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Updated: Jan 23, 2026

Construction of Cyclic Cell-Penetrating Peptides for Enhanced Penetration of Biological Barriers
Published on: September 19, 2022
Synthesis of endolides A and B: naturally occurring N-methylated cyclic tetrapeptides
Emma K Davison1,2, Alan J Cameron1,2,3, Paul W R Harris1,2,3
1School of Chemical Sciences , University of Auckland , 23 Symonds St. , Auckland , 1010 , New Zealand .
Abstract:
Endolides A and B are naturally occurring, N-methylated, cyclic tetrapeptides possessing an unusual 3-(3-furyl)alanine amino acid and outstanding biological profiles. 1-Propanephosphonic anhydride (T3P) was used to mediate a solution-phase cyclisation reaction of the linear tetrapeptides, thus achieving the first syntheses of both endolides A and B. The stereoselectivity of the tetrapeptide cyclisation reactions was found to be reagent-controlled, and was independent of the C-terminal configuration of the linear peptide starting materials.
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