Synthesis of pyridazino[4,5-<i>b</i>]indole derivatives from 2-(3-carboxy-1-methylindole)acetic acid anhydride
作者:A. Monge、J. A. Palop、T. Goñi、E. Fernández-Alvarez
DOI:10.1002/jhet.5570230128
日期:1986.1
ethyl-1-oxo-1,2-dihydro-5H/-pyridazino[4,5-b]indoles 3 were obtained (47–67%), and these compounds characterized as the respective benzylidene derivatives 4. Compounds 2 react with amines (aniline, morpholine, piperidine) to give the respective 2-(3-carboxy-1-methylindole)aceta-mide 5 or the respective 2-aryl-4-carboxamido-5-methyl-5H-pyridazino[4,5-b]indole 6, the product obtained depending on the
2-(3-羧基-1-甲基吲哚)乙酸酐(1)与芳基重氮盐反应,得到85-95%的相应α-肼基酸酐2。用在二甲苯中沸腾的水合肼处理2,得到各自的2-芳基-4-碳肼基-5-甲基-1-氧代-1,2-二氢-5 H /-哒嗪[4,5- b ]吲哚3( 47-67%),这些化合物的特征分别为亚苄基衍生物4。化合物2与胺(苯胺,吗啉,哌啶)反应,得到相应的2-(3-羧基-1-甲基吲哚)乙酰胺5或相应的2-芳基-4-羧酰胺基-5-甲基-5 H-吡啶并[4,5- b ]吲哚6,取决于芳基取代基的结构而获得的产物。将2b(芳基= 4-氯苯基)与5%氢氧化钠煮沸,得到(80%)2-(3-羧基-1-甲基吲哚)乙酸(7)。2b的水解得到7和2-(3-羧基-1-甲基吲哚基)-2-(4-氯苯基肼基)乙酸(8)的混合物。