Synthesis of Cytotoxic 6E-Hydroximino-4-ene Steroids: Structure/Activity Studies
摘要:
In an effort to determine the pharmaceutical utility and the structural requirements for activity against various tumor cell lines, several 6E-hydroximino-4-ene steroids with different side chains and degrees of unsaturation on ring A were synthesized in our laboratory. Evaluation of the synthesized compounds for cytotoxicity against P-388, A-549, HT-29, and MEL-28 tumor cells revealed that some important structural features are required for activity. The presence of a cholesterol-type side chain, which appears to play a major role in determining the biological activity, the existence of a ketone functionality at C-3, and an elevated degree of oxidation on ring A all result in higher bioactivity than other structural motifs.
One-pot, high yield synthesis of α-ketols from Δ5-steroids
作者:Jorge A.R. Salvador、Vânia M. Moreira、James R. Hanson、Rui A. Carvalho
DOI:10.1016/j.steroids.2005.11.002
日期:2006.3
a-Hydroxy ketones (alpha-ketols) are present in many compounds with biological activity. Several methods are available for the preparation of alpha-ketols but only a few of them describe the synthesis of steroid alpha-ketols from olefins. In this work, a new system consisting of KMnO4/Fe(ClO4)(3)center dot nH(2)O was used in order to achieve the direct conversion of Delta(5)-steroids to their corresponding alpha-ketols, in high yields. Consideration of the probable reaction mechanism is provided. 2D homo- and heteronuclear correlation NMR spectroscopic techniques were used to assign H-1 and C-13 resonances of some synthesized compounds. This method has potential for the preparation of alpha-hydroxy ketones of biological interest. (c) 2005 Elsevier Inc. All rights reserved.
Synthesis of Cytotoxic 6<i>E</i>-Hydroximino-4-ene Steroids: Structure/Activity Studies
作者:Noé Deive、Jaime Rodríguez、Carlos Jiménez
DOI:10.1021/jm010867n
日期:2001.8.1
In an effort to determine the pharmaceutical utility and the structural requirements for activity against various tumor cell lines, several 6E-hydroximino-4-ene steroids with different side chains and degrees of unsaturation on ring A were synthesized in our laboratory. Evaluation of the synthesized compounds for cytotoxicity against P-388, A-549, HT-29, and MEL-28 tumor cells revealed that some important structural features are required for activity. The presence of a cholesterol-type side chain, which appears to play a major role in determining the biological activity, the existence of a ketone functionality at C-3, and an elevated degree of oxidation on ring A all result in higher bioactivity than other structural motifs.
Sulfuric acid hydrolysis of 3β-hydroxy-5α, 6α-epoxyandrostane