Results 151 to 160 of about 7,001,792 (210)

Synthesis of 20-hydroxyecdysone 25-acetate

Chemistry of Natural Compounds, 1997
A scheme has been developed for the selective conjugation of 20-hydroxyecdysone (20E) at the 25- position, with the synthesis of 20E 25-acetate as an example. The proposed scheme also permits the selective, synthesis of 20E 22-esters from both lower and higher fatty acids, which opens up prospects for the creation from them of drugs with a prolonged ...
N. K. Politova, V. V. Punegov, V. V. Volodin, A. V. Ignatov   +3 more
openaire   +1 more source

Regioselective synthesis of 20-hydroxyecdysone glycosides

Tetrahedron, 1994
Abstract Four β-D-glucopyranosides of 20-hydroxyecdysone (1) were prepared.
Jaroslav Píš, Jiří Hykl, Miloš Buděšinský, Juraj Harmatha   +3 more
openaire   +1 more source

Jones Oxidation of 20-Hydroxyecdysone (Crustecdysone)

Australian Journal of Chemistry, 1993
Oxidation of 20-hydroxyecdysone ( crustecdysone ) (4) with Jones reagent gives a 2:1 mixture of posterone (1) and its 3-keto derivative (2). A possible source of (2) is suggested.
QR Petersen, RC Cambie, GB Russell
openaire   +1 more source

Exposure to sublethal concentrations of tributyltin reduced survival, growth, and 20-hydroxyecdysone levels in a marine mysid.

Marine Environmental Research, 2018
Tributyltin (TBT) is as an antifouling organotin compound used in boat paints. Although organotin-based antifouling agents have been banned on a global scale, the mode of action of TBT has been studied in numerous aquatic species because of its toxicity,
Bo-Mi Kim, M. Saravanan, Do-Hee Lee, Jung-Hoon Kang, Moonkoo Kim, Jee-Hyun Jung, J. Rhee   +6 more
semanticscholar   +1 more source

Transformation of 20‐Hydroxyecdysone to Inokosterone (III)

ChemInform, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Rimma G. Savchenko, Ruslan V. Shafikov, Svetlana R. Afonkina, Viktor N. Odinokov   +3 more
openaire   +1 more source

20-hydroxyecdysone oximes and their rearrangement into lactams

Russian Journal of Organic Chemistry, 2009
(E)-Oximes derived from 20-hydroxyecdysone diacetonides and 7,8-dihydro analog were converted into the corresponding lactams (6-oxo-5a-aza-5a-homo derivatives) via Beckmann rearrangement. 14,15-Anhydro-20-hydroxyecdysone (Z)-oxime under analogous conditions (reaction with p-toluenesulfonyl chloride in acetone in the presence of Na2CO3) gave rise to 20 ...
R. V. Shafikov, Ya. R. Urazaeva, S. R. Afon’kina, R. G. Savchenko, L. M. Khalilov, V. N. Odinokov   +5 more
openaire   +1 more source

Synthesis of 20-hydroxyecdysone 6-chloronicotinates

Chemistry of Natural Compounds, 2009
New esters 2-5 that contain 6-chloropyridine groups characteristic of the alkaloid epibatidine were prepared by acylation of 20-hydroxyecdysone (1) by 6-chloronicotinoylchloride.
I. D. Bobaev, N. V. Kovganko, Yu. G. Chernov, Z. R. Utaeva, S. N. Sokolov, Zh. N. Kashkan, N. Sh. Ramazanov   +6 more
openaire   +1 more source

Synthesis of 20-Hydroxyecdysone Carboxylate Esters

Chemistry of Natural Compounds, 2017
Acylation of 20-hydroxy-2,3-O-isopropylideneecdysone (2) by carboxylic-acid anhydrides produced ecdysteroid derivatives containing various organic acids (5–12).
I. D. Bobaev, I. V. Zavarzin, A. N. Blinnikov, Kh. M. Bobakulov, N. Sh. Ramazanov, N. D. Abdullaev   +5 more
openaire   +1 more source

Preparation of 20-hydroxyecdysone-22-benzoate

Chemistry of Natural Compounds, 2004
Tashkent, fax (99871) 120 64 75; 2) Universite Rene Descartes, Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, France; 3) Universite Pierre et Marie Curie Endocrinologie Moleculaire et Evolution, France. Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 401-403, September-October, 2004. Original article submitted June 28,
N. Z. Mamadalieva, N. Sh. Ramazanov, J.-P. Girault, R. Lafont, Z. Saatov   +4 more
openaire   +1 more source

Ovarian Maturation in Stable Flies: Inhibition by 20-Hydroxyecdysone

Science, 1971
The steroid 20-hydroxyecdysone when given by mouth inhibits ovarian maturation in the stable fly, Stomoxys calcitrans (L.). by preventing lipid synthesis necessary for vitellogenesis in the developing oocyte.
J E, Wright, W F, Chamberlain, C C, Barrett   +2 more
openaire   +2 more sources