Abstract
We describe herein a new method for cleaving from resin and removing acid-labile protecting groups in solid-phase peptide synthesis in the presence of a polyfluorinated alcohol (either trifluoroethanol, TFE, or hexafluoroisopropanol, HFIP). It was shown that 0.1 M HCl in hexafluoroisopropanol or trifluoroethanol removes the acid-labile protecting groups commonly used in Fmoc SPPS for the protection of amino acid side-chains, such as t-butyl ester and ether, Boc, trityl, and Pbf groups including the most acid-resistant p-hydroxymethylphenoxyacetyl group (HMPA), p-benzyloxy benzyl ester (Wang resin), Rink amide, and peptide amide linker (PAL). The addition of 5–10% of a hydrogen-bonding solvent was shown to considerably retard or even fully inhibit the reaction. However, nonhydrogen-bonding solvents, such as dichloromethane, do not slow down the reaction.
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Abbreviations
- Boc:
-
tert-butyloxycarbonyl
- Bpoc:
-
p-biphenylisopropyloxycarbonyl
- DMS:
-
dimethylsulfide
- ESI HRMS:
-
electrospray ionization high resolution mass spectrometry
- Fmoc:
-
9-fluorenylmethoxycarbonyl
- HATU:
-
hexafluorophosphate 1-[bis(dimethylamino)methylene]-1H-1,2,3-triazolo[4,5-b]pyridinium-3-oxide
- HFIP:
-
1,1,1,3,3,3-hexafluoroisopropanol
- HMPA:
-
p-hydroxymethylphenoxy acetyl
- MALDI-TOF:
-
Matrix Assisted Laser Desorption/Ionization time-of-flight
- MBHA:
-
p-methylbenzhydrylaminopolystyrene
- MSA:
-
methanesulfonic acid
- NMP:
-
N-methyl-2-pyrrolidone
- RP-HPLC:
-
reverse-phase high performance liquid chromatography
- PAL:
-
peptide amide linker
- Pam:
-
phenylacetamide linker
- Pbf:
-
2,2,4,6,7-pentamethyldihydrobenzofuran-5-sulfonyl
- PEG:
-
polyethylene glycol
- Pmc:
-
2,2,5,7,8-pentamethylchroman-6-sulfonyl
- PS:
-
polystyrene
- TA:
-
thioanisole
- TFE:
-
2,2,2-trifluoroethanol
- TFMSA:
-
trifluoromethanesulfonic acid
- TMSOTf:
-
trimethylsilyltriflate
- TFA:
-
trifluoroacetic acid
- TIS:
-
triisopropylsilane
- Trt:
-
triphenylmethyl (trityl)
- TSA:
-
p-toluenesulfonic acid
- Z:
-
benzyloxycarbonyl
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Results were presented at the VII Russian All-Russian Symposium “Proteins and Peptides;” July 12–17, 2015, Novosibirsk, Russia.
Original Russian Text © D.A. Stetsenko, V.S. Apukhtina, B.P. Chelobanov, P. Palladino, 2016, published in Bioorganicheskaya Khimiya, 2016, Vol. 42, No. 2, pp. 160–170.
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Stetsenko, D.A., Apukhtina, V.S., Chelobanov, B.P. et al. Removal of acid-labile protecting or anchoring groups in the presence of polyfluorinated alcohol: Application to solid-phase peptide synthesis. Russ J Bioorg Chem 42, 143–152 (2016). https://doi.org/10.1134/S106816201602014X
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DOI: https://doi.org/10.1134/S106816201602014X