potassium carbonate in N,N-dimethyl-formamide Ambient temperature;

palladium bromide; tris(4-methoxyphenyl)-phosphine; silver benzoate in 1,4-dioxane T=125°C; 16 h; Inert atmosphere;

1.1: O-(2,4-dinitro-phenyl)-hydroxylamine / acetonitrile / 24 h / 40 °C / Inert atmosphere 2.1: sodium hydroxide / tetrahydrofuran; water / 0.08 h / 20 °C / Inert atmosphere 2.2: 5 h / Inert atmosphere 3.1: palladium bromide; tris(4-methoxyphenyl)-phosphine; silver benzoate / 1,4-dioxane / 16 h / 125 °C / Inert atmosphere View Scheme

1.1: sodium hydroxide / tetrahydrofuran; water / 0.08 h / 20 °C / Inert atmosphere 1.2: 5 h / Inert atmosphere 2.1: palladium bromide; tris(4-methoxyphenyl)-phosphine; silver benzoate / 1,4-dioxane / 16 h / 125 °C / Inert atmosphere View Scheme