1: 75 percent / ethanol 2: 81 percent / H2SO4 3: 80 percent / hydrogen / 10percent Pd/C / acetic acid; methanol / 760 Torr / Ambient temperature 4: 35 percent / MnCl2*4H2O, 1N NaOH, leucine aminopeptidase / H2O / 40 h / 37 °C View Scheme

1: 75 percent / ethanol 2: 81 percent / H2SO4 3: 80 percent / hydrogen / 10percent Pd/C / acetic acid; methanol / 760 Torr / Ambient temperature 4: 35 percent / MnCl2*4H2O, 1N NaOH, leucine aminopeptidase / H2O / 40 h / 37 °C 5: 1) 0.5N NaOH / 1) dioxane, 16 h, RT, 2) ether 6: 52 percent / SOCl2 / 40 °C View Scheme