1: 2,4,6-trimethoxypyrimidine With n-butyllithium in tetrahydrofuran; diethyl ether; hexane T=-30°C; 1.5 h; Inert atmosphere; 2: formic acid ethyl ester in tetrahydrofuran; diethyl ether; hexane T=-70°C; 1 h; Inert atmosphere; 3: With hydrogenchloride in tetrahydrofuran; diethyl ether; ethanol; hexane; water T=-70 - 0°C; Inert atmosphere;