1: 64 percent / 18 h / 40 °C 2: 70 percent / hydroxylamine / methanol; tetrahydrofuran / 7 h / Heating 3: 88 percent / pyridine / tetrahydrofuran / 1.5 h / Ambient temperature 4: 81 percent / acetic acid / 2 h / Heating 5: 25 percent / NaHCO3 / H2O; methanol / 2 h / Heating View Scheme

1: 48 percent / 18 h / 40 °C 2: 57 percent / hydroxylamine / methanol; tetrahydrofuran / 7 h / Heating View Scheme

Multi-step reaction with 3 steps 1: 64 percent / 18 h / 40 °C2: 70 percent / hydroxylamine / methanol; tetrahydrofuran / 7 h / Heating3: 88 percent / pyridine / tetrahydrofuran / 1.5 h / Ambient temperature  

Multi-step reaction with 4 steps 1: 64 percent / 18 h / 40 °C2: 70 percent / hydroxylamine / methanol; tetrahydrofuran / 7 h / Heating3: 88 percent / pyridine / tetrahydrofuran / 1.5 h / Ambient temperature4: 81 percent / acetic acid / 2 h / Heating  

Multi-step reaction with 3 steps 1: 64 percent / 18 h / 40 °C2: 70 percent / hydroxylamine / methanol; tetrahydrofuran / 7 h / Heating3: 91 percent / acetic acid / 18 h / Ambient temperature