silica-supported selenamide; dihydrogen peroxide in tert-butyl alcohol T=55°C; 20 h;

bis-triphenylphosphine-palladium(II) chloride; 2,2'-bibenzo[d]oxazole; p-benozquinone; lithium tert-butylate in 1,4-dioxane T=100°C; 8 h; Inert atmosphere; regioselective reaction;