1: 87 percent / sodium azide / dimethylformamide 2: 91 percent / sodium hydride, tetrabutylammonium iodide / tetrahydrofuran 3: 67 percent / hydrogen chloride 5: tin(II)-chloride / methanol 6: sodium acetate / ethanol 8: trifluoroacetic acid / dioxane; H2O 9: sodium borohydride / ethanol 10: hydrogen / palladium black / acetic acid View Scheme