1: 1.015 g / γ-collidine / CH2Cl2 / 1 h / -78 °C 2: 89 percent / DIBAL / CH2Cl2; hexane / 1 h / -78 °C 3: 93 percent / MsCl; LiCl; 2,6-lutidine / dimethylformamide / 2 h / -5 °C 4: 98 percent / TBAF / tetrahydrofuran / 3 h / 20 °C View Scheme