1: 1-(4'-bromophenyl)-1H-pyrazole With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 1 h; 2: boric acid trimethyl ester in tetrahydrofuran; hexane T=-78°C; 3: With water; ammonium chloride in tetrahydrofuran; hexane

1: With n-butyllithium in tetrahydrofuran T=-78 - 20°C; 18 h; 2: With hydrogenchloride; water in tetrahydrofuran 1 h;