Multi-step reaction with 10 steps 1: pyridine / 24 h / Ambient temperature2: potassium acetate / 3 h / Heating3: ozone / CH2Cl2 / 0.08 h / -70 °C4: 87 percent / toluene / 15 h / Heating5: 100 percent / H2 / Pd-C (10percent) / ethyl acetate / 2 h6: 1.) LDA; / 1.) THF-10percent HMPA, -70 deg C, 30 min; 2.) -70 deg C, 10 min7: 88 percent / LiAlH4 / diethyl ether / 0.5 h / Ambient temperature8: 92 percent / PCC / CH2Cl2 / 1 h9: n-BuLi / tetrahydrofuran / 1 h / 0 °C10: PTSA / dioxane; H2O