sodium hydroxide in 1,4-dioxane 6 h; Ambient temperature;

With  DBN in  N,N-dimethyl-formamide 30 h;  Heating;   

Multi-step reaction with 2 steps 1: 64 percent / 0.1 M HCl / 15 h / Heating2: 45 percent / 1,5-diazabicyclo<4.3.0>non-5-ene (DBN) / dimethylformamide / 30 h / Heating