R. Sola et al., FMOC-BASED SOLID-PHASE PEPTIDE-SYNTHESIS USING DPR(PHOC) LINKER - SYNTHESIS OF A C-TERMINAL PROLINE PEPTIDE, Tetrahedron letters, 37(51), 1996, pp. 9195-9198
Cyclic acylurea readily formed from Dpr(Phoc) linker was shown to prov
ide linkage that is fully compatible with standard Fmoc-based solid-ph
ase peptide synthesis protocols. The utility of this linkage was check
ed during Tyr-Asp-Pro-Ala-(Pro)(6)-OH synthesis which is very prone to
diketopiperazine formation at the dipeptide stage. This side-reaction
was avoided by maintaining the Dpr(Phoc) linker until the tripeptide
stage, while piperidine had to be temporary replaced with morpholine a
s reagent for Fmoc group removal. Copyright (C) 1996 Published by Else
vier Science Ltd