Multi-step reaction with 8 steps
1.1: sulfuric acid / 1 h / 0 °C / Inert atmosphere
2.1: pyridine; dmap; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride / Inert atmosphere
3.1: lithium hydroxide monohydrate / water; acetonitrile; 1,4-dioxane / 0.67 h / 0 - 20 °C / Inert atmosphere
4.1: oxalyl dichloride; N,N-dimethyl-formamide / tetrahydrofuran / 1.25 h / 0 °C / Inert atmosphere
5.1: n-butyllithium / tetrahydrofuran / 0.33 h / -78 °C / Inert atmosphere
5.2: 1 h / -78 °C / Inert atmosphere
6.1: lithium hexamethyldisilazane / tetrahydrofuran / 0.5 h / -78 °C / Acidic conditions
6.2: -78 - -25 °C / Inert atmosphere
7.1: lithium hydroxide monohydrate; dihydrogen peroxide / water; tetrahydrofuran / 0.75 h / 0 °C / Inert atmosphere
8.1: ((3H-[1,2,3]triazolo[4,5-b]pyridin-3-yl)oxy)tri(pyrrolidin-1-yl)phosphonium hexafluorophosphate(V); N-ethyl-N,N-diisopropylamine / N,N-dimethyl-formamide / 4 h / Inert atmosphere
With
pyridine; dmap; n-butyllithium; oxalyl dichloride; lithium hydroxide monohydrate; sulfuric acid; dihydrogen peroxide; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine; N,N-dimethyl-formamide; ((3H-[1,2,3]triazolo[4,5-b]pyridin-3-yl)oxy)tri(pyrrolidin-1-yl)phosphonium hexafluorophosphate(V); lithium hexamethyldisilazane;
In
tetrahydrofuran; 1,4-dioxane; water; N,N-dimethyl-formamide; acetonitrile;
DOI:10.1055/s-0037-1610310