Scheme 1.
Synthesis of cyclo (d-Pro-l-Br-Tyr) (6) and cyclo (l-Pro-l-Br-Tyr) (7). TBTU: (O-(1H-Benzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium tetrafluoroborate), DIPEA: (N,N-Diisopropyléthylamine).
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