potassium tert-butylate in dimethyl sulfoxide 7 h; Ambient temperature;

1: 23 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene / dimethylformamide / 17 h / 140 °C 2: 44 percent / potassium tert-butoxide / dimethylsulfoxide / 7 h / Ambient temperature View Scheme

1: 23 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene / dimethylformamide / 17 h / 140 °C 2: 44 percent / potassium tert-butoxide / dimethylsulfoxide / 7 h / Ambient temperature View Scheme