triethylamine hydrofluoric acid in tetrahydrofuran 2 h; Ambient temperature;

Multi-step reaction with 3 steps 1: 95 percent / imidazole / dimethylformamide / Ambient temperature2: 1.) n-BuLi, i-Pr2NH / 1.) THF, -76 deg C, 0.5 h, 2.) THF, -76 deg C, 1 h3: 48 percent / 1percent NaOH, Raney nickel W-2 / tetrahydrofuran / 5 h / Heating