1: pyridin-2-ylacetylene With n-butyllithium in tetrahydrofuran; hexane T=0°C; 0.25 h; 2: N,O-dimethylacetohydroxamic acid in tetrahydrofuran; hexane T=-78 - 20°C; 2.5 h; Further stages.;

sodium tetrahydroborate in ethanol T=0°C; 1 h;