Zobrazeno 1 - 10 of 78 pro vyhledávání: '"Sigfrid Schwarz"'
3
The remarkable influence of steroid A/B-ring junction on the Wittig olefination reaction of the 11-oxo group: Towards the synthesis of 5α- and 5β-oriented Δ3-isomers of desogestrel
Autor: Sigfrid Schwarz, Gisela Weber, Alexander Hillisch, Sven Ring
Publikováno v: Steroids. 63:21-27
The 5 alpha- and 5 beta-oriented delta 3-double bond isomers 8, 9 of the widely used progestin desogestrel (7) were synthesized. Wittig olefination reaction of the 5 alpha-intermediate 12 showed a dramatically reduced reaction rate compared with the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cdefb629cc856f92c68a3adc54d99e61
https://doi.org/10.1016/s0039-128x(97)00105-0
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4
Novel estrogens and their radical scavenging effects, iron-chelating, and total antioxidative activities: 17α-substituted analogs of Δ9(11)-dehydro-17β-estradiol
Autor: Sigfrid Schwarz, Peter Droescher, Michael Oettel, Bernd Menzenbach, Wolfgang Römer
Publikováno v: Steroids. 62:688-694
Antioxidant effects of N,N-dimethyl-p-toluidine, p-cresol, and p-(hydroxy)thioanisol 17 alpha-substituted analogs of 17 beta-estradiol and their delta 9(11)-dehydro homologs were investigated using four different in vitro models: rat synaptosomal lip
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c3e5914ef40126d06243ec9f0bd052c3
https://doi.org/10.1016/s0039-128x(97)00068-8
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5
Influence of subchronic administration of oestradiol, ethinyloestradiol and oestradiol sulphamate on bile flow, bile acid excretion, and liver and biliary glutathione status in rats
Autor: Sigfrid Schwarz, A. Barth, Walter Elger, Birgitt Schneider
Publikováno v: Archives of Toxicology. 71:443-449
The cholestatic effect of the newly developed oestradiol sulphamate (J995) was compared with that of the natural oestrogen oestradiol (E) and of the cholestatic standard oestrogen ethinyloestradiol (EE). Female ovariectomized rats were orally treated
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3516e8f4a0d6d2d9c12b3877143807bf
https://doi.org/10.1007/s002040050409
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10
Syntheses and Reactions of 2,2-Disubstituted Cyclopentane-1,3-diones, 6. Conversion of 2-Methylcyclopentane-1,3-dione into 5-Methylcycloheptane-1,4-dione via 3-(1-Methyl-2,5-dioxocyclopentyl)propanal
Autor: Andre Hauser, Birgit Roatsch, Sigfrid Schwarz, Hartmut Schwarz, Hans Schick
Publikováno v: Liebigs Annalen der Chemie. 1992:419-422
In contrast to earlier reported unsuccessful experiments the Michael addition of prop-2-enal to 2-methylcyclopentane-1,3-dione (1) affords 3-(1-methyl-2,5-dioxocyclopentyl)propanal (3) in 90% yield, if the reaction is carried out in water without a b
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fe2ea36229e5d9afb584822a77b8aa36
https://doi.org/10.1002/jlac.199219920176
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