1: 1,1-dimethylethyl (4-bromo-2-thienyl)carbamate With n-butyllithium in tetrahydrofuran; toluene T=-78°C; 1 h; 2: tri-isopropoxy-borane in tetrahydrofuran; toluene T=-78 - 20°C; 1 h; 3: With hydrogenchloride; water in tetrahydrofuran; ethyl acetate; toluene 0.416667 h;