1: 80 percent / NaN(SiMe3)2 / tetrahydrofuran / -100 deg C to RT 2: TsOH / tetrahydrofuran; H2O / 0.17 h 3: 50 percent / NaN(SiMe3)2 / tetrahydrofuran / -100 deg C to RT 4: 92 percent / LiOH / tetrahydrofuran / 15 h / Ambient temperature View Scheme

1: 80 percent / NaN(SiMe3)2 / tetrahydrofuran / -100 deg C to RT 2: TsOH / tetrahydrofuran; H2O / 0.17 h 3: 50 percent / NaN(SiMe3)2 / tetrahydrofuran / -100 deg C to RT View Scheme