1: 87 percent / NaOMe, TiCl3 / methanol / 1.5 h / 20 °C 2: 92.3 percent / BF3*Et2O / 0 °C 3: 93 percent / Ra-Ni / methanol / 3 h / 20 °C View Scheme

titanium(III) chloride; sodium methylate in methanol T=20°C; 1.5 h;