An easy stereoselective synthesis of 5(10)-estrene-3β,17α-diol, a biological marker of pregnancy in the mare
摘要:
5(10)-Estrene-3 beta,17 alpha-diol is an essential reference material for doping analysis in horse-racing laboratories. It is used to detect misuse, for doping purpose, of the pregnancy status in the mare. Its stereoselective synthesis from 17 beta-estradiol-3-methyl ether (prepared from estrone or 17 beta-estradiol) was performed in four steps: (1) Mitsunobu inversion of the 17 beta-alcohol; (2) Birch reduction of the aromatic ring; (3) stereoselective reduction of the 3-ketone via Noyori asymmetric transfer hydrogenation; (4) chemoenzymatic purification. (C) 2014 Elsevier Inc. All rights reserved.
These metabolites have not been studied in depth for steroids and could be interesting markers for doping control. The aim of the present work was to study the ionization and collision-induced dissociation of steroid bisglucuronides to be able to develop mass spectrometric analytical strategies for their detection in urine samples after AAS administration. Because steroid bisglucuronides are not commercially
Regioselectivity in the Hydroboration of Steroidal Δ3-Allylic Alcohols†
作者:Muzaffar Alam、James R. Hanson、Mansur Liman、Sivajini Nagaratnam
DOI:10.1039/a605946e
日期:——
The presence of an allylic 5α-hydroxy group in an androst-3-ene increases the proportion of addition of a borane to the adjacent C-4 compared to the unsubstituted steroid and directs the addition to the face of the alkene anti to the hydroxy group with stereochemical effects that may oppose those of the C-10β-methyl group.
Pharmaceutical compositions and treatment methods-7
申请人:Ahlem Nathaniel Clarence
公开号:US20050282732A1
公开(公告)日:2005-12-22
The invention provides compositions comprising formula 1 steroids, e.g., 16α-bromo-3β-hydroxy-5α-androstan-17-one hemihydrate and one or more excipients, typically wherein the composition comprises less than about 3% water. The compositions are useful to make improved pharmaceutical formulations. The invention also provides methods of intermittent dosing of steroid compounds such as analogs of 16α-bromo-3β-hydroxy-5α-androstan-17-one and compositions useful in such dosing regimens. The invention further provides compositions and methods to inhibit pathogen (viral) replication, ameliorate symptoms associated with immune dysregulation and to modulate immune responses in a subject using certain steroids and steroid analogs. The invention also provides methods to make and use these immunomodulatory compositions and formulations.
Dmochowska-Gladysz, Jadwiga; Tlomak, Elzbieta; Siewinski, Antoni, Bulletin de l'Academie Polonaise des Sciences, Serie des Sciences Chimiques, 1980, vol. 28, # 1, p. 1 - 8
作者:Dmochowska-Gladysz, Jadwiga、Tlomak, Elzbieta、Siewinski, Antoni