1: 4-bromo-1,3-dimethyl-1H-pyrazole With tert.-butyl lithium in diethyl ether T=-78°C; 0.583333 h; Inert atmosphere; 2: 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane in diethyl ether T=-78 - 25°C; 0.75 h; Inert atmosphere;

n-butyllithium in tetrahydrofuran T=-78 - 20°C; 1.08333 h;

potassium carbonate in acetonitrile T=20°C;