Multi-step reaction with 11 steps
1.1: n-butyllithium / tert-butyl methyl ether; hexanes / 3 h / -78 °C
1.2: 0.75 h / -60 °C
2.1: potassium hydroxide / methanol / 12 h / 20 °C
3.1: boron trifluoride diethyl etherate / tetrahydrofuran / 0.5 h / -60 °C
3.2: -60 - 45 °C / Inert atmosphere
4.1: ChiralPak IA / carbon dioxide; methanol / Resolution of racemate
5.1: boron tribromide / dichloromethane / 18.16 h / -78 - 20 °C
5.2: 0.5 h / 0 - 20 °C
6.1: sodium hydride / tetrahydrofuran; mineral oil / 1 h / -40 - -10 °C
6.2: 17 h / -40 - 20 °C
7.1: piperidine / dichloromethane / 16 h / 20 °C
8.1: potassium carbonate / N,N-dimethyl-formamide / 23 h / 60 °C
9.1: potassium carbonate / tetrakis(triphenylphosphine) palladium(0) / 1,4-dioxane; water / 0.67 h / 95 °C / microwave irradiation; sealed tube
10.1: hydrogenchloride; water / 1,4-dioxane / 1 h / 20 °C
11.1: hydrogenchloride; water / 1,4-dioxane / 16 h / 20 °C
With
piperidine; hydrogenchloride; n-butyllithium; boron trifluoride diethyl etherate; water; boron tribromide; sodium hydride; potassium carbonate; potassium hydroxide;
tetrakis(triphenylphosphine) palladium(0);
In
tetrahydrofuran; 1,4-dioxane; methanol; hexanes; dichloromethane; tert-butyl methyl ether; carbon dioxide; water; N,N-dimethyl-formamide; mineral oil;