Structure Based, Solid-Phase Synthesis Approach to the Development of Novel Selective Estrogen Receptor Modulatory Steroids

摘要

The overall objective of this project was the development of new chemotherapeutic agents for the treatment of hormone-responsive breast cancer. The specific aims included: (1) the preparation of polymer-bound steroidal starting materials; (2) elaboration via acylation/amidation reactions; (3) biological evaluation of the new compounds; and (4) identification of leads for subsequent optimization. We prepared the polymer-bound estradiol derivatives and prepared several preliminary series of derivatives. We compared the solid-phase and solution-phase methods and concluded that at this time solution-phase chemistry was more reliable and subsequent chemistry used this approach. Several series of 17-a-(substituted aryl)vinyl estradiols were evaluated for ER-hormone binding domain affinity and in vivo efficacy. Most compounds retained significant ER affinity (5-160% of estradiol) and all compounds so far were agonists. Evaluation using molecular modeling and molecular dynamics indicated that the arylvinyl substituents were interacting in the key helix-12 region. In summary, synthetic approaches to potent ER-ligands have been developed and the evaluation results indicated that further derivatives may lead to desired objectives. Follow on studies are now in progress.