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A practical, brief and selective synthesis of limonoid CDE fragments from a readily available starting diketone is described. The key step is a cationic electrocyclization promoted by strong acids. In general the methodology has been demonstrated for compounds with sensitive furane and thiophene substituents to obtain diverse substituted indenones. Several of the compounds obtained show significant...
A new practical and stereoselective method for the synthesis of the model insect antifeedant CDE fragment of azadiradione and epoxyazadiradione, based on intramolecular insertion of α-aryl-α-diazoketones, has been developed. The procedure can be applied to complex systems. A short SAR study is reported
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