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Synthesis of Boc-protected Dendron 4. Reagents, conditions: (a) Boc-Orn(Boc)-OH, DCC/HOSu, THF, 72 h., r.t., yield 90.8%; (b) HCl/EtOAc, 4 h, r.t., yield 98.2%; (c) Boc-Orn(Boc)-OH, DCC/HOSu, THF, 72 h, r.t., yield: 94.1%; (d) 1 M NaOH, 6 h, r.t., yield 89.4%. Note: DCC—N,N′-Dicyclohexylcarbodiimide; HOSu—N-Hydroxysuccinimide.
