Preparation of polymer-bound trityl-hydrazines and their application in the solid phase synthesis of partially protected peptide hydrazides

Polymer-bound N-tritylhydrazines 4 were easily prepared by reacting polymeric tritylchlorides 3 with hydrazine. Subsequently, compounds 4 have been successfully applied to the solid phase synthesis of partially protected peptide hydrazides using 1-hydroxybenzotriazolyl esters of Fmoc- or Trt-amino acids. The synthesized peptide hydrazides can be quantitatively split off from the resins by mild acidic treatment, while the benzyl- and tert-butyl protecting groups remain unaffected.