Scheme 5.
Synthesis of peptide dendrons 13 and 14 in solution: (i) HCl/EtOAc, 8 h, r.t.; (ii) Fmoc-Pro-OH, DCC/HOSu, THF, 126 h, r.t.; or Fmoc-His(Boc)-OH, DCC/HOSu, THF, 126 h, r.t.; (j) 20% piperidine/MeOH; (k) HCl/EtOAc, 8 h, r.t.
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