1: 84 percent / H2 / 10 percent Pd/C / methanol / 2 h / 20 °C / 3750.3 Torr 2: 75 percent / trifluoroacetic acid; acetic acid / 1 h / 100 °C 3: 74 percent / H2 / 10 percent Pd/C / tetrahydrofuran / 4 h / 20 °C / 3750.3 Torr 4: 84 percent / Na; liquid NH3 / tetrahydrofuran / 0.17 h View Scheme

1: N-Boc-N-methyl-methanesulfonamide With potassium tert-butylate in tetrahydrofuran T=-78°C; 1 h; 2: 1-benzyl-1H-indole-5-carbaldehyde in tetrahydrofuran T=-78 - 0°C;

1.1: 75 percent / DDQ / CH2Cl2 / 3 h / 0 °C 2.1: t-BuOK / tetrahydrofuran / 1 h / -78 °C 2.2: 73 percent / tetrahydrofuran / -78 - 0 °C View Scheme

hydrogen; palladium on activated charcoal in methanol T=20°C; P=3750.3 Torr; 2 h;

1: 84 percent / H2 / 10 percent Pd/C / methanol / 2 h / 20 °C / 3750.3 Torr 2: 75 percent / trifluoroacetic acid; acetic acid / 1 h / 100 °C View Scheme