Multi-step reaction with 14 steps
1.1: potassium carbonate / methanol / 0 - 20 °C
2.1: sulfuric acid; formic acid / 100 °C
3.1: sulfuric acid / 100 °C / Reflux
4.1: trifluoroacetic acid / tetrahydrofuran / 0 - 20 °C
4.2: Reflux
5.1: acetic anhydride / 90 °C
5.2: -78 - 20 °C
6.1: palladium(II) hydroxide / methanol / 20 °C
7.1: triethylamine / tetrahydrofuran / 0 - 20 °C
8.1: triethylamine; diphenyl phosphoryl azide / toluene / 3 h / 75 °C
8.2: 2 h / 110 °C
9.1: hydrogenchloride / 1,4-dioxane / 20 h / 20 °C
10.1: N-ethyl-N,N-diisopropylamine; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride / N,N-dimethyl-formamide / 156 h / 20 °C
11.1: Chiralpak AD column / hexane; isopropyl alcohol / Resolution of racemate
12.1: hydrogen; 20% palladium hydroxide-activated charcoal / methanol / 5 h / 20 °C
13.1: johnphos; sodium t-butanolate; (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride / toluene / 4 h / 65 °C / Inert atmosphere; Sealed tube
14.1: trifluoroacetic acid / dichloromethane / 3 h / 20 °C
With
hydrogenchloride; (1,1'-bis(diphenylphosphino)ferrocene)palladium(II) dichloride; formic acid; sulfuric acid; diphenyl phosphoryl azide; 20% palladium hydroxide-activated charcoal; hydrogen; palladium(II) hydroxide; acetic anhydride; potassium carbonate; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; triethylamine; N-ethyl-N,N-diisopropylamine; trifluoroacetic acid; johnphos; sodium t-butanolate;
In
tetrahydrofuran; 1,4-dioxane; methanol; hexane; dichloromethane; N,N-dimethyl-formamide; isopropyl alcohol; toluene;
8.2: |Curtius Rearrangement;
DOI:10.1021/acs.jmedchem.5b01995