包含1,2,4-三唑类似物的稠合三环杂环的有效方法。在这方面,我们使用了最少量的两性催化剂,例如L-脯氨酸,乙酸铵和吡咯烷与乙酸的混合物,得到作为副产物的1,4-二氢喹啉衍生物5a。该方案的主要特点是反应条件温和,产率高(75-85%)和对所需产物4a-1的区域选择性更高。通过FT-IR,1 H NMR,13 C NMR和质谱确认标题化合物的结构。