Multi-step reaction with 9 steps
1.1: L-proline; diethyl 2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate / ethanol / 4 h / 20 °C / Inert atmosphere
2.1: trifluoroacetic acid / water / 3.66 h / 70 - 78 °C
3.1: trichlorophosphate / 6.66 h / 100 - 110 °C
4.1: toluene / 118 °C
5.1: n-butyllithium / tetrahydrofuran; hexane / 0.03 h / -70 °C
5.2: 0.08 h
5.3: 0.5 h
6.1: manganese(IV) oxide / 1,4-dioxane / 1 h / 85 °C / Inert atmosphere
7.1: n-butyllithium / tetrahydrofuran; hexane / 0.5 h / -40 °C
7.2: 0.75 h / -40 - 20 °C
8.1: formic acid; hydrogenchloride / water / 0.67 h / 20 °C
9.1: triethylamine / dichloromethane; water / 22 h / 20 - 35 °C
With
hydrogenchloride; manganese(IV) oxide; n-butyllithium; formic acid; diethyl 2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate; triethylamine; trifluoroacetic acid; L-proline; trichlorophosphate;
In
tetrahydrofuran; 1,4-dioxane; ethanol; hexane; dichloromethane; water; toluene;