A Facile One-Pot Synthesis of Some New Spiro-thiazolidin-4-ones and Benzimidazoles of Biological Interest

Abstract

In a one-pot procedure, aromatic amines 1a–c , 9-fluorenone ( 2 ) and 2-mercaptoacetic acid (3) were converted into fluorenespiro-thiazolidinone derivatives 4a–c , which undergo condensation, oxidation and thiation to afford 6a–i , 7a–c , and 4-thioxo 8a–c , respectively. A new fluorenespiro-thiazolo-benzimidazole 10 was also obtained in one step via cyclocondensation of 1,2-phenylenediamine, 9-fluorenone and 2-mercaptoacetic acid. The obtained products seem to be interesting from the biological point of view.

Keywords:

• 2-Mercaptoacetic acid
• 9-fluorenone
• fluorenespiro[9.2′]-thiazolo[3′,4′-a]benzimidazole
• fluorenespiro[9.2′]-3′-aryl-thiazolidin-4-one derivatives