1: 2-(4-tolylsulfanyl)-phenyl bromide With n-butyllithium in tetrahydrofuran; n-heptane T=0°C; 0.75 h; Inert atmosphere; 2: N-ethoxycarbonyl-4-piperidone in tetrahydrofuran; n-heptane T=-15 - 20°C; Inert atmosphere; 3: With hydrogenchloride in tetrahydrofuran; n-heptane; water
