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A practical synthesis of biologically active 10-hydroxy- and 9-oxo-2E-decenoic acids, components of mandibular gland secretion of honeybee ( Apis mellifera L.), is developed using ozonolysis-reduction of oleic acid and 1,9-diacetoxynon-1-ene in the key steps.
The amino-acid composition of active symbiotic nitrogen-fixing Sinorhizobium meliloti in addition to the biomass and roots of Medicago sativa after inoculation was studied. The bacterium contains in its cells and releases to the substrate 13-16 free amino acids. The greatest amount of free amino...
β-O-Glycosides of N-acetylglucosamine with substituted 7-hydroxychromones and 7-hydroxycoumarins as the aglycones are synthesized. The phenyl hydroxyls are O-glycosylated in a solid-liquid system with crown-ether catalysts. The structures of the chromone and coumarin N-acetylglucosaminides and...
The known compound oleanolic acid (1) and a new cycloartane glycoside cyclounifolioside A (2), which has the structure 6,16-di-O-acetyl-24R-cycloartan-β6α,16β,24,25-pentaol 3-O-β-D-glucopyranoside, were isolated from Astragalus unifoliolatus Bunge. The structures of the isolated compounds...
Sulfamides were synthesized via the reaction of cytisine with 4′,4″(5″)-dibenzo-18-crown-6-disulfonyl-, 4′-sec-butyl-4′(5″)-dibenzo-18-crown-6-sulfonyl-, and 4′-acetyl-4′(5″)-dibenzo-18-crown-6-sulfonylchlorides. The structures of the prepared compounds were confirmed by PMR.
The toxicity of steroid benzoates 4-10 for Colorado beetle ( Leptinotarsa decemlineata Say.) larvae was studied by a contact-intestinal method. The most active growth and development regulator for this insect is 3β-benzoyloxy-5-hydroxy-Δ 7 -6-ketosteroid 9a.
Methods for allylic oxygenation of (+)-δ-cadinol by SeO 2 have been developed to study approaches to the formation of the eleutheside core from it. Diasteromeric alcohols and the product of their 1,4-oxacyclization, which is transformed into a bicyclic derivative containing the required...
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