1.1: 81 percent / 1M Bu4NF / tetrahydrofuran / 4 h / 20 °C 2.1: 92 percent / Et3N / CH2Cl2 / 20 °C 3.1: 85 percent / NaN3 / dimethylformamide / 12 h / 85 °C 4.1: Acid hydrolysis 5.1: imidazole; Et3N / CH2Cl2 / 0.75 h 6.1: 72 percent / (COCl)2; DMSO; Et3N / 2 h 7.1: aq. HF / 20 °C 7.2: H2 / 10percent Pd/C / methanol / 2 h / 760.05 Torr View Scheme