Premium
C6–C8 Bridged Epothilones: Consequences of Installing a Conformational Lock at the Edge of the Macrocycle
Author(s) -
Zhan Weiqiang,
Jiang Yi,
Sharma Shubhada,
Brodie Peggy J.,
Bane Susan,
Kingston David G. I.,
Liotta Dennis C.,
Snyder James P.
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201102630
Subject(s) - epothilones , epothilone , microtubule , chemistry , tubulin , stereochemistry , biophysics , biology , microbiology and biotechnology
A series of conformationally restrained epothilone analogues with a short bridge between the methyl groups at C6 and C8 was designed to mimic the binding pose assigned to our recently reported EpoA–microtubule binding model. A versatile synthetic route to these bridged epothilone analogues has been successfully devised and implemented. Biological evaluation of the compounds against A2780 human ovarian cancer and PC3 prostate cancer cell lines suggested that the introduction of a bridge between C6–C8 reduced potency by 25–1000 fold in comparison with natural epothilone D. Tubulin assembly measurements indicate these bridged epothilone analogues to be mildly active, but without significant microtubule stabilization capacity. Molecular mechanics and DFT energy evaluations suggest the mild activity of the bridged epo‐analogues may be due to internal conformational strain.