pyridine T=20°C;

1.1: NaH / tetrahydrofuran / 4 h / 20 °C 1.2: 77 percent / tetrahydrofuran / 20 °C 2.1: Li; naphthalene / tetrahydrofuran / 1.2 h / 0 °C 2.2: tetrahydrofuran / 0.5 h / 0 °C 3.1: HCl / methanol / 20 °C 4.1: 76 percent / pyridine / 20 °C View Scheme

1: HCl / methanol / 20 °C 2: 76 percent / pyridine / 20 °C View Scheme