tetrabutyl ammonium fluoride in tetrahydrofuran 48 h; Yield given;

Multi-step reaction with 2 steps 1: 77 percent / 0.3N hydrochloric acid / acetonitrile / 2 h2: 1) t-BuOK / 1) THF, 2) THF, 30 min  

Multi-step reaction with 4 steps 1: pyridine / 15 h / Ambient temperature2: 6percent sodium amalgam / tetrahydrofuran; methanol / 3 h / Ambient temperature3: 77 percent / 0.3N hydrochloric acid / acetonitrile / 2 h4: 1) t-BuOK / 1) THF, 2) THF, 30 min  

Multi-step reaction with 3 steps 1: 6percent sodium amalgam / tetrahydrofuran; methanol / 3 h / Ambient temperature2: 77 percent / 0.3N hydrochloric acid / acetonitrile / 2 h3: 1) t-BuOK / 1) THF, 2) THF, 30 min