Multi-step reaction with 11 steps
1.1: sulfuric acid / dichloromethane / 0.5 h / 0 - 5 °C
1.2: 5 °C
2.1: thionyl chloride / N,N-dimethyl-formamide; toluene / 85 - 90 °C / Inert atmosphere
3.1: N-ethyl-N,N-diisopropylamine / toluene / 4.5 h / 90 - 95 °C
4.1: toluene / 1.5 h / 20 °C / Cooling
5.1: potassium carbonate / N,N-dimethyl-formamide / 20 °C
6.1: 1H-imidazole / dichloromethane
7.1: tetrakis(triphenylphosphine) palladium(0) / tetrahydrofuran / 6 h / 40 °C / Inert atmosphere
8.1: sodium hydroxide; water / 55 °C
8.2: 10 - 15 °C / pH 3 - 3.5
9.1: water; methanol / 20 °C / Inert atmosphere; Reflux
10.1: hydrogenchloride / ethyl acetate; water / 10 - 15 °C / pH 3 - 8.5
11.1: 1H-imidazole / dichloromethane / 3 h / 20 °C
With
1H-imidazole; hydrogenchloride; thionyl chloride; sulfuric acid; water; potassium carbonate; N-ethyl-N,N-diisopropylamine; sodium hydroxide;
tetrakis(triphenylphosphine) palladium(0);
In
tetrahydrofuran; methanol; dichloromethane; water; ethyl acetate; N,N-dimethyl-formamide; toluene;