1.1: 70 percent / NaOH / dioxane / 3 h / 20 °C 2.1: NaH / dimethylformamide / 0.17 h / 0 °C 2.2: 74 percent / dimethylformamide / 5 h / 20 °C 3.1: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 4.1: 1.95 g / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / CH2Cl2 / 18 h / 20 °C 5.1: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 6.1: 2.6 g / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / CH2Cl2 / 18 h / 20 °C 7.1: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 8.1: 411 mg / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / dimethylformamide / 18 h / 20 °C 9.1: 96 percent / H2 / 10 percent Pd/C / dimethylformamide / 18 h / 20 °C 10.1: 75 percent / Et3N; SO3*pyridine / dimethylsulfoxide / 1 h / 20 °C 11.1: 2.3 mg / NaBH4 / methanol / 2 h / 20 °C 12.1: 6N HCl / 18 h / 105 °C View Scheme

1.1: NaH / dimethylformamide / 0.17 h / 0 °C 1.2: 74 percent / dimethylformamide / 5 h / 20 °C 2.1: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 3.1: 1.95 g / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / CH2Cl2 / 18 h / 20 °C 4.1: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 5.1: 2.6 g / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / CH2Cl2 / 18 h / 20 °C 6.1: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 7.1: 411 mg / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / dimethylformamide / 18 h / 20 °C 8.1: 96 percent / H2 / 10 percent Pd/C / dimethylformamide / 18 h / 20 °C 9.1: 75 percent / Et3N; SO3*pyridine / dimethylsulfoxide / 1 h / 20 °C 10.1: 2.3 mg / NaBH4 / methanol / 2 h / 20 °C 11.1: 6N HCl / 18 h / 105 °C View Scheme

1: 1.95 g / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / CH2Cl2 / 18 h / 20 °C 2: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 3: 2.6 g / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / CH2Cl2 / 18 h / 20 °C 4: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 5: 411 mg / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / dimethylformamide / 18 h / 20 °C 6: 96 percent / H2 / 10 percent Pd/C / dimethylformamide / 18 h / 20 °C 7: 75 percent / Et3N; SO3*pyridine / dimethylsulfoxide / 1 h / 20 °C 8: 2.3 mg / NaBH4 / methanol / 2 h / 20 °C 9: 6N HCl / 18 h / 105 °C View Scheme

1: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 2: 1.95 g / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / CH2Cl2 / 18 h / 20 °C 3: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 4: 2.6 g / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / CH2Cl2 / 18 h / 20 °C 5: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 6: 411 mg / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / dimethylformamide / 18 h / 20 °C 7: 96 percent / H2 / 10 percent Pd/C / dimethylformamide / 18 h / 20 °C 8: 75 percent / Et3N; SO3*pyridine / dimethylsulfoxide / 1 h / 20 °C 9: 2.3 mg / NaBH4 / methanol / 2 h / 20 °C 10: 6N HCl / 18 h / 105 °C View Scheme

1: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 2: 2.6 g / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / CH2Cl2 / 18 h / 20 °C 3: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 4: 411 mg / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / dimethylformamide / 18 h / 20 °C 5: 96 percent / H2 / 10 percent Pd/C / dimethylformamide / 18 h / 20 °C 6: 75 percent / Et3N; SO3*pyridine / dimethylsulfoxide / 1 h / 20 °C 7: 2.3 mg / NaBH4 / methanol / 2 h / 20 °C 8: 6N HCl / 18 h / 105 °C View Scheme

1: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 2: 4.46 g / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / CH2Cl2 / 18 h / 20 °C 3: trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C 4: 435 mg / Et3N; 1-hydroxybenzotriazole hydrate; water soluble carbodiimide hydrochloride / dimethylformamide / 18 h / 20 °C 5: 99 percent / H2 / 10 percent Pd/C / dimethylformamide / 18 h / 20 °C 6: 51 percent / Et3N; SO3*pyridine / dimethylsulfoxide / 1 h / 20 °C 7: 2.3 mg / NaBH4 / methanol / 20 °C 8: 6N HCl / 18 h / 105 °C View Scheme

lithium aluminium tetrahydride

1: 2.3 mg / NaBH4 / methanol / 2 h / 20 °C 2: 6N HCl / 18 h / 105 °C View Scheme

1: 2.3 mg / NaBH4 / methanol / 20 °C 2: 6N HCl / 18 h / 105 °C View Scheme

1: 75 percent / Et3N; SO3*pyridine / dimethylsulfoxide / 1 h / 20 °C 2: 2.3 mg / NaBH4 / methanol / 2 h / 20 °C 3: 6N HCl / 18 h / 105 °C View Scheme