Production of 16β-(acetoxy)acetoxy derivatives by reaction of 17-keto steroid enol acetates with lead (IV) acetate
作者:M Numazawa
DOI:10.1016/s0039-128x(01)00103-9
日期:2001.10
16beta-acetoxy-17-ketones with the lead reagent did not yield the corresponding (acetoxy)acetates. Reaction of the enolacetate 3 with Pb(OCOCD(3))(4) in CD(3)COOD yielded principally the labeled (acetoxy)acetate 10-d(3), which had a CD(3)COOCH(2)COO moiety at C-16beta. In contrast, when the deuterated enolacetate 3-d(3), which was obtained by treatment of the 17-ketone 14 with (CD(3)CO)(2)O in the presence
Effects of steroid D-ring modification on suicide inactivation and competitive inhibition of aromatase by analogs of androsta-1,4-diene-3,17-dione
作者:Paul F. Sherwin、Patrick C. McMullan、Douglas F. Covey
DOI:10.1021/jm00123a026
日期:1989.3
human placental aromatase. As long as the five-membered ring is intact, modifications of the D ring such as reduction or removal of the carbonyl group or conversion to a gamma-butyrolactone cause a less than 6-fold decrease in affinity for and rate of inactivation of aromatase, compared to 3a. Thus, an oxygen atom at C-17 is not required for binding of these inhibitors to aromatase, suggesting that
Dehydroepiandrosteronesulfatide was prepared in a 68% yield by the reaction of 5-androstene-3 beta-ol-17-one 3 sulfate (silver salt) with dipalmitoyl alpha-iodopropylene glycol. The sulfatide was found to be a more potent inhibitor of human glucose-6-phosphate dehydrogenase than dehydroepiandrosterone. 16 alpha-Halogenated steroids also were prepared by direct halogenation of the steroid or indirect
Synthesis of stable isotope labelled steroid bis(sulfate) conjugates and their behaviour in collision induced dissociation experiments
作者:Christopher C. J. Fitzgerald、Malcolm D. McLeod
DOI:10.1039/d2ob00375a
日期:——
identify and quantify biomarkers of interest and depends in turn on access to steroid reference materials and their stableisotopelabelled (SIL) derivatives. A new [18O] stableisotopelabel for sulfate metabolites is reported, which allows for the selective, late-stage and ‘one-pot’ synthesis of a variety of SIL–steroid conjugates suitable as MS probes and internal standards. The method is applied to more
类固醇二(硫酸盐)代谢物来源于非结合前体的两次硫酸化,代表了类固醇谱中一个重要但未被充分研究的部分。在医学或反兴奋剂科学等领域对这些化合物的研究依赖于质谱 (MS) 作为识别和量化感兴趣的生物标志物的主要工具,并依赖于获得类固醇参考材料及其稳定同位素标记 (SIL ) 衍生物。一个新的 [ 18报道了硫酸盐代谢物的 O] 稳定同位素标记,它允许选择性、后期和“一锅”合成各种适合作为 MS 探针和内标的 SIL-类固醇缀合物。该方法适用于通过碰撞诱导解离 (CID) 实验更全面地研究甾体二(硫酸盐) 化合物的 MS 行为。
Chemistry of difluorocyclopropyl acetates. Application of difluorocarbene chemistry to homologation reactions