1: 95 percent / iPr2NEt / dimethylsulfoxide / 3 h / 80 °C 2: 70 percent / H2 / 5percent Pd/C / dioxane / Ambient temperature 3: H2NNH2*H2O / ethanol / 2 h / Heating View Scheme

1: 70 percent / H2 / 5percent Pd/C / dioxane / Ambient temperature 2: H2NNH2*H2O / ethanol / 2 h / Heating View Scheme

hydrazine hydrate in ethanol 2 h; Heating;