B-homoestra-1,3,5(10)-trienes as modulators of tubulin polymerization
申请人:The United States of America as represented by the Department of Health and Human Services
公开号:US06696436B1
公开(公告)日:2004-02-24
The invention provides B-ring expanded estra-1,3,5(10)-triene compounds of general formula (1) which modulate the polymerization of tubulin and/or the depolymerization of microtubules. The compounds have anti-angiogenic and anti-tumor activity. The invention also provides methods of preparing the compounds, and methods of using the compounds for the treatment of cancer or other mammalian diseases characterized by undesirable angiogenesis. The compounds of the invention are also expected to have utility as research tools.
Synthesis of B-Ring Homologated Estradiol Analogues that Modulate Tubulin Polymerization and Microtubule Stability
作者:Zhiqiang Wang、Donglai Yang、Arasambattu K. Mohanakrishnan、Phillip E. Fanwick、Priya Nampoothiri、Ernest Hamel、Mark Cushman
DOI:10.1021/jm0001119
日期:2000.6.1
2-Methoxyestradiol is a cytotoxic human metabolite of estradiol with the ability to bind to the colchicine site of tubulin and inhibit its polymerization, and its 2-ethoxy analogue is even more potent. On the basis of a hypothetical relationship between the structures of colchicine and 2-methoxyestradiol, a B-ring-expanded 2-ethoxyestradiol analogue was synthesized in which the B-ring of the steroid is replaced by the B-ring of colchicine. The synthesis relied on the B-ring expansion of available B-keto estradiol derivatives as opposed to a total synthesis of the homologated steroid framework. The relative configurations of the acetamido substituents in both epimers of the final product were determined by NQESY NMR and confirmed by X-ray crystallography. The epimer having the 6 alpha-acetamido substituent was more active as an inhibitor of tubulin polymerization, and it was also more cytotoxic than the 6 beta-epimer. These results are consistent with the proposed structural resemblance of 2-methoxyestradiol and colchicine. Several of the synthetic intermediates proved to be potent inhibitors of tubulin polymerization. On the other hand, a 3,17 beta-diacetylated, B-ring-expanded analogue of 2-ethoxyestradiol having a ketone at C-6 resembled paclitaxel (Taxol) in its ability to enhance tubulin polymerization and stabilize microtubules. The corresponding 3-acetate and the 17 beta-acetate were both synthesized, and it was determined that the 17 beta-acetate, but not the 3-acetate, conferred on the steroid derivative its paclitaxel-like activity.
A Steroid Derivative with Paclitaxel-Like Effects on Tubulin Polymerization
作者:Pascal Verdier-Pinard、Zhiqiang Wang、Arasambattu K. Mohanakrishnan、Mark Cushman、Ernest Hamel
DOI:10.1124/mol.57.3.568
日期:2000.3.1
work was directed at modifications in the steroid A ring, which is probably analogous to the colchicine tropolonic Cring. One of the most active analogs prepared was 2-ethoxyestradiol (2EE). We report here that different modifications in the steroid B ring of 2EE yield compounds with two apparently distinct modes of action. Simple expansion of the B ring to seven members resulted in a compound comparable