hydrogen bromide in acetic acid T=80°C; 6 h;

1: 3-oxo-thiomorpholine With sodium hydride in N,N-dimethyl-formamide T=20°C; 0.25 h; 2: 2-bromo-5-(3-bromopropyl)pyridine in N,N-dimethyl-formamide 3.5 h;