Abstract
The diversity of cyclic peptides was expanded by elaborating Mitsunobu macrocyclization, tethering various hydroxy acid building blocks with different Nε-amine substituents. This new strategy was then applied in synthesizing peptidomimetic estrogen receptor modulator (PERM) analogs on the solid support. The PERM analogs exhibited increased serum peptidase stability, cell penetration, and estrogen receptor α binding affinity. Studying diversity-oriented methods for preparing azacyclopeptides provides a new tool for macrocycle construction and further structural information for optimizing ERα modulators for ER positive breast cancers.
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