triethylamine; trichlorophosphate T=150°C; 0.5 h; Microwave irradiation;

1: carbonyldiimidazole / tetrahydrofuran / Heating 2: POCl3, Et3N / Heating View Scheme

1: NH2OH*HCl, aq. NaOH 2: carbonyldiimidazole / tetrahydrofuran / Heating 3: POCl3, Et3N / Heating View Scheme

1.1: sulfuric acid / ethanol; methanol / 24 h / Reflux 2.1: hydroxylamine hydrochloride; sodium hydroxide / ethanol; water / 24 h / 20 °C / Cooling with ice; Inert atmosphere 2.2: 0.5 h / Reflux 3.1: thionyl chloride / 1,4-dioxane; tetrahydrofuran / 30 °C / Inert atmosphere 3.2: 30 °C 3.3: pH 2 4.1: triethylamine; trichlorophosphate / 0.5 h / 150 °C / Microwave irradiation View Scheme