1: With lithium diisopropyl amide in tetrahydrofuran T=-78°C; 1.16667 h; Inert atmosphere; 2: With 1,2-dibromo-1,1,2,2-tetrachloroethane in tetrahydrofuran T=-78°C; 2.46667 h; Inert atmosphere;

in methanol 18 h; Ambient temperature;