potassium carbonate in diethylene glycol dimethyl ether 20 h; Heating;

1: 1.) anhydrous aluminum chloride, sodium chloride, 2.) hydrochloric acid / 1.) 190 deg C, 2 min, 2.) heating, 2 h 2: 81 percent / anhydrous potassium carbonate / dimethylformamide; butan-2-one / 3 h / Heating View Scheme

1: 1.) anhydrous aluminum chloride, sodium chloride, 2.) hydrochloric acid / 1.) 190 deg C, 2 min, 2.) heating, 2 h 2: 81 percent / anhydrous potassium carbonate / dimethylformamide; butan-2-one / 3 h / Heating View Scheme

1,3-dibromo-5,5-dimethyl-hydantoin in tetrachloromethane 4 h; Heating;