The synthesis of substituted oxopiperazines, which may act as conforma
tionally constrained peptide mimics, is reported. The synthesis is bas
ed on the cyclization of sulfonamide dipeptides with dibromoethane as
the 1, 2-dielectrophile. Alternatively, these mimetics were prepared v
ia a Mitsunobu reaction. (C) 1998 Elsevier Science Ltd. All rights res
erved.