The present invention provides N-aryloxypropanolyl-N'-phenethyl-urea derivatives of formula 3, method for their preparation and use thereof as potent appetite suppressants for treatment of obesity 1 wherein R is selected from the group consisting of H, 2, 3 or 4-trifluoromethyl, 2, 3, or 4-chloro, 2, 3, or 4-bromo, 4-acetyl, 4-propionyl, 4-acetamido, 2, 3 or 4 methoxy, 4 nitrile, 2, 3 or 4-methyl, and 4 formyl and X is S or O.