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Retrosynthetic strategy toward new (5Z) 2-amino-5-arylidene-1,3-thiazol-4(5H)-ones 5a–q based on the use of secondary cyclic amines building blocks 4a–h in sulfur/nitrogen displacement reaction and the use of various 2-thioxo-1,3-thiazolidin-4-ones 1a–i as starting platforms in Knoevenagel condensation.
