Multi-step reaction with 8 steps
1: 3-ethyl-5-(2-hydroxyethyl)-4-methyl-1,3-thiazolium bromide; triethylamine / 70 °C / Inert atmosphere
2: methanol / Inert atmosphere
3: sodium hydroxide / 1,4-dioxane; ethanol; water / Reflux; Inert atmosphere
4: copper(l) iodide; potassium carbonate; L-proline / dimethyl sulfoxide / 80 °C / Inert atmosphere
5: palladium 10% on activated carbon; hydrogen / methanol; dichloromethane / 0.5 h / 20 °C / Inert atmosphere
6: pyridine / 0.5 h / 0 °C / Inert atmosphere
7: N-ethyl-N,N-diisopropylamine / N,N-dimethyl-formamide / Inert atmosphere
8: benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine / dichloromethane / 8 h / Inert atmosphere
With
pyridine; copper(l) iodide; palladium 10% on activated carbon; hydrogen; 3-ethyl-5-(2-hydroxyethyl)-4-methyl-1,3-thiazolium bromide; potassium carbonate; benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; triethylamine; N-ethyl-N,N-diisopropylamine; L-proline; sodium hydroxide;
In
1,4-dioxane; methanol; ethanol; dichloromethane; water; dimethyl sulfoxide; N,N-dimethyl-formamide;
2: Paal-Knorr pyrrole synthesis;
DOI:10.1021/jm300608w