1: 95 percent / NaOH / methanol; H2O 2: 95 percent / EtO2C-N=N-CO2Et, ZnCl2, PBu3 / 3 h / 20 °C 3: 90 percent / K2CO3 / methanol / 1 h / 20 °C 4: 81 percent / Na / NH3 View Scheme

1: 99 percent / NaOH / methanol; H2O 2: 100 percent / Et3N / tetrahydrofuran 3: 97 percent / K2CO3 / methanol / 1 h / 20 °C 4: 77 percent / Na / liquid ammonia 5: 91 percent / NaBH4 View Scheme

1: 95 percent / NaOH / methanol; H2O 2: 95 percent / EtO2C-N=N-CO2Et, ZnCl2, PBu3 / 3 h / 20 °C 3: 90 percent / K2CO3 / methanol / 1 h / 20 °C 4: 81 percent / Na / NH3 5: 95 percent / NaBH4 View Scheme