N-bromosuccinmide in N,N-dimethyl-formamide T=0°C;

1: 94 percent / KOH; TBAB / dimethylsulfoxide / 100 °C 2: 96 percent / N-bromosuccinimide / dimethylformamide / 0 °C View Scheme

1: 94 percent / KOH; TBAB / dimethylsulfoxide / 100 °C 2: 96 percent / N-bromosuccinimide / dimethylformamide / 0 °C View Scheme

Multistep reaction. Title compound not separated from byproducts;

1: With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 2: With tri-isopropoxy-borane in tetrahydrofuran; hexane T=-78 - 20°C; 3: With hydrogenchloride in tetrahydrofuran; hexane Further stages.;