three-component synthesis of 3-(2-(phenylamino)thiazol-4-yl)-2H-chromen-2-ones starting from ethyl-4-chloroacetoacetate by treating it with equimolar amounts of various phenylthioureas independently reaction with Salicylaldehyde. Use of biosynthetically prepared l-proline as an efficient catalyst and naturally extracted renewable poly(ethylene) glycol-600(PEG-600) as an effective green reaction media are