Design and synthesis of Fmoc-Thr[PO(OH)(OPOM)] for the preparation of peptide prodrugs containing phosphothreonine in fully protected form.
2014
The design and efficient synthesis of N-Fmoc-phosphothreonine protected by a mono-(pivaloyloxy)methyl (POM) moiety at its phosphoryl group (Fmoc-Thr[PO(OH)(OPOM)]-OH, 1, is reported. This reagent is suitable for solid-phase syntheses employing acid-labile resins and Fmoc-based protocols. It allows the preparation of phosphothreonine (pThr)-containing peptides bearing bis-POM-phosphoryl protection. The methodology allows the first reported synthesis of pThr-containing polypeptides having bioreversible prodrug protection, and as such it should be useful in a variety of biological applications.
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