1: 74.5 percent / pyridine, phosphorus oxychloride / 1 h / 110 °C 2: 1.) hydrazine hydrate / 1.) dioxane, reflux, 1 h, 2.) 45-50 deg C, 12 h View Scheme

hydrazine hydrate 1.) dioxane, reflux, 1 h, 2.) 45-50 deg C, 12 h; Yield given. Multistep reaction. Yields of byproduct given;