Cycloaddition of a 1,2-diaza-1,3-butadiene to phenylpropiolic acid: an efficient route to pyridazinoquinolone derivatives
作者:Arun Kumar Padhy、Pratigyan Purohit、Mousumi Bardhan、C.S. Panda、M.P.S. Ishar
DOI:10.1016/j.tetlet.2004.08.165
日期:2004.11
Diazocoupling of dihydroquinolin-4-ones with aryldiazonium nitrates gave the corresponding diazo derivatives, which undergo facile (4+2) cycloaddition reactions with phenylpropiolic acid to afford 2-aryl-4a-methyl-10-oxo-4-phenyl-2,4a,5,10-tetrahydropyridazino[4,3-b]quinoline-3-carboxylic acid derivatives 3. However, with β-nitrostyrene a mixture of three isomeric products 4a–c was obtained.
将二氢喹啉-4-酮与硝酸芳基重氮进行重氮偶合,得到相应的重氮衍生物,将其与苯丙酸进行容易的(4 + 2)环加成反应,得到2-芳基-4a-甲基-10-氧代-4-苯基-2,4a ,5,10-四氢吡啶并[4,3- b ]喹啉-3-羧酸衍生物3。但是,使用β-硝基苯乙烯,可以得到三种异构体产物4a – c的混合物。