1: 6percent sodium amalgam / tetrahydrofuran; methanol / 3 h / Ambient temperature 2: 77 percent / 0.3N hydrochloric acid / acetonitrile / 2 h 3: 1) t-BuOK / 1) THF, 2) THF, 30 min 4: tetrabutylammonium fluoride / tetrahydrofuran / 48 h View Scheme

With  pyridine 15 h;  Ambient temperature;  Yield given;   

Multi-step reaction with 2 steps 1: 6percent sodium amalgam / tetrahydrofuran; methanol / 3 h / Ambient temperature2: 77 percent / 0.3N hydrochloric acid / acetonitrile / 2 h  

With  sodium amalgam in  tetrahydrofuran; methanol 3 h;  Ambient temperature;  Yield given;   

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