Synthesis of some new thiazole derivatives of pharmaceutical interest

Condensation of 1,3-thiazolidinone derivatives 1a-c with different aromatic aldehydes and/or aryldiazonium chlorides gave the corresponding arylidenes 2-10 and arylazo-1,3-thiazolidinones 12-20. Bromination of 12 resulted in the formation of dibromo derivative 21. Treatment of 1a-c with HCHO-piperidine gave the Mannich adduct 24. Compound 1a was hydroxymethylated, oxidized and formylated to yield the products 25-28. The structures of the new products were confirmed by spectral and analytical methods.