The base-mediated reactions of 1,3-dicarbonyl compounds with bromoallenes used as an allyl dication equivalent were explored. The corresponding dimethyl methylenecyclopropane-1,1-dicarboxylates and 2,3,4-trisubstituted furans were efficiently synthesized. [reaction: see text]

This study demonstrates a facile synthesis of methylenecyclopropyl carboxylates and polysubstituted furans using bromoallenes as an allyl dication equivalent, providing a new approach for efficient synthesis of 1,3-dicarbonyl compounds.

Paper

Intermolecular tandem addition-cyclization of bromoallenes: a facile synthesis of methylenecyclopropyl carboxylates and polysubstituted furans.

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