Synthesis of C3-nitroalkylated-4-hydroxycoumarin and hydroxyiminodihydrofuroquinolinone derivatives via the Michael addition of cyclic 1,3-dicarbonyl compounds to β-nitrostyrenes
作者:Deepak Kumar Barange、Veerababurao Kavala、Chun-Wei Kuo、Po-Min Lei、Ching-Fa Yao
DOI:10.1016/j.tet.2011.02.062
日期:2011.4
temperatures using various substitutedβ-nitrostyrenes. In addition, we report on the development of a convenient process for the regioselective synthesis of angular hydroxyiminodihydrofuroquinolinone catalyzed by base. 4-Hydroxycoumarin and 4-hydroxy-1-methylquinolin-2(1H)-one reacted smoothly with various nitroolefins to furnish C3-nitroalkylated hydroxycoumarin derivatives (by sonication and ‘on water’