1.1: 98 percent / NaN3 / dimethylformamide / 48 h / 100 °C 2.1: 78.4 percent / TFA / H2O / 24 h / 20 °C 3.1: 100 percent / imidazole / dimethylformamide / 20 h / 20 °C 4.1: H2 / Raney nickel / methanol / 19 h / 2587.71 Torr 5.1: 68 percent / Et3N / methanol / 2 h / 20 °C 6.1: 92 percent / tetrabutylammonium fluoride trihydrate / tetrahydrofuran / 20 °C 7.1: H2; HCl / Pd-C / methanol / 14 h / 2587.71 Torr 7.2: 92 percent / Amberlite IRA-400 (OH1- form) / methanol View Scheme