1: potassium carbonate / 0 - 20 °C 2: triethylamine / dichloromethane / 0 °C 3: potassium formiate; formic acid / acetic anhydride / 100 °C View Scheme

1: potassium carbonate / 0 - 20 °C 2: triethylamine / dichloromethane / 0 °C 3: potassium formiate; formic acid / acetic anhydride / 100 °C 4: .alpha.,.alpha.,.alpha.-trichloroacetamide; dihydrogen peroxide; dipotassium hydrogenphosphate / dichloromethane / 10 - 20 °C View Scheme

in methanol; hexane; toluene T=20°C;

potassium carbonate T=0 - 20°C;