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Starting from 3-silylcyclopent-2-enone, a tandem conjugate addition-nucleophilicalkylation process was used to prepare the title compounds as well as allyl rethrone. 1,2-Dime-thoxyethane was found useful in the alkylation of the enolate intermediate whereas β-silyl group facil-itated the regeneration of C-C double bond.
1,2-Dimethoxyethane was found useful in the alkylation of the enolate intermediate when β- silyl group facil-itated the regeneration of CC double bond.