Abstract 3-Acetyl-4-hydroxy-chromen-2-one (1) was brominated with phenyltrimethylammonium tribromide to afford 3-(2-bromoacetyl)-4-hydroxy-chromen-2-one (2) whose reactions with thiourea, thioacetamide and ammonium dithiocarbamate gave respectively 3-(2-amino-thiazol-4-yl)-4-hydroxy-, 4-hydroxy-3-(2-phenyl-thiazol-4-yl)-and 4- hydroxy-3-(2-mercapto-thiazol-4-yl) chromen-2-one. In a similar manner, com pound 2 ...
