Water Soluble Steroids with Catalytic Substituents II. Synthesis of 3β-(4(5)-Imidazolyl)-5α-androstane-11β, 17β,-diamine and Comparison of its Catalytic Properties with Those of 17β-(4(5)-Imidazolyl)-5α-androstane-3β, 11β-diamine
Microbial hydroxylation of epiandrosterone by <i>Aspergillus candidus</i>
作者:Kudret Yildirim、Ali Kuru
DOI:10.1080/10242422.2017.1289184
日期:2017.3.4
work, Aspergillus candidus MRC 22634 converted epiandosterone 1 into 10 hydroxylated metabolites. A. candidus has been shown to hydroxylate 1 predominantly at C-11α, C-1α, and C-15β with minor hydroxylations occurring at C-14α and C-7α. Oxidation at C-3, reduction at C-17, and C-3 epimerization of some of the remaining substrate have also been shown. 15β-Hydroxylation and C-3 epimerization of 1 by
Steroids and related products. LII.11-Aza steroids. Part IV. The synthesis of 11-aza 9α-steroids. II. The synthesis of 11-aza-4,5α-dihydrotestosterone
作者:Maria Gumulka、Ibrahim Halim Ibrahim、Zbigniew Bończa-Tomaszewski、Ch. R. Engel
DOI:10.1139/v85-126
日期:1985.3.1
An efficient synthesis from adrenosterone or 11α-hydroxytestosterone of 17β-hydroxy-11-aza-5α-androstan-3-one, the 11-aza analogue of dihydrotestosterone, is described. For the elaboration of the 1...
Microbial Baeyer–Villiger oxidation of 5α-steroids using Beauveria bassiana. A stereochemical requirement for the 11α-hydroxylation and the lactonization pathway
Beauveria bassiana KCH 1065, as was recently demonstrated, is unusual amongst fungal biocatalysts in that it converts C-19 3-oxo-4-ene and 3 beta-hydroxy-5-ene as well as 3 beta-hydroxy-5 alpha-saturated steroids to 11 alpha-hydroxy ring-D lactones. The Baeyer-Villiger monooxygenase (BVMO) of this strain is distinguished from other enzymes catalyzing BVO of steroidal ketones by the fact that it oxidizes solely substrates with 11 alpha-hydroxyl group. The current study using a series of 5 alpha-saturated steroids (androsterone, 3 alpha-androstanediol and androstanedione) has highlighted that a small change of the steroid structure can result in significant differences of the metabolic fate. It was found that the 3 alpha-stereochemistry of hydroxyl group restricted "normal" binding orientation of the substrate within 11 alpha-hydroxylase and, as a result, androsterone and 3 alpha-androstanediol were converted into a mixture of 7 beta-, 11 alpha- and 7 alpha-hydroxy derivatives. Hydroxylation of androstanedione occurred only at the 11 alpha-position, indicating that the 3-oxo group limits the alternative binding orientation of the substrate within the hydroxylase. Only androstanedione and 3 alpha-androstanediol were metabolized to hydroxylactones. The study uniquely demonstrated preference for oxidation of equatorial (11 alpha-, 7 beta-) hydroxyketones by BVMO from B. bassiana. The time course experiments suggested that the activity of 17 beta-HSD is a factor determining the amount of produced ring-D lactones. The obtained 11 alpha-hydroxylactones underwent further transformations (oxy-red reactions) at C-3. During conversion of androstanedione, a minor dehydrogenation pathway was observed with generation of 11 alpha,17 beta-dihydroxy-5 alpha-androst-1-en-3-one. The introduction of C1-C2 double bond has been recorded in B. bassiana for the first time. (C) 2014 Elsevier Inc. All rights reserved.
Crabb, Trevor A.; Ratcliffe, Norman M., Journal of Chemical Research, Miniprint, 1989, # 9, p. 2162 - 2174