1: 4,5-dibromo-2-methyl-1,2,3-triazole; 1-methyl-4,5-dibromo-1H-1,2,3-triazole With n-butyllithium in tetrahydrofuran T=-80°C; 0.333333 h; 2: methyl iodide in tetrahydrofuran T=-80°C; 2 h;