1.1: methanesulfonyl chloride; triethylamine / acetonitrile; methanol / 0 - 20 °C 1.2: |Reflux 2.1: potassium carbonate / anhydrous xylene / 40 h / |Reflux View Scheme

1: With methanesulfonyl chloride; triethylamine in methanol; acetonitrile T=0 - 20°C; 2: With ammonium hydroxide Reflux;