Journal
ORGANIC LETTERS
Volume 8, Issue 5, Pages 919-922Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol053095o
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Despite the plethora of techniques to cyclize small peptides, a synthesis of cyclo-[(L)Pro-(L)Tyr-(L)Pro-(L)Val], a potent tyrosinase inhibitor, remains elusive because of the unfavorable transition state leading to the cyclic product. Herein, we report the successful synthesis of its triazole analogue, cyclo-[(L)PrO-(L)Val-psi(triazole)-(L)PrO-(L)Tyr]. Attempted cyclization via peptide bond formation at room temperature fails to provide the desired product, but Cu-I-catalyzed alkyne-azide coupling at 110 degrees C affords the triazole tetrapeptide in 70% yield, demonstrating the utility of click chemistry.
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