1: 78 percent / Na2CO3 / methanol / 1.5 h / Ambient temperature 2: ammonia / methanol / Ambient temperature View Scheme

1: 83 percent / Et3N, DMAP / pyridine / 16 h / Ambient temperature 2: 94 percent / 2 M NaOH / methanol; dioxane / 0.08 h / 0 °C 3: 18.8 g / LiN3, PPh3, DEAD / dimethylformamide / 6 h / Ambient temperature 4: 68 percent / H2 / 10percent Pd/C / ethanol; CH2Cl2 5: 98 percent / Et3N / CH2Cl2 / 16 h / Ambient temperature 6: 94 percent / TBAF / tetrahydrofuran / 24 h View Scheme

1: NaHCO3 / methanol 2: 1.) (CF3SO2)2O, LiN3, pyridine, 2.) aq. NH3 View Scheme