作者:L. C. R. Andrade、J. A. Paixão、M. J. de Almeida、E. J. Tavares da Silva、M. L. Sá e Melo、A. S. Campos Neves
DOI:10.1107/s0108270199011877
日期:1999.12.15
The asymmetric unit of the title compound, C19H28O3, contains two independent molecules with almost identical geometry. The molecules have a planar 5 alpha configuration as a result of a trans-A/B junction of the rings. The compound crystallizes in a triclinic cell, which is unusual for steroids. The molecules are linked head-to-tail via hydrogen bonds between the ring A hydroxyl group and the ketone group of ring D, forming two independent chains running along the c axis.
Structure−Activity Relationships of New A,D-Ring Modified Steroids as Aromatase Inhibitors: Design, Synthesis, and Biological Activity Evaluation
作者:Margarida M. D. S. Cepa、Elisiário J. Tavares da Silva、Georgina Correia-da-Silva、Fernanda M. F. Roleira、Natércia A. A. Teixeira
DOI:10.1021/jm050129p
日期:2005.10.1
3-deoxy steroidal olefin 3a and its epoxide derivative 4a proved to be strong competitive aromataseinhibitors (K(i) = 50 and 38 nM and IC50 = 225 and 145 nM, respectively). According to our findings, the C-3 carbonyl group is not essential for anti-aromatase activity, but 5alpha-stereochemistry and some planarity in the steroidal framework is required. Furthermore, modification of the steroidal cyclopentanone