Polymer-bound TBTU as a new solid-supported reagent for peptide synthesis

A new polymer-supported TBTU (P-TBTU) has been prepared from polystyrene-bound 1-hydroxybenzotriazole (P-HOBT) and used efficiently as a solid-supported reagent for peptide-coupling reactions, and is even effective with wet solvents. The P-HOBT can be recovered by simple filtration and reused for the preparation of new P-TBTU.