1: diisopropylamine With n-butyllithium in tetrahydrofuran; hexane T=-78 - 0°C; 0.166667 h; Inert atmosphere; 2: With pivalaldehyde in tetrahydrofuran; hexane T=0°C; 0.166667 h; Inert atmosphere; 3: trifluoro acetic acid methyl ester in tetrahydrofuran; hexane T=0 - 20°C; 2.16667 h; Inert atmosphere;

in acetonitrile Ambient temperature;