1: 68 percent / triethylamine / H2O / 0.33 h / Ambient temperature 2: 55 percent / neat (no solvent) / 1.5 h / 95 - 100 °C 3: 77 percent / 10percent aqueous potassium hydroxide / dioxane / 0.17 h / Ambient temperature 4: 71 percent / 1,2-dimethoxy-ethane / 1.) 30 min; 2.) room temperature, 3 h View Scheme

1: 55 percent / neat (no solvent) / 1.5 h / 95 - 100 °C 2: 77 percent / 10percent aqueous potassium hydroxide / dioxane / 0.17 h / Ambient temperature 3: 71 percent / 1,2-dimethoxy-ethane / 1.) 30 min; 2.) room temperature, 3 h View Scheme

1: 77 percent / 10percent aqueous potassium hydroxide / dioxane / 0.17 h / Ambient temperature 2: 71 percent / 1,2-dimethoxy-ethane / 1.) 30 min; 2.) room temperature, 3 h View Scheme

in ethylene glycol dimethyl ether 1.) 30 min; 2.) room temperature, 3 h;