1: 1-(N-phenylcarbamyl)propan-2-one With tetrabutylammomium bromide; potassium carbonate in N,N-dimethyl-formamide T=20°C; 0.5 h; 2: carbon disulfide in N,N-dimethyl-formamide T=20°C; 2 h; 3: dimethyl sulfate in N,N-dimethyl-formamide T=20°C; 4.5 h;

potassium carbonate 1) DMF; Yield given. Multistep reaction;

1: 1,2-dichloro-benzene / 0.4 h / |Reflux 2: sulfuric acid / 4 h / |Reflux View Scheme