1: With lithium diisopropyl amide in tetrahydrofuran T=-78°C; 2 h; Inert atmosphere; 2: With MoO5*pyridine*HMPA in tetrahydrofuran T=-78°C; 2 h; Inert atmosphere; 3: With sodium hydrogencarbonate in tetrahydrofuran; methanol Inert atmosphere;