1: 2-mercapto-4,5-dihydro-thiazole With sodium carbonate in ethanol; water T=20°C; 2: 2-bromo-1-(4-chloro-phenyl)-ethanone in ethanol; water T=20°C;

pyridine Ambient temperature;

hydroxylamine hydrochloride; tetrabutylammomium bromide; sodium acetate in 1,4-dioxane; water T=20°C; 72 h;