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In order to probe the ligand recognition sites of brassinosteroid (BR)-receptors, B-ring modified brassinolides (BLs), i.e. 6a-carbaBL ( 3 ), 6a-carba-B-homoBL ( 4 ), the C-5 epimers of compounds 3 and 4 ( 6 and 7 , respectively), and 6-deoxo-6a-oxo-6a-carbaBL ( 8 ), were prepared from...
Efficient synthesis of ( S )-(+)-lycoperdic acid has been achieved by use of the stereoselective hydroxylation of the enolate derived from the bicyclic lactam 3 with the molybdenum oxidizing reagent, MoOPH (MoO 5 ·Py·HMPA, oxodiperoxymolybdenum(pyridine)(hexamethylphosphoric triamide)), as a...
Easily accessible 2-substituted 4-aryl-5-methoxy- and 2-substituted 5-aryl-4-methoxypyridazin-3(2 H )-ones were transformed into the corresponding aryl-hydroxypyridazin-3(2 H )-ones by alkaline hydrolysis. The use of these compounds in the synthesis of 2-substituted 4,5-diarylpyridazin-3(2 H...
The synthesis of 11-methyl-3-oxa-tricyclo(188.8.131.52 1,5 )undecenones and their photochemical reactions upon triplet ( 3 T) and singlet ( 1 S) excitation is described. Oxidation of hydroxymethylphenol gave a ketoepoxide by intramolecular cycloaddition. Manipulation of the oxirane ring furnished the...
The mono-potassium salts obtained by the action of K 2 CO 3 on calix(4)arene and p - tert -butylcalix(4)arene are found to possess very similar solid-state dimer structures that differ only in the presence of a cation–π interaction in the former. The mono-potassium salt obtained by the action...
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