1: 81 percent / aq. TFA / CH2Cl2 / 0 °C 2: 75 percent / Et3N / CH2Cl2 / 1.5 h / 0 °C 3: Et3N / CH2Cl2 / 0.5 h / 0 °C 4: 0.314 g / lithium aluminum hydride / tetrahydrofuran / 4 h / Heating 5: 64 percent / O3; aq. NaOH / CH2Cl2; methanol / -78 - 20 °C 6: 90 percent / H2 / Pd/C / ethanol View Scheme