1: 4-methoxy-2,3,5-trimethylpyridine With n-butyllithium in tetrahydrofuran T=-90 - -80°C; 0.5 h; 2: (-)-menthyl 5-methoxy-2-benzimidazolylsulphinate in tetrahydrofuran T=-80 - -20°C; 3: With water in tetrahydrofuran T=-20°C;