1: 2,3-dichloro-5-(5-ethyl-1,3-oxazol-2-yl)pyridine With n-butyllithium; diisopropylamine in tetrahydrofuran T=-78 - 0°C; 1.5 h; 2: methanethiosulfonic acid S-methyl ester in tetrahydrofuran T=-78 - 20°C; 16 h;