potassium carbonate in N,N-dimethyl-formamide T=20°C;

1.1: N,O-bis(trimethylsilyl)acetamide / acetonitrile / 20 °C 1.2: 90 percent / I2 / acetonitrile / Heating 2.1: 100 percent / potassium carbonate / dimethylformamide / 20 °C View Scheme