1.1: hydrogenchloride / diethyl ether 2.1: diethyl ether / 1.5 h / 170 °C 3.1: sodium hydroxide; dihydrogen peroxide / water / 0.67 h / 100 °C 3.2: pH 8 3.3: pH 3 4.1: diethyl ether; methanol / 0.17 h / 25 °C 5.1: 2 h / 125 °C 6.1: trichlorophosphate / N,N-dimethyl-formamide / 1 h / 100 °C View Scheme

1.1: sodium hydroxide; dihydrogen peroxide / water / 0.67 h / 100 °C 1.2: pH 8 1.3: pH 3 2.1: diethyl ether; methanol / 0.17 h / 25 °C 3.1: 2 h / 125 °C 4.1: trichlorophosphate / N,N-dimethyl-formamide / 1 h / 100 °C View Scheme

1.1: diethyl ether / 1.5 h / 170 °C 2.1: sodium hydroxide; dihydrogen peroxide / water / 0.67 h / 100 °C 2.2: pH 8 2.3: pH 3 3.1: diethyl ether; methanol / 0.17 h / 25 °C 4.1: 2 h / 125 °C 5.1: trichlorophosphate / N,N-dimethyl-formamide / 1 h / 100 °C View Scheme

1: 2 h / 125 °C 2: trichlorophosphate / N,N-dimethyl-formamide / 1 h / 100 °C View Scheme

1: nitric acid / 0.17 h / 0 °C 2: sulfuric acid / 110 °C / |Reflux 3: palladium 10 on activated carbon; hydrogen / ethanol / 12 h / 20 °C 4: sodium methylate / methanol; N,N-dimethyl-formamide / 24 h / 150 °C 5: trichlorophosphate; triethylamine / toluene / 3.5 h / 102 °C / |Inert atmosphere View Scheme