1: With Lawesson's reagent; boron trifluoride diethyl etherate in tetrahydrofuran; ethylene glycol dimethyl ether T=55°C; 14 h; Inert atmosphere; 2: With sodium hydrogencarbonate in tetrahydrofuran; ethylene glycol dimethyl ether T=20°C; 0.333333 h; Inert atmosphere;

in water T=40°C; 6 h;

T=20°C; 21 h;