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Stereoselective synthesis of 9α-hydroxylated ecdysteroids
Steroids, 2010Treatment of ecdysteroids with excess of TBAF in THF was shown to proceed with stereoselective oxidation at the 9alpha position of the carbon skeleton. The stereochemistry of the products was confirmed by X-ray analysis. Using this method, 9alpha-hydroxyecdysteroids were obtained in good yield.
Drach, S. +5 more
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1984
Helminths are medically and economically important parasites of many higher and lower animals. Several hundred million people, especially in countries of the third world, suffer from diseases caused by these parasites. Only a few representatives of the helminths will be mentioned here: the blood flukes, Schistosoma mansoni, S. haematobium, and S,
J. Koolman, J. Walter, H. Zahner
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Helminths are medically and economically important parasites of many higher and lower animals. Several hundred million people, especially in countries of the third world, suffer from diseases caused by these parasites. Only a few representatives of the helminths will be mentioned here: the blood flukes, Schistosoma mansoni, S. haematobium, and S,
J. Koolman, J. Walter, H. Zahner
openaire +1 more source
1984
The epidermal cells of most annelid worms secrete a cuticle which consists of a mixture of proteins and sugars. The Hirudinea have been reported, more than a century ago [1], to molt, a process which is less conspicuous in other annelid worms, although it is regularly observed in species like the polychaete Nereis divenicolor.
M. Porchet +4 more
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The epidermal cells of most annelid worms secrete a cuticle which consists of a mixture of proteins and sugars. The Hirudinea have been reported, more than a century ago [1], to molt, a process which is less conspicuous in other annelid worms, although it is regularly observed in species like the polychaete Nereis divenicolor.
M. Porchet +4 more
openaire +1 more source
1986
Ecdysteroids are a class of highly polar steroid hormones that regulate insect development; they are also called molting hormones. The first representative, ecdysone, was isolated in crystalline form more than 30 years ago by Butenandt and Karlson (1954) and its metabolism was studied (Karlson and Koolman 1973; Koolman et al. 1973, 1979).
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Ecdysteroids are a class of highly polar steroid hormones that regulate insect development; they are also called molting hormones. The first representative, ecdysone, was isolated in crystalline form more than 30 years ago by Butenandt and Karlson (1954) and its metabolism was studied (Karlson and Koolman 1973; Koolman et al. 1973, 1979).
openaire +1 more source