1: With diphenyl phosphoryl azide in 1,1-dimethylpropan-1-ol; triethylamine Curtius rearrangement; 8 h; Heating; 2: With hydrogenchloride in 1,4-dioxane; methanol T=0°C;

ethanol; hydrazine hydrate

pyridine; hydrogen sulfide; trichlorophosphate Yield given. Multistep reaction;