Zobrazeno 1 - 10
of 158
pro vyhledávání: '"Siegfried E. Drewes"'
Autor:
Siegfried E. Drewes
Publikováno v:
South African Journal of Science, Vol 108, Iss 5/6 (2012)
Having spent some 50 years as an organic chemist with an interest in medicinal plant chemistry in South Africa it was relevant now to ask three questions, (1) when were natural products first utilised, (2) who were the people involved, and (3) what i
Externí odkaz:
https://doaj.org/article/3a343fc4c48f47e383168a46f0c3a63f
Publikováno v:
Tetrahedron. 67:8654-8658
The pyranocoumaronochromone lupinalbin H was synthesized in three major steps, which involved preparation of 2′-hydroxygenistein by the Suzuki–Miyaura reaction, followed by oxidative cyclodehydrogenation into lupinalbin A. The final step was the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1ae5ba20ab7871b6a1fcf45a5c8508fc
https://doi.org/10.1016/j.tet.2011.09.042
https://doi.org/10.1016/j.tet.2011.09.042
Publikováno v:
Journal of Natural Products. 73:1680-1685
The first total synthesis of the pyranoisoflavone kraussianone 1 (1) is described. The key steps involved the Suzuki-Miyaura reaction for the construction of the isoflavone core and the regioselective formation of the dimethylpyran scaffolds to the p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5308a401fd9a7987fa6cbe13985fc0d0
https://doi.org/10.1021/np100407n
https://doi.org/10.1021/np100407n
Publikováno v:
Natural Product Research. 24:457-490
This work reviews the four basic structural types of homoisoflavanones. The relationships between the various structures of homoisoflavanones and their plant origins, ethnobotany and biological activities are put into perspective.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::592cee0a881023ca1f4386209ed936fb
https://doi.org/10.1080/14786410903335174
https://doi.org/10.1080/14786410903335174
Publikováno v:
Journal of Ethnopharmacology. 119:593-598
The use of Hypoxis hemerocallidea Fisch. and C.A. Mey. (Hypoxidaceae) extracts for ailments other than benign prostate hyperplasia (BPH) is now a reality. The whole extract, the phytosterols, as well as the major constituents it contains (hypoxoside,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b7a200da20dd4b81f0c3f0475ac59920
https://doi.org/10.1016/j.jep.2008.05.027
https://doi.org/10.1016/j.jep.2008.05.027
Autor:
Dulcie A. Mulholland, J. Van Staden, E.E. Elgorashi, Sarel F. Malan, K. Du Toit, Siegfried E. Drewes
Publikováno v:
South African Journal of Botany. 73(2):236-241
Antibacterial activity, as detected in the bioautographic and microplate assays against Staphylococcus aureus, was shown for thirteen homoisoflavanones isolated from six Hyacinthaceae species. Four of these homoisoflavanones were isolated from Eucomi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bca9046ccc369dfbf64e87dfbc2a83ed
Publikováno v:
Journal of Natural Medicines. 61:244-250
Erectile dysfunction (ED) is a common medical condition in men with cardiovascular disorders such as ischaemic heart disease, hypertension and peripheral vascular diseases. It is also common in men with diabetes mellitus, probably because of the shar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::47ef52f343e2bfbd0a54d84c8e8cb59c
https://doi.org/10.1007/s11418-006-0129-0
https://doi.org/10.1007/s11418-006-0129-0
Autor:
A. Langlois, Dulcie A. Mulholland, Siegfried E. Drewes, K. Du Toit, Chantal Koorbanally, Neil R. Crouch
Publikováno v:
South African Journal of Botany. 72:428-433
Three species of the small but ethnomedicinally important genus Eucomis (Hyacinthaceae) have been investigated phytochemically. These have yielded a range of homoisoflavanones of the 3-benzyl-4-chromanone, benzylidene and scillascillin types as well
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d612dd5bd85f265a413a4345bc3ca9da
https://doi.org/10.1016/j.sajb.2005.12.006
https://doi.org/10.1016/j.sajb.2005.12.006
Publikováno v:
Phytochemistry. 67:716-722
The hexane extract of fresh air-dried leaves of Helichrysum tenax (Asteraceae) afforded ent-beyer-15-en-19-ol (1), its 4-epimer ent-beyer-15-en-18-ol (2), 15beta,16beta-epoxide-ent-beyeran-19-ol (3), as well as (4) consisting of two units of (1) link
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d4f0c2d98326fca85a8ffa0f83d16f44
https://doi.org/10.1016/j.phytochem.2005.12.015
https://doi.org/10.1016/j.phytochem.2005.12.015
Publikováno v:
Phytochemistry. 67:610-617
Zulu traditional health practitioners have claimed that the roots of Eriosema kraussianum N. E. Br. (Fabaceae) and other Eriosema species (Zulu indigenous umbrella name of "uBangalala") are effective remedies for the treatment of erectile dysfunction
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9a56bb32ec3e33238b9ad66265905c1b
https://doi.org/10.1016/j.phytochem.2005.11.019
https://doi.org/10.1016/j.phytochem.2005.11.019