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Starting from (S)-aspartic acid, a versatile approach to (S)-1-benzyl-3-p-toluenesulfonylamino-2, 5 -pyrrolidinedione, (S)-1-benzyl-4-p-toluenesulfonylamino-2-pyrrolidinone and (S)-1-benzyl-3-p-toluenesulfonylaminopyrrolidine is described.