秀丽隐杆线虫对5α-雄甾烷17-one,3β-乙酰氧基和3α-羟基衍生物的微生物转化主要由1β,7-二羟基化或7-单羟基化。3α-乙酰氧基-5α-雄烷-17-主要发生6β,11β-二羟基化。17a- Aza- D -homo-5α-androstan-17-one和3α-乙酰氧基衍生物在6β或7α处主要发生单羟基化反应,而3β-乙酰氧基衍生物虽然进行类似的单羟基化反应却得到良好的收率。 9α-单羟基化产物。
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.
IMMUNOMODULATORY STEROIDS, IN PARTICULAR THE HEMIHYDRATE OF 16.ALPHA.-BROMOEPIANDROSTERONE
申请人:Hollis-Eden Pharmaceuticals
公开号:EP1163256A1
公开(公告)日:2001-12-19
[EN] IMMUNOMODULATORY STEROIDS, IN PARTICULAR THE HEMIHYDRATE OF 16.ALPHA.-BROMOEPIANDROSTERONE<br/>[FR] STEROIDES IMMUNOMODULATEURS, PLUS SPECIFIQUEMENT LE SEMI-HYDRATE DE 16.ALPHA.-BROMOEPIANDROSTERONE
申请人:HOLLIS EDEN PHARMACEUTICALS
公开号:WO2000056757A1
公开(公告)日:2000-09-28
The invention provides compositions comprising formula 1 steroids, e.g., 16alpha-bromo-3beta-hydroxy-5alpha-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 16alpha-bromo-3beta-hydroxy-5alpha-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.
Bell,A.M. et al., Journal of the Chemical Society. Perkin transactions I, 1973, p. 2131 - 2136
作者:Bell,A.M. et al.
DOI:——
日期:——
Microbiological transformations. Part 4. Microbiological transformations of 5α-androstan-17-ones and of 17a-aza-<scp>D</scp>-homo-5α-androstan-17-ones with the fungus Cunninghamella elegans
作者:Trevor A. Crabb、John A. Saul、Roger O. Williams
DOI:10.1039/p19810001041
日期:——
The microbiologicaltransformation of 5α-androstan-17-one, and the 3β-acetoxy- and 3α-hydroxy-derivatives, by Cunninghamellaelegans is dominated by 1β,7-dihydroxylation or 7-monohydroxylation. 3α-Acetoxy-5α-androstan-17-one undergoes predominant 6β,11β-dihydroxylation. 17a-Aza-D-homo-5α-androstan-17-one and the 3α-acetoxy-derivative undergo predominant monohydroxylation at 6β or 7α, in contrast to
秀丽隐杆线虫对5α-雄甾烷17-one,3β-乙酰氧基和3α-羟基衍生物的微生物转化主要由1β,7-二羟基化或7-单羟基化。3α-乙酰氧基-5α-雄烷-17-主要发生6β,11β-二羟基化。17a- Aza- D -homo-5α-androstan-17-one和3α-乙酰氧基衍生物在6β或7α处主要发生单羟基化反应,而3β-乙酰氧基衍生物虽然进行类似的单羟基化反应却得到良好的收率。 9α-单羟基化产物。