1.1: hydrogen bromide / water / 10 h / 100 °C / Reflux 1.2: 25 - 35 °C 2.1: potassium hydroxide / tetrahydrofuran / 0.17 h 2.2: 6 h / 10 - 35 °C / Inert atmosphere View Scheme

1: With water; hydrogen bromide T=100°C; 10 h; Sealed tube; 2: With potassium carbonate in water

1: sec.-butyllithium; S-(-)-[1-(3-methoxyphenyl)ethyl]-N,N-dimethylamine T=-50°C; 4 h; 2: chloro-diphenylphosphine T=-50 - 20°C; Further stages. Title compound not separated from byproducts.;