1: 1-methyl-1H-pyrazole With n-butyllithium in tetrahydrofuran T=0 - 20°C; 2: 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane in tetrahydrofuran T=-78°C;

1: 1-methyl-1H-pyrazole With n-butyllithium in tetrahydrofuran; hexanes T=-78 - 20°C; 1 h; 2: tri-isopropoxy-borane in tetrahydrofuran; hexanes 1 h; 3: With hydrogenchloride; water in tetrahydrofuran; hexanes

4 A molecular sieve in tetrahydrofuran T=20°C; 2 h;

caesium carbonate in acetonitrile T=20°C; 70 h;