1: 96 percent / 10percent DMAP / pyridine / 3 h / 70 °C 2: 89 percent / H2 / Lindlar catalyst 3: 72 percent / BF3*Et2O 4: H2 / PtO2 5: KOH / tetrahydrofuran; methanol; H2O / 48 h / 25 °C View Scheme