in ethanol 2 h; Ambient temperature;

1: 72 percent / dimethyldioxirane / acetone; CH2Cl2 / 25 °C 2: 79 percent / 2N methanol. NH3 / 25 °C View Scheme

1: triethylamine / H2O / 5 h / 70 °C 2: 34.7 g / pyridine / 5 h / Ambient temperature 3: 89 percent / acetonitrile / 1.5 h / Ambient temperature 4: 93 percent / ethanol / 2 h / Ambient temperature View Scheme

1: diphenyl carbonate, sodium hydrogen carbonate / hexamethylphosphoric acid triamide / 0.33 h / 150 °C 2: triethylamine / H2O / 5 h / 70 °C 3: 34.7 g / pyridine / 5 h / Ambient temperature 4: 89 percent / acetonitrile / 1.5 h / Ambient temperature 5: 93 percent / ethanol / 2 h / Ambient temperature View Scheme

1: 34.7 g / pyridine / 5 h / Ambient temperature 2: 89 percent / acetonitrile / 1.5 h / Ambient temperature 3: 93 percent / ethanol / 2 h / Ambient temperature View Scheme

1: 89 percent / acetonitrile / 1.5 h / Ambient temperature 2: 93 percent / ethanol / 2 h / Ambient temperature View Scheme