1: 64 percent / Hydrazine hydrate, KOH / bis-(2-methoxy-ethyl) ether 2: 70 percent / Pyridinium dichromate / pyridinium trifluoracetate / CH2Cl2 / 3 h / 0 °C 3: tetrahydrofuran / 1 h / 50 °C 4: 94 percent / KH / dioxane / 1 h / Heating 5: 90 percent / LiAlH4 6: TMEDA / tetrahydrofuran 7: 80 percent / Li/NH3 liq. / tetrahydrofuran 8: 1) BH3*SMe2, 2) alkaline aq. H2O2 9: 84 percent / Pyridinium dichromate / CH2Cl2 10: 2) THP group removal View Scheme