1: 99 percent / pyridine / 16 h / 45 °C 2: 99 percent / NaH / tetrahydrofuran / 24 h 3: 96 percent / H2 / Pd/C / CH2Cl2 / 48 h / 20 °C / 38000 Torr 4: NaH / tetrahydrofuran / 72 h / 20 °C View Scheme

1: 99 percent / NaH / tetrahydrofuran / 24 h 2: 96 percent / H2 / Pd/C / CH2Cl2 / 48 h / 20 °C / 38000 Torr 3: NaH / tetrahydrofuran / 72 h / 20 °C View Scheme

sodium hydride in tetrahydrofuran T=20°C; Condensation; 72 h;