1: NaBH4; CeCl3*7H2O / methanol / 20 °C 2: 93 percent / pyridine 3: aq. TFA 4: thionyl chloride; Et3N 5: 72 percent / dimethylformamide / 90 °C 6: 90 percent / pyridine 7: KMnO4; MgSO4 8: pyridine 9: 100 percent / NH3 / methanol View Scheme