1: 69 percent / K2CO3 / acetonitrile / 24 h / Ambient temperature 2: 2.) K2CO3 / 1.) reflux, 2 h, 2.) DMF, RT, 16 h 3: 81 percent / K2CO3 / dimethylformamide / 8 h / Ambient temperature 4: KOH / ethanol; H2O / 0.67 h / Heating 5: copper bronze, quinoline / 185 °C 6: 1.) C-200 (BaCO3*0.8H2O), 2.) H2O / 1.) THF, 2.) THF, reflux, 1 h 7: KOH / ethanol; H2O / 0.67 h / Heating 8: 34 percent / polyphosphoric acid silyl ester (PPSE) / 22 h / 120 °C View Scheme

1: 1.) C-200 (BaCO3*0.8H2O), 2.) H2O / 1.) THF, 2.) THF, reflux, 1 h 2: KOH / ethanol; H2O / 0.67 h / Heating 3: 34 percent / polyphosphoric acid silyl ester (PPSE) / 22 h / 120 °C View Scheme

1: 2.) K2CO3 / 1.) reflux, 2 h, 2.) DMF, RT, 16 h 2: 81 percent / K2CO3 / dimethylformamide / 8 h / Ambient temperature 3: KOH / ethanol; H2O / 0.67 h / Heating 4: copper bronze, quinoline / 185 °C 5: 1.) C-200 (BaCO3*0.8H2O), 2.) H2O / 1.) THF, 2.) THF, reflux, 1 h 6: KOH / ethanol; H2O / 0.67 h / Heating 7: 34 percent / polyphosphoric acid silyl ester (PPSE) / 22 h / 120 °C View Scheme

1: 81 percent / K2CO3 / dimethylformamide / 8 h / Ambient temperature 2: KOH / ethanol; H2O / 0.67 h / Heating 3: copper bronze, quinoline / 185 °C 4: 1.) C-200 (BaCO3*0.8H2O), 2.) H2O / 1.) THF, 2.) THF, reflux, 1 h 5: KOH / ethanol; H2O / 0.67 h / Heating 6: 34 percent / polyphosphoric acid silyl ester (PPSE) / 22 h / 120 °C View Scheme

1: KOH / ethanol; H2O / 0.67 h / Heating 2: copper bronze, quinoline / 185 °C 3: 1.) C-200 (BaCO3*0.8H2O), 2.) H2O / 1.) THF, 2.) THF, reflux, 1 h 4: KOH / ethanol; H2O / 0.67 h / Heating 5: 34 percent / polyphosphoric acid silyl ester (PPSE) / 22 h / 120 °C View Scheme

1: KOH / ethanol; H2O / 0.67 h / Heating 2: 34 percent / polyphosphoric acid silyl ester (PPSE) / 22 h / 120 °C View Scheme