thiolacetic acid potassium salt in N,N-dimethyl acetamide T=150 - 160°C; 4 h;

1: 1.) LDA / 1.) THF, -78 deg C, 30 min, 2.) THF, HMPA, a) -78 deg C, 4 h, b) RT, overnight 2: 69 percent / potassium thioacetate / N,N-dimethyl-acetamide / 4 h / 150 - 160 °C View Scheme