Abstract

A selective process of formal [2 + 4]-cycloaddition of donor–acceptor cyclopropanes (2-arylcyclopropane-1,1-dicarboxylates) in the presence of GaCl3 to conjugated dienes to give cyclohex-3-ene-1,1-dicarboxylates has been developed. This process occurs by generation of 1,2-zwitterionic gallium complexes and involves the addition of a carbocationic center to a terminal diene atom followed by 1,6-cyclization to the allyl position of the resulting intermediate.

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