1: 96 percent / diisopropyl carbodiimide; DMAP / CH2Cl2 / 3 h / 20 °C 2: 77 percent / CH2Cl2 / Mo[N(t-Bu)(p-PhF)]3/CH2Cl2 / toluene / 16 h / 80 °C 3: 86 percent / H2; quinoline / Lindlar catalyst / hexane / 2 h / 760.05 Torr 4: 88 percent / aq. HF / acetonitrile / 1 h View Scheme