1: 4-bromo-1-iodobenzene With 2,2,6,6-tetramethylpiperidinyl-lithium in tetrahydrofuran T=-80°C; Inert atmosphere; 2: N,N-dimethyl-formamide in tetrahydrofuran T=-75 - -20°C;

methanol; sodium tetrahydroborate T=0 - 20°C; 0.5 h;