1: 62 percent / lithium aluminum hydride / tetrahydrofuran / 18 h / Ambient temperature 2: 18 percent / H2SO4, fuming HNO3 / 3 h / 110 °C 3: H2 / 10percent Pd/C / ethanol / 18 h / 2585.7 Torr / Ambient temperature 4: ethanol / 18 h / 110 °C View Scheme

Multi-step reaction with 2 steps 1: 62 percent / lithium aluminum hydride / tetrahydrofuran / 18 h / Ambient temperature2: 18 percent / H2SO4, fuming HNO3 / 3 h / 110 °C