Sulfuric acid-modified polyethylene glycol 6000(PEG-OSO_3H) was applied as an efficient and recyclable catalyst for the synthesis ofβ-amino carbonyl compounds via the Mannich reaction between aldehydes,aromatic ketones and aromatic amines at room temperature using PEG400-H_2O(1:1) as environment-friendly solvents.The reactions were completed in short times and mild reaction conditions with good to excellent yields.
