1: 46 percent / NaN3 / dimethylformamide / 48 h / thermodynamic conditions 2: 30 percent / pyridine / CH2Cl2 3: 99 percent / acetic acid, water 4: 76 percent / imidazole, / dimethylformamide 5: 95 percent / pyridine / CH2Cl2 6: 99 percent / H2 / palladium black / ethyl acetate 7: 74 percent / sodium acetate / methanol 8: lithium triethylborohydride / tetrahydrofuran 9: 1percent HCl / methanol View Scheme