1: 58 percent / N-methylmorpholine; isobutyl chloroformate; sodium borohydride / tetrahydrofuran / 3 h / -20 °C 2: 95 percent / iodine; triphenylphosphane; imidazole / CH2Cl2 / 2 h 3: 77 percent / H2 / Pd/C / methanol / 4 h View Scheme