AI Article Synopsis
- Low yields and significant epimerization in peptide-α-thioesters hinder the effectiveness of native chemical ligation (NCL), while more reactive peptide arylthioesters are difficult to manage due to hydrolysis.
- A new photochemical method using 7-nitroindoline is introduced, enabling high yield generation of protected peptide phenylthioesters from photoreactive precursors under neutral conditions and with minimal epimerization.
- This approach is compatible with Fmoc-strategy solid-phase synthesis and allows for global deprotection to obtain peptide phenylthioesters, and can also convert peptide precursors into hydrazides.
Article Abstract
Low yields and substantial epimerization of peptide-α-thioesters often compromise the overall efficiency of native chemical ligation (NCL). Peptide arylthioesters are more reactive than peptide alkylthioesters in NCL, but are also more difficult to handle due to their propensity to hydrolyze, and are therefore often generated in situ. However, pre-prepared peptide arylthioesters are required for some NCL applications. Here we present a 7-nitroindoline-based photochemical method that generates protected peptide phenylthioesters under neutral reaction conditions via their activated esters from photoreactive peptide precursors in high isolated yields, and with low levels of epimerization. This method is fully compatible with Fmoc-strategy solid-phase peptide synthesis. Global deprotection with trifluoroacetic acid furnishes peptide phenylthioesters for NCL. Photoreactive peptide precursors can also be converted into their hydrazides in two steps by this method.
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| http://dx.doi.org/10.1002/cbic.201500266 | DOI Listing |
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