Facile Diversity-Oriented Synthesis and Antitubercular Evaluation of Novel Aryl and Heteroaryl Tethered Pyridines and Dihydro-6<i>H</i>-quinolin-5-ones Derived via Variants of the Bohlmann–Rahtz Reaction
作者:Srinivas Kantevari、Santhosh Reddy Patpi、Dinesh Addla、Siddamal Reddy Putapatri、Balasubramanian Sridhar、Perumal Yogeeswari、Dharmarajan Sriram
DOI:10.1021/co2000604
日期:2011.7.11
nes tethered with aryls and heteroaryls was achieved in very good yields through CeCl3·7H2O-NaI catalyst via variants of the Bohlmann–Rahtz reaction. β-Enaminones derived from various aryl and heteroaryl methyl ketones were regioselectively reacted with ethyl acetoacetate or 5,5-dimethylcyclohexane-1,3-dione or 4,4-dimethylcyclohexane-1,3-dione and ammonium acetate refluxing in 2-propanol. Applicability
通过CeCl 3 ·7H 2可以很好的收率实现取代的吡啶和与芳基和杂芳基连接的二氢-6 H-喹啉-5-酮的多样性合成通过Bohlmann–Rahtz反应的变体生成O-NaI催化剂。使衍生自各种芳基和杂芳基甲基酮的β-烯酮与乙酰乙酸乙酯或5,5-二甲基环己烷-1,3-二酮或4,4-二甲基环己烷-1,3-二酮和乙酸铵在2-丙醇中回流进行区域选择性反应。无毒铈催化剂的适用性,与宽范围的芳基和杂芳基β-烯胺酮具有高反应活性,从而导致各种类似物,操作简便以及在相对较低的温度下较短的反应时间是已开发方案的突出特点。已评估了这些合成的取代吡啶和二氢-6 H-喹啉-5-酮类似物对结核分枝杆菌的体外抗分枝杆菌活性通过琼脂稀释法获得H37Rv(MTB)。在筛选出的48种化合物中,有6种化合物2-(5-氯噻吩-2-基)-7,7-二甲基-7,8-二氢-6 H-喹啉-5-一4 13,2 },2-( 5-溴噻吩-2-基-7