Results 231 to 240 of about 7,631 (266)
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Transformation of androstane derivatives by Spirodela oligorrhiza
Phytochemistry, 1985Abstract Spirodela oligorrhiza (duckweed) is capable of transforming some steroids of the androstane series. Hydrolysis of the acetates of testosterone and of 3β-hydroxyandrost-5-en-17-one by this species yielded the corresponding alcohols.
Elżbieta Tłomak +3 more
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, 1975
The sequence of microbiological reactions involved in the 19-hydroxylation of 5α-androstan-17-one has been established. When a solution of 5α-androstan-17-one in dimethyl sulphoxide is incubated with Calonectria decora, the initial 1β,6α-dihydroxylation ...
V. Chambers +6 more
semanticscholar +1 more source
The sequence of microbiological reactions involved in the 19-hydroxylation of 5α-androstan-17-one has been established. When a solution of 5α-androstan-17-one in dimethyl sulphoxide is incubated with Calonectria decora, the initial 1β,6α-dihydroxylation ...
V. Chambers +6 more
semanticscholar +1 more source
Ab initio calculations on 5α‐androstane
International Journal of Quantum Chemistry, 1992AbstractThe electronic structure of 5α‐androstane, the parent hydrocarbon of the hormonal steroids, has been computed by ab initio SCF methods in an STO‐3G basis. The results are compared with existing MNDO computations and are used to discuss long‐range electronic interactions between distant substituents that might be appended to rings A and D of 5α ...
Leo Klasinc +4 more
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An improved synthesis of 13-epi-androstanes and of 13-epi-oestranes
, 1977Treatment of a 17-hydroxyimino-steroid with refluxing acetic anhydride and pyridine affords an equilibrium mixture of 13-epi-enimide and 13-epi-enamide. A free-radical mechanism is proposed.
R. B. Boar +4 more
semanticscholar +1 more source
Androstane and Withanolides fromPhysalis cinerascens
Planta Medica, 2005Two new withanolides, cinerolide and 24,25-dihydrowithanolide S, together with the new androstane, cinedione, and the known withanolides, visconolide, physalactone, withanolide S and 4beta-hydroxywithanolide E were isolated from the EtOAc extract of leaves, flowers and stems of Physalis cinerascens. The structures of these compounds were established by
Ana L. Pérez-Castorena +4 more
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Biotransformation of 5α-androstane-3,17-dione by microalgal cultures.
Bioorganic & Medicinal Chemistry Letters, 1991Abstract Twenty-four different strains of unicellular algae have been used in the bioconversion of 5α-androstane-3,17-dione. 5 α -androstane-3,17-dione has been bioconverted by twenty-four microalgae The activity of algae seems to be species-specific. Reducted, hydroxylated or more unsaturated steroids have been isolated from the cultures.
FIORENTINO, Antonio +3 more
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The Stereochemistry of the Hydroboration of 2- and 3-Methylene-5α-androstanes
, 1999The exo facial selectivity in the hydroboration of 2-, 3- and 4-methylene-5α-androstanes is rationalized in terms of the easier steric access and a hyperconjugative interaction of the alkene with the adjacent axial C–H bonds enhancing the electron ...
K. Al-Footy, J. Hanson, C. Uyanik
semanticscholar +1 more source
, 1975
Mono- and di-ketones and keto-alcohols derived from 5α-androstane have been incubated with the fungus Daedalea rufescens, a Basidiomycete species not previously reported as a steroid hydroxylator.
A. M. Bell +4 more
semanticscholar +1 more source
Mono- and di-ketones and keto-alcohols derived from 5α-androstane have been incubated with the fungus Daedalea rufescens, a Basidiomycete species not previously reported as a steroid hydroxylator.
A. M. Bell +4 more
semanticscholar +1 more source
Seroflocculants in the Androstane Series
The Journal of Organic Chemistry, 1961Robert T. Blickenstaff +1 more
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