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Updated: Feb 8, 2026

Constructing Cyclic Peptides Using an On-Tether Sulfonium Center
Published on: September 28, 2022
Application of the DP4 Probability Method to Flexible Cyclic Peptides with Multiple Independent Stereocenters: The
Jason K Cooper1, Kelin Li2, Jeffrey Aubé2
1Joint Center for Artificial Photosynthesis and Chemical Science Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States.
Abstract:
A DP4 protocol has been successfully utilized to establish the true structure of the natural product cyclocinamide A, a flexible cyclic peptide with four isolated stereocenters. Benchmarking the necessary level of theory required to successfully predict the NMR spectra of three previously synthesized isomers of cyclocinamide A led to the prediction of the natural stereochemistry as 4 S, 7 R, 11 R, 14 S, which has been confirmed by total synthesis.
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