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Diffusion-Enhanced Amide Bond Formation on a Solid Support
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DOI：10.1021/acs.oprd.9b00398.png)
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Abstract
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Mixing of polystyrene resins in solid-phase synthesis is performed by shaking or gentle agitation of the reaction vessel to avoid breaking the brittle beads. These mixing strategies result in poor diffusion to and into the beads. Using a large excess of reagents is the common way to compensate for these deficiencies. We use fast overhead stirring for performing coupling reactions on a solid support. We show that fast overhead stirring enhances the efficiency of amide bond formation on the solid support compared to the state-of-the-art mixing method, while preserving the integrity of the beads. We find that fast overhead stirring minimizes the effect of decomposition of the activated species by increasing the diffusion-dependent coupling reaction. This allows decreasing the excess of reagents used for the multistep synthesis of peptides, thus providing a greener and more sustainable alternative for peptide synthesis on solid supports.
Keywords:
peptides
solid-phase synthesis
amide bond formation
sustainable chemistry
diffusion
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