1: With Lawesson's reagent in tetrahydrofuran; ethylene glycol dimethyl ether T=50°C; 3 h; Inert atmosphere; 2: With sodium hydrogencarbonate in tetrahydrofuran; ethylene glycol dimethyl ether T=20°C; 0.333333 h; Inert atmosphere; regioselective reaction;

palladium diacetate; sodium carbonate in isobutyramide T=120°C; Inert atmosphere;

sulfuric acid in water T=20°C; Reflux;