Synthesis and Structure Revision of Symplocin A

Area of Science:

• Organic Chemistry
• Synthetic Chemistry
• Peptide Chemistry

Background:

• Symplocin A is a linear peptide containing unusual amino acid residues.
• Previous synthetic routes for complex peptides are often lengthy and inefficient.
• The exact stereochemistry of natural Symplocin A has been a subject of investigation.

Purpose of the Study:

• To achieve the first-time synthesis of Symplocin A.
• To establish and validate a novel 'one-pot intramolecular tandem protocol' for peptide synthesis.
• To unambiguously revise the stereochemistry of natural Symplocin A.

Main Methods:

• Utilized a previously established 'one-pot intramolecular tandem protocol'.
• Employed 1D Nuclear Magnetic Resonance (NMR) spectroscopy.
• Employed 2D Nuclear Magnetic Resonance (2D NMR) spectroscopy.
• Utilized High-Performance Liquid Chromatography (HPLC) for comparison.

Main Results:

• Successfully synthesized Symplocin A for the first time.
• The synthesis employed a highly efficient one-pot intramolecular tandem protocol.
• Stereochemistry of natural Symplocin A was confirmed and revised using NMR and HPLC data.
• The synthesized peptide matched the authentic natural product after stereochemical revision.

Conclusions:

• The 'one-pot intramolecular tandem protocol' is effective for synthesizing complex peptides like Symplocin A.
• The stereochemistry of natural Symplocin A has been unambiguously determined.
• This work provides a reliable synthetic route and corrected structural information for Symplocin A.