1: imidazole / CH2Cl2 / 0 - 20 °C 2: 80 percent / tetrahydrofuran / 20 h / Heating View Scheme

1.) toluene, 4 h, 60 deg C; 2.) toluene, ethanol, 12 h, reflux; Yield given. Multistep reaction;

1: diphenyl phosphoryl azide; triethylamine / acetone / 15 h / 20 °C / Inert atmosphere 2: toluene / 1 h / Reflux; Inert atmosphere 3: 3-methyl-1-phenyl-2-phospholene-1-oxide / toluene / Reflux; Inert atmosphere View Scheme