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ABSTRACT
A two-steps synthesis of thiazolidin-4-ones, from α-tetralone 6 or thiochroman-4-one 7, catalyzed by acids is described. The reactions of α-tetralone 6 or thiochroman-4-one 7, with substituted thiosemicarbazides, under AcOH or heteropolyacid (HPAs) catalysis afford thiosemicarbazones 8 and 9 in excellent yields. Condensations of the previous compounds 8 and 9 with α-bromoester, under sulfuric acid or heteropolyacid catalysis, yield the corresponding thiazolidin-4-ones 10 and 11.