1: 63 percent / Et3N / dioxane / 4 h / Ambient temperature 2: 77 percent / various solvent(s) / 1 h / 230 - 240 °C 3: 1.) NaH / 1.) DMF, RT, 5 min, 2.) DMF, RT, overnight View Scheme

1: 77 percent / various solvent(s) / 1 h / 230 - 240 °C 2: 1.) NaH / 1.) DMF, RT, 5 min, 2.) DMF, RT, overnight View Scheme

1: 49 percent / dioxane / Heating 2: 77 percent / various solvent(s) / 1 h / 230 - 240 °C 3: 1.) NaH / 1.) DMF, RT, 5 min, 2.) DMF, RT, overnight View Scheme

sodium hydride 1.) DMF, RT, 5 min, 2.) DMF, RT, overnight; Multistep reaction;