A Facile N‑Mercaptoethoxyglycinamide (MEGA) Linker Approach to Peptide Thioesterification and Cyclization
The C-terminal electrophilic activation of peptides by α-thioesterification requires strongly acidic conditions or complex chemical manipulations, which ultimately limit functional group compatibility and broad utility. Herein, we report a readily accessible N-mercaptoethoxyglycinamide (MEGA) soli...
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Published in | Journal of the American Chemical Society Vol. 139; no. 11; pp. 3946 - 3949 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
American Chemical Society
22.03.2017
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Online Access | Get full text |
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Summary: | The C-terminal electrophilic activation of peptides by α-thioesterification requires strongly acidic conditions or complex chemical manipulations, which ultimately limit functional group compatibility and broad utility. Herein, we report a readily accessible N-mercaptoethoxyglycinamide (MEGA) solid-phase linker for the facile synthesis of latent peptide α-thioesters. Incubating peptide-MEGA sequences with 2-mercaptoethanesulfonic acid at mildly acidic pH yielded α-thioesters that were directly used in NCL without purification. The MEGA linker yielded robust access to thioesters ranging in length from 4 to 35 amino acids, and greatly simplified the synthesis of cyclic peptides. Finally, the high utility of MEGA was demonstrated by the one-pot synthesis of a functional analog of the Sunflower Trypsin Inhibitor 1. |
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ISSN: | 0002-7863 1520-5126 |
DOI: | 10.1021/jacs.6b13271 |