1.1: 70 percent / TBDMS-OBt / tetrahydrofuran / 0.5 h / 20 °C 2.1: 81 percent / 4-aminomethylpiperidine / CH2Cl2 / 0.5 h 3.1: 79 percent / TBDMS-OBt / tetrahydrofuran / 0.5 h / 20 °C 4.1: 85 percent / 4-aminomethylpiperidine / CH2Cl2 / 0.5 h 5.1: 72 percent / TBDMS-OBt / tetrahydrofuran / 0.5 h / 20 °C 6.1: aq. HCOOH / Pd/C / methanol / 3 h / 20 °C 6.2: 80 percent / aq. NaHCO3 / 0.33 h View Scheme