Download full text in PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... A new heterocycle, 5-butyl-1-methyl-1H-imidazo[4,5-c]quinolin-4(5H)-one has been synthesized using palladium-catalyzed cyclization. A yield of the cyclization was optimized by changing base, additive and reaction temperature. ... A new heterocycle, 5-butyl-1-methyl-1H- ...