Multi-step reaction with 6 steps
1.1: potassium carbonate / N,N-dimethyl-formamide; methanol / 72 h / 100 °C
2.1: sodium hydroxide / methanol / 24 h / Reflux
3.1: sulfuric acid; ammonium nitrate / 0.5 h / 0 °C
4.1: thionyl chloride / 2 h / 80 °C
4.2: 16 h / 20 °C / Cooling with ice
5.1: hydrogen; 5%-palladium/activated carbon / ethanol; ethyl acetate / 16 h / 20 °C / 760.05 Torr
6.1: O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate; N-ethyl-N,N-diisopropylamine / N,N-dimethyl-formamide / 0.17 h / Inert atmosphere
6.2: 4 h / Inert atmosphere
With
ammonium nitrate; thionyl chloride; sulfuric acid; 5%-palladium/activated carbon; hydrogen; potassium carbonate; O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate; N-ethyl-N,N-diisopropylamine; sodium hydroxide;
In
methanol; ethanol; ethyl acetate; N,N-dimethyl-formamide;
DOI:10.1002/anie.201504838